Sbc Idles Up And Down

Yeah but I. I cleaned the throttle body and now it wants to idle high about 2000 rpm till it warms up and then 1000 rpm and come down slowly to about 600 rpm and idle steady. Once you have matched both carburetors you will need to set the idle to the desired idle speed setting. it also seems the longer i sit the worst it gets. Replaced wires, plugs, distributor cap/rotor, tps, ignition module, map, IAC, engine coolant temp sensor, rebuilt fuel pressure regulator and new alternator. The only thing I messed up is I lost the IAC to throttle body bolt and since it was a dealer part I will have to pick one of those up for $6. Starting out this morning was great. If your idle is somewhat shaky, throttle plate is out of adjustment or you have a lazy idle air motor the idle can drop enough to stall it. The engone was rebuilt by a high performance engine shop about 5 years ago. Idle runs about 700rpms and occasionaly will bog down and stall. Runs at idle for a few seconds then idles way down and if you push the gas it dies and it has 55 psi fuel. We are the manufacturer and innovator that created the Crower name brand. Okay, folks. costs very from dealership to dealership but should be anywhere from 50-100. The racing up and down at idle is call enging loping, usually caused by a vacuum leak. When cold, modern EFI engines are designed to idle higher, until the engine warms to operating temperature. I think it is the guage but am not sure, do not want to mess the engine up. 3L V6 Rough Idle. but maybe the engine needs an idle speed adjustment. Quick Tip-Throttle Cleaning. I have a 02 chevy malibu when u first start it it idles high for about 2 mins and idles down then when it gets to the right idle and the temp is 1/4 way warm it surges it idles up and down for about a min. I thought I was careful when installing- but the end result was High idle, really High idle. With all new gaskets, Jennings installed the Q-jet on his V-8 Chevy dyno engine to make final external air/fuel mixture and idle-speed adjustments. It idles at 600-700 rpm and will drop to 400 rpm and jump back and forth and then when the air conditioning compressor comes on it will drop to 300-500 rpm and keep cycling the compressor on and off. the engine is a small block 350 out of a 80 chevy pick up truck. It worked fine earlier in. If I blip the throttle it jumps up to about 20" on the way back down to idle (very briefly). 2003 Chevy TrailBlazer Idle goes up & down when AC turned on Sign In 2003 Chevy Trailblazer, 4. You should not be showing 0% tps at idle. The check valve in hose from intake manifold to booster has an arrow on it indicating the direction of installation Take it out of the line and suck on it to see it opens and shuts correctly. Going to heavier weight oil will give you higher oil pressure at the gauge, but it will also slow down flow rates at critical lubrication points. when the ac is turned on the idle fluctuates between 1000 rpm and trying to stall and then of course stalls. It revs up a little by itself and the idle speed never drops under 1000 rpm. Things that are fixed is idle, start up and no more bogging down sputters in all gears, I thought it was also backfiring just a little between shifts I ran the tank low and filled it with 15 gallons of premium before I ran it today. DO NOT OVER REV either!. I replaced a gunked up air filter. I have a 2004 5 cyl Colorado that starts and run fine but after short warm up perdiod when I come to a stop the idle drops down and is rough for a few seconds then comes back up and is fine. It is a small block motor found in Chevrolet coupes. When driving down the road the rpms jump up and down but the engine misses sometimes and almost dyes but fires back up and jerks because the excess gas. So I ain't too worried about that. Check the engine idle speed, both base and ECM controlled. Q: I have a 2006 Chevy Cobalt LS, 2. Starts great when cold. Sometimes it clears out immediately or a few seconds later. It is a small block motor found in Chevrolet coupes. hope this helps. This improves the throttle control and quietens it down, but that ridge will carbon up in the idle area and cause all kinds of idle issues. [Book] Suzuki Swift 1991 Manual - icdovidiocb. Once it's started, I have to tap the pedal a little to keep it from dying, then it'll go into high idle. Once it warms up runs great and does not do this in warm weather. But a low or weak battery is the #1 cause of idle stumble and stall, or a start and immediately stalls upon idle down. Full engine tune up , with fuel injection cleaning. Remember the QJet was lean EVERYWHERE in its calibration and that includes the off idle circuits! Alright. 20th Avenue, Wausau, WI 54401; Sales 715-675-7775; Service 715-675-4699; Parts 715-675-7775. I have a 2008 GLI manual. You may need to let the engine run for a few minutes in order for it to come down to its normal idle speed. I checked the throttle assembly + spring at idle and it's not moving. Recently it was idling rough and I read that cleaning the. You then observe your. Hi All, I have 2014 Cruze Equip (auto transmission) Australian model. When it starts acting up, the rpms will drop to about 500 or less, my accessories will dim, and the car will lurch and shudder as if it's running out of gas and is about to die. Even a slight carbon build-up can cause an extreme vacuum leak internally to the EGR Valve. The good news is that your problem could only be one of a few things; the bad news is that the faults involved could have several causes, and you'll need to track the problem down before you can fix it. 7 Idle surging,stalling in the alt. When I get off the Interstate and come to the stoplight, it starts idling very high. Going to heavier weight oil will give you higher oil pressure at the gauge, but it will also slow down flow rates at critical lubrication points. This eliminates the closed-throttle switch. But any time I just mash the pedal, at any speed or in neutral, it stumbles for half a sec and then takes off. Find many great new & used options and get the best deals for NEW FUEL INJECTION IDLE AIR CONTROL VALVE FIT CHEVY GMC HUMMER at the best online prices at eBay! Free shipping for many products!. This is not unusual and yet as you can see, the. Seems I should have rebuilt the 235 and not let the old man talk me into the small block!!!!!. Found out that it was a bad gasket between the t. Even hot and humid days. Hook up a pressure guage and see if the pressure drops below 55psi during the stall. The Size of the engine can be in Cubic Inches or Cubic Centimeters. I took it to a mechanic but the problem never went away and I was hoping I could do it myself. The timing mark should advance smoothly beyond the pointer. If the idle is high but uneven then you probably have a vacuum leak - find it making sure to include the intake manifold in your checking. It's going to be hard to really explain what my '02 5 speed blazer is doing but i'll try to do my best. Found out that it was a bad gasket between the t. ? Carb needs curb idle adjusted or rebuild. no engine light comes on just goes from 300 to 1100 rpm in park levels off ocassionally. Posted by 2 days ago. I have a 1992 chevy caprice it has a 350 TBI in it. I've replaced the MAF sensor and the fuel filter recently. it runs fine when i first start it, but soon idles low/rough, but only in gear. I have spent almost $1000. When driving down the road the rpms jump up and down but the engine misses sometimes and almost dyes but fires back up and jerks because the excess gas. OK, another question! This one is about a 402 big block. 03-21-2004, 10:00 PM. Upon cold startup, it'll run anywhere from around 1200 up to around 1900 at idle, in park. If the engine is warm - upon start up it starts hunting for idle and the RPM's will go up and down for a few seconds before it finds idle. The next mod will richen ALL the idle circuits up quite a bit- BOTH the curb idle and the off-idle circuits. Shop a wide selection of Silverado IAC valve at your local AutoZone. As far as idling, does it idle erratically (like it's going to shut off but doesn't) or just a normal up and down idle? Maybe you need to throw some fuel injection cleaner in the tank and get the injectors cleaned, over time they build up smudge. Today, 3:47pm. The throttlebody has been. The stock number for this INFINITI QX30 is SA11459. I have a 1995 chevy p30 18' box truck with a 7. In 2017 the plant made about 180,000 cars, down from 248,000 in 2013. Hook up a pressure guage and see if the pressure drops below 55psi during the stall. Excessive build-up of debris, dirt and carbon in your idle air control valve for Chevy S-10 hinders the amount of air going through the valve. Discuss 1990 TBI 5. Problem: My Motor Hesitates, Backfires, And Won't Hold A Steady Idle. In a lot of Mazda and Ford’s the fluctuating idle will actually come from a bad O2 sensor or MAF not the IAC. But with them on, it stalls about half the time, but only when it tries to drop down to idle. here is yet another Temp problem! I have a 67, 327, brand new 3 core aluminum radiator with electric fan. when the car is in motion there is no problem even on the hottest day. Sometimes the car will die all together and then I have to put my foot all the way down on the gas peddle to get it to start again. when driving the car it runs fine but at idle it revs up and down till it stalls. And finally, you can adjust the throttle stop (loosen the throttle stop lock nut) until you hear the Throttle Position Switch click. If you start it up and drive, it chugs, sputters, backfires, you can push the gas pedal to the floor and it does no good. Then I come along and retune it correctly and advance the timing to 22* and idle it down to 1000 RPM, when I moved the idle timing up it also moved the timing up on the other end so now at 2500 RPM your max timing is now 48*look out a melt down is about to occur. please i. Changed idle air control valve Car still idles up and down, while sitting in park or in drive. Now I’m hoping it won’t do it in the morning. Discuss 1990 TBI 5. It's marginally better when setting IDLE AFR to 13. 7liter 350 engine, i replaced the motor,the other motor had 225,000plus miles. I have a 2001 Chevy Metro. But any time I just mash the pedal, at any speed or in neutral, it stumbles for half a sec and then takes off. Hello, i have an 6. This has been over a two week period. Vehicle: 2000 Jeep Cherokee Sport, 4. Also had the heads redone along with making sure the intake surfaces were true. 05 gmc canyon. its gotten a lot worse. rough idle problem on 350 chevy back in August. The mixture in this cylinder is ignited by the spark plug, forcing that piston down, and with assistance from the. Electronic throttle systems are very common to this. It's going to be hard to really explain what my '02 5 speed blazer is doing but i'll try to do my best. Start the engine and adjust the idle adjustment screw to bring the idle back down but, leave it a little high (around 1000 RPM). As soon as the engine starts and a vacuum is produced, the vacuum advance mechanism advances the spark. My 2001 Chevy Astro van idles and vibrates rough when braking to come to a stop, and while stopped (in gear). The throttle body is cleaned, been tuned up (new A/C Delco (iridium) plugs and wires), fuel pressure regulator replaced due to seepage, and fuel filter replaced. 050" roller camshaft. Will start right up and idle around 950 and will occasionaly rise to about 1400 and go back down to 950 (In park/neutral) When in D or R, will idle rough idle in gear (Chevy) Help. found out after weeks of work stalling and no idle after warm up was caused by partly bad egr valve and 02 sensor egr let some air by to keep engine running when cold and o2 sensor would. I noticed while sitting in park the voltage meter drops and the engine pulls way down. When cold, modern EFI engines are designed to idle higher, until the engine warms to operating temperature. The old one was just 2 years old. The problem is sporadic and not consistent, yet it seems to get worse in wet weather. 0 that is starting to idle rough. I have researched this on here for a while and have tried many of the ideas recommended. 1 For access to the idle stop screw, pierce the cap with an awl and carefully pry the cap from the side of the throttle body. Schedule a test drive of the Used 2017 INFINITI QX30 FWD at Hendrick Chevrolet Cary in Cary. This is a very common problem, your best bet is to remove the entire AIV box (located behind the airbox on the drivers side) via the 3 screws holding it in place, then. This will enable you to set primary idle circuit. Have new install Terminator. 91 chevy 350 TBI dies at idle Sign In I have a 91 chevy 350 TBI 252,000 miles, motor and trans were rebuilt at 204,000 back in 02. 94 S10 blazer with 4. Starts and runs great but, when it warms up setting in drive with foot on brake, the engine surges. JUST GOT A NEW BATTERY. When the at the normal 1,000 rpm idle its never steady. If the air is on it seems to be worse. rough idle problem on 350 chevy back in August. This would allow the engine to idle, but was pushing the engine toward higher RPMS where it was happier. 94 S10 blazer with 4. just found this out the other day, you think dodge would. That happens when there's a problem with your Chevrolet Silverado idle air control valve. Quick Tip-Throttle Cleaning. DIY Home and Auto Recommended for you. I have achevy 2500hd that use to idle at about450 -500 rpm and would stall sometimes now after I tuned it up plugs and wires it stalls worse runs strong no missing can't cross wires Was told possible throttle body unit goes and causes low rpm. Chevy Dude Recommended for you. 1 For access to the idle stop screw, pierce the cap with an awl and carefully pry the cap from the side of the throttle body. i just had to replace a purge valve, cleaned the throttle body, and replaced the 6th cylinder. 0015" feeler gauge between the throttle body and throttle valve, then adjust the screw until the throttle valve just pinches the feeler gauge. It starts hard about 80 to 90% of the time when warm. Simply push up or down in 50 RPM increments from 750rpm to 1000 rpm. Mine is modified so my idle rpm may be higher than yours but the % is still relative. 7l idles up and down and somtimes when im driving the check engine light comes on and it runs poorly why. another update i just drove like 30 miles when i came back idle was back up to 2 grand. And when i give it good shots of gas its almost as if the throttle sticks for 2-3 seconds. 1300 rpm's!! The curb idle screw is backed out as much as possible and the linkage cannot go any further forward. 6L Duramax Diesel 2500 & 3500 series trucks. Check your distributer advance, if you have a timing light fire it on the pointer while the engine is idling, bring revs up to 2000 rpm or so. Save Share. The throttle body bore and plate should be cleaned with a carbon cleaner spray. So here is what's going on and if anyone has had the same issue and it has been resolved I would love to know what you did. This would allow the engine to idle, but was pushing the engine toward higher RPMS where it was happier. I have a 1997 chevy ck1500 5. Re: high idle with tbi 350 08-23-06 06:35 PM - Post# 989935 In response to bowtie-badboy well i tryed the reset thing and i dont think it worked cause i herd no sounds. It starts hard about 80 to 90% of the time when warm. and i put it in gear it starts to idle up and down some times it dies starts back up fine. The engine starts willingly and has power but idles rough. Once it warms up runs great and does not do this in warm weather. This has been over a two week period. The issue I am having now is that only at idle the engine revs up and down at a constant pace from about 3000 rpm to about 1200 rpm. Take a small screwdriver and start turning one bleeder screw on one side of the carb inward until the idle either drops or rises. I have replaced the TPS , tuned it up , replaced fuel filter, and cleaned out the EGR. 3L V6 Rough Idle within the Automotive Support forums, part of the Tech Support Forum category. 1 For access to the idle stop screw, pierce the cap with an awl and carefully pry the cap from the side of the throttle body. In 2017 the plant made about 180,000 cars, down from 248,000 in 2013. Try resetting the uefi and retry the overclock start off with a slight undervold and work your way up. Is their a cold air or cold coolant temp sensor that is giving bad readings when. When I let off the throttle, the vacuum jumps up to 25' and then back down to 13" at idle again. Known to be an internal combustion engine, it has 8 cylinders to carry out both power and performance. So my temp gauge fluctuates weather I'm in drive or in idle. None of these are particularly difficult to find, and you don't even necessarily need a multimeter to find. Start the motor and warm-up gently exactly as before. ? Carb needs curb idle adjusted or rebuild. To establish the correct advance curve, the vacuum advance and mechanical advance in the distributor must work properly with no binding. idles smooth, engine accelarets up to 1500 to 2000 rpm when put in drive or reverse. If you sit at a light for more than a few moments it will start to idle lower and lower until it stalls. Sometimes the problem is caused by a gummed up or sticking idle air control valve (IAC) or. MAY MPH HAVE BEEN UP AND DOWN AND NOW MY CAR IS STARTING TO PULL. It idles terribly. It has a slight surge, almost like it wants to idle back down, but then kicks up again. s, I replaced the throttle. I have the idle set at 850 RPM. 7: while driving truck it started bucking, rpms rapidly going up and down. I have a 2012 Malibu ltz 3. Check the EGR operation - there should be NO EGR at idle. Mine idles what i call high but that is probably the way it came and is supposed to act. My engine is a modified Chevy 350 with ported double hump heads, roller lifters and lots of more performance stuff. If it's eratic theres your problem. When i stop, the truck will want to push me through the stop. It is a small block motor found in Chevrolet coupes. The throttle body bore and plate should be cleaned with a carbon cleaner spray. 5l diesel for a 98 Dually ext cab 6. Think I got some bad fuel which began the problem, put additive in tank. You've probably got a vacuum leak under your throttle body. 175 hp outboard boat hydraulics, trim tab, bow down + more info 175 hp outboard boat start up, idle and off. The idle will rev up and down. If i remember correctly, it was not seated very well when I took it off. 2000 Chevy blazer (s-10) 4 by 4. I have a 2004 5 cyl Colorado that starts and run fine but after short warm up perdiod when I come to a stop the idle drops down and is rough for a few seconds then comes back up and is fine. DIY Home and Auto Recommended for you. My car is a 2003 Chevy Tracker with the 2. When i stop, the truck will want to push me through the stop. Once you have matched both carburetors you will need to set the idle to the desired idle speed setting. Engine Revving Up and Down at Idle FIXED - Duration: 12:31. This slows down the response time of the valve, which increases the chances of engine stall when the engine is idle. Wow, I got on to a good Honda mechanic, I told him the problem, Civic 01, overheat at idle and normal under driving conditions, he immediately said " electrical idle control module ", I would not know, but I think this guy is good, he says just get a second hand, it is rare that this happens, and a second hand mod usually fixes the problem for. I've had to local garage and dealer and they tell me they can find nothing wrong. When i take off it suptters but do does backfire. Now there is a gray flexhose that is running from the air filter housing down to the exhaust manifold. Fast orslow it ddoesn't matter. When you first start the truck whether it is hot or cold it idles up and down and will clear out instantly without notice. When driving down the street the car randomly started stalling when the RPM's go under 1000. Rpm's stay up even after the choke is open. But any time I just mash the pedal, at any speed or in neutral, it stumbles for half a sec and then takes off. I have a 02 trailblazer my wife drives. 4L high idle: Sign In I've got a 2002 Chevy Impala with a 3. my s10 has for the last year or so been high idling at about 1500 rpm's after moving in a manual transmission 97 it idles high when in and out of gear. This improves the throttle control and quietens it down, but that ridge will carbon up in the idle area and cause all kinds of idle issues. thhen in idle state it just idles up and down. 94 chevy truck revs up and down from 800 to 1200 in idle. Have replaced fuel regulator, throttle positioning sensor, and air control, and have tuned it up. Discuss 1990 TBI 5. If the idle is high but uneven then you probably have a vacuum leak - find it making sure to include the intake manifold in your checking. Think Crower "Every part for Power" for all of your racing hard parts. The throttle body bore and plate should be cleaned with a carbon cleaner spray. I've had to local garage and dealer and they tell me they can find nothing wrong. The previous owner 'replaced' the Timing chain but I don't know if. I have a 1989 chevy c1500 350 tbi that when in park it idles up and down and no matter if its cold or hot it has no power untill the rpms pick up then takes off. Excessive build-up of debris, dirt and carbon in your idle air control valve for Chevy S-10 hinders the amount of air going through the valve. If i slow and go, the idle stays high, and I take off like a rabbit. or just die out. 20th Avenue, Wausau, WI 54401; Sales 715-675-7775; Service 715-675-4699; Parts 715-675-7775. But I will if that's the next step. 0 that is starting to idle rough. 1946 Chevy 1/2 ton pickup, stock. I've had to local garage and dealer and they tell me they can find nothing wrong. I've had it happen, seeming out of nowhere, And it doesnt take much at ALL to keep the needle from seating. the engine is a small block 350 out of a 80 chevy pick up truck. MAY MPH HAVE BEEN UP AND DOWN AND NOW MY CAR IS STARTING TO PULL. OK, say i'm rolling up to a stop light and just want to coast up to it so just bump the shifter into neutral and let off the gas. If the motor looks ok,then inspect the Idle air control valve. any body know why my 1990 chevy truch ss 454. Iac Sensor Location On 1996 Chevy 305 Q my chevy tahoe 4x4 has the 5 3 liter v 8 and it could be a fault with idle air control a failure in the ignition system or various types of fuel delivery problems to name a few The 90s were a pivotal time in world history and was no different you might have spent the year glued to the tv playing super mario 64 or perhaps you were busy campaigning for. the temp sending unit is for the guage, the coolant temp sensor is for the computer. here is yet another Temp problem! I have a 67, 327, brand new 3 core aluminum radiator with electric fan. I've changed the wires, plugs. My motor idles at 1700 rpms, I checked all the hoses, sprayed carb cleaner around the base of the throttle body to see if there was a leak, (I replaced the gasket about 1year ago) there was no change in the rpms. The rpms will jump up and down 500-900 rpm, but then when you put your foot in it she smooths out. It then jumps back up to about 750, but idles rough. Question: I start the engine, when a turn the air conditioner on the rpm dips or the engine shuts off. 7%, while sales of the full-size Chevy Impala, made at Oshawa and Hamtramck, were down 13. The throttle body is cleaned, been tuned up (new A/C Delco (iridium) plugs and wires), fuel pressure regulator replaced due to seepage, and fuel filter replaced. It does it all the time, AC or no, I can turn on car and it idles good, but after reving up, upon reving down it will have the low rev problem repeatly. It is erratic, replace the sensor. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. I have an idle problem. Then it'll idle good, sometimes if we let it idle that way in drive it'll just die. With normal normal driving it reads 400deg-F and when I come to a stop it will not read below 400 deg-F no matter how long it idles. I'm going to edit this with a screenshot from my EFI Live catalog at idle. Upon cold startup, it'll run anywhere from around 1200 up to around 1900 at idle, in park. My mustang would surge between 1200-2000 rpm when coasting above around 30mph in neutral and the check engine light came on for the IAC. Not sure what has/was done before the problem. I have a 1958 chevy chevy that I have restored. 0 engine (it's a late model 77 w/ 78 engine). Hook up a pressure guage and see if the pressure drops below 55psi during the stall. When I first start the car, the idle only goes to 800 rpm. heres the problem. About a month ago, I started my car and it had a really rough. No power loss, just hesitation. It was fluctuating between 800-1200rpm. Idle goes up, goes down, gets rough. My setup is the PCV in the passenger valve cover and a K&N oil breather/filter in the driver's side valve cover. If the motor looks ok,then inspect the Idle air control valve. It starts up quickly and runs perfectly off idle. Engine Revving Up and Down at Idle FIXED - Duration: 12:31. I pulled up to a stop sign and my car stalled. 1989 Chevy Camaro Runs Bad Idles Rough and Dies. till it warms up then runs fine. When it started, I would turn the key and the car would almost, but not quite, start, and simply turning it off and trying again would work immediately. It's going to be hard to really explain what my '02 5 speed blazer is doing but i'll try to do my best. after cleaning throttle body with cleaner is when it started d … read more. The load of the compressor causes the idle to come down and overshoot after then back down, causing the problem you describe. 5l diesel for a 98 Dually ext cab 6. I have a 2005 Nissan Sentra with 74,000 miles on it, and it has had trouble starting for 2 or 3 years. I have 396. , other wise I just shut it off. my truck does something similar. I've had this car since 2015, and it has always had this problem. I did not have a chance to really let it warm up (it was cold and raining). I checked the throttle assembly + spring at idle and it's not moving. Engine won't idle lower than 800rpm without stalling. the tach read 0 yes zero and below, llights are dim and driving my tach reads normal untill i slow down the the problem reoccurs. If one got weak, it would surely cause a idle control problem, thus many inexperienced owners and mechanics would try to adjust the throttle blade angles via the linkage and that's when the headaches would start. 20th Avenue, Wausau, WI 54401; Sales 715-675-7775; Service 715-675-4699; Parts 715-675-7775. Up and down idle on start up. But still have a major issue. Do this to both throttle bodies. When the engine idles say for 20 or 30 minutes the water temperature will climb to 240 degrees or greater unless I start moving. If all the above check out, from there you need to take the next step, and hook up a scan tool and monitor two data pids: MAF frequency MAF grams/second On a 3. I have a 1997 chevy ck1500 5. I have spent almost $1000. 20 minutes roll by and it is still stuck at this high idle, I adjusted the idle mixture screws and even the screw that controls the carburetors idle speed when it is warm on the 1406 and it did absolutely. But after its been up to temp for a bit, if I stop and let it idle for 5 min. 91 Chevy K 1500 350 idle problem. Same on fuel - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. Hey guys, y'know, the usual situation here, first time poster requesting help on something but I've just been banging my. this form and especialy those who try to help!! when i start my truck it starts fine but revs up to maybe 15 rpm. After I shut off the car and then restart it after a few minutes, the idle speed would go back to normal. found out after weeks of work stalling and no idle after warm up was caused by partly bad egr valve and 02 sensor egr let some air by to keep engine running when cold and o2 sensor would. It does it all the time, AC or no, I can turn on car and it idles good, but after reving up, upon reving down it will have the low rev problem repeatly. 6L Duramax Diesel 2500 & 3500 series trucks. The old one was just 2 years old. To set the tps to the correct value at idle, you will need a digital voltmeter. I just bought a 1994 K2500 w/ 5. I have a 02 chevy malibu when u first start it it idles high for about 2 mins and idles down then when it gets to the right idle and the temp is 1/4 way warm it surges it idles up and down for about a min. over the past few weeks i have gone on little test drives, turning the timing up a little as seems ness. driving down the road it does fine, never sputters or struggles, but once i stop at a light it starts the rough idle. When I first start the car, the idle only goes to 800 rpm. DIY Home and Auto Recommended for you. After cleaning my throttle body on my 2008 chevy silverado 5. 7L, 104,800 miles. 3 with an EGT guage. The motor fails because of carbon buildup and has to be replaced, and the idle will get back to normal. It still surges at low speeds which was the purpose behind cleaning it in the first place The auttomatic idle module is nor workong. when i stop moving after about 10 seconds it will go back down to 500 and wont high idle when i start moving again. If driven immediately, on takeoff the vehicle hestitates heavily and then takes off. Also make sure your rods are fully sunk at idle. My chevy pick up 1996 silverrado automatic 350 5. When it is OK, the idle sits at just under 1k rpms, sometimes dropping to about 800-900. The old one was just 2 years old. When the engine idles say for 20 or 30 minutes the water temperature will climb to 240 degrees or greater unless I start moving. Simply push up or down in 50 RPM increments from 750rpm to 1000 rpm. it bogs down to 4 or 500 and bounces for a few seconds before smoothing out, i had an emissions code but it's since been fixed, i tried cleaning the MAF, it shakes like a jackhammer when coming to a stop, headlights dim, ac or heat dies down a bit and its really annoying, my CAI rattles off the front cross piece when this happens and it's really loud. Answer: Stalling with the A/C on at idle is usually caused by carbon build up in the throttle body. Small Block Chevy with mild hydraulic cam, Base map 5008 Idle Control Off = spark advance @ consistent 18 degrees and idles forever @1000 RPM Idle control On = advance spark fluctuating between 9 to 33 degrees and dies in less than 1 minute attempting to idle @ 1000 RPM Inside distributor : Hall effect sensor is tightly. While battery life performs better, adding a few hours to the talk time and plenty more standby hours, you lose constant connectivity. This is not unusual and yet as you can see, the. 2001-2005 Chevy/GM 6. when the ac is turned on the idle fluctuates between 1000 rpm and trying to stall and then of course stalls. It started right up! But it ran at a high idle, around 1500-2000 RPM. 5 through 2005 LLY 6. The Size of the engine can be in Cubic Inches or Cubic Centimeters. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. rough idle problem on 350 chevy Showing 1-8 of 8 messages. Valves in my Chevy 350 rattling under load, but not during idle. it seems to only idle with any consistency around 1400, and honestly it sounds more like 800 with the cam. I get in it and start off with no problems. When I turn the engine off, and then back on, it idles fine. See Rick Ehrenberg’s bolt-on performance tips. 9 Cummins, 9560 miles, Delo. The first place to go when attempting to lower the idle speed is the basic tune-up. any body know why my 1990 chevy truch ss 454. At idle they should be down, and not bouncing. It could also be caused by a sticking choke at the carb. Idle Air Control Valve and Throttle Conrtol Switch Open up the hood and look at all the wires, spark plugs, tubes, vacuum lines and valves. If they are up or you can push them down more manually then your rod springs are too heavy, lighten up with different springs. As soon as the engine starts and a vacuum is produced, the vacuum advance mechanism advances the spark. 7l idles up and down and somtimes when im driving the check engine light comes on and it runs poorly why. Raises idle to 1,200 or 1,800 RPM while in Park to cool or heat the interior more effectively. 7%, while sales of the full-size Chevy Impala, made at Oshawa and Hamtramck, were down 13. My pickup is acting up. I've had this car since 2015, and it has always had this problem. The idle does seem to search up and down some. Install a new CMP actuator solenoid valve and try to repeat the cold start idle surge condition. The engine also have a very aggressive camshaft (I don. I don't have a tach so I can't tell how high but it's revving pretty good. I later found that the starting issue was an inexpensive. Idle goes from the normal about 700 rpm up to about 1000 constantly. after cleaning throttle body with cleaner is when it started d … read more. When I let off the throttle, the vacuum jumps up to 25' and then back down to 13" at idle again. driving down the road it does fine, never sputters or struggles, but once i stop at a light it starts the rough idle. 5 Cruise 14. Make sure the firewall isnt causing an issue. could also. 94 chevy truck revs up and down from 800 to 1200 in idle. My engine has suddenly started idling high after it's warmed up. 8 Yesterday I set the throttle plates in drive with the foot on the brake. 01-29-2005, 08:46 PM. " Reply: "There is a service bulletin for that problem on your vehicle. a stuck float will cause the boosters to drip fuel into the intake at idle and run horribly rich. The Size of the engine can be in Cubic Inches or Cubic Centimeters. I am not sure why my 79 cj7 304 is idling high after being driven for a while. I'm new to Diesel's. Re: 87 Chevy 350 TBI low Idle issue I had the same problem you described many years ago with my 87 350 FI 4x4 and after two mechanics played with everything with no results, I took it over and left it at the GM tech school and they found that the distributor shaft had become demagnitized. 5-2 turns out on both screws. The rule of thumb is that you need to maintain 10 PSI of oil pressure per 1000 rpm on the engine. My dad's S-10 seems to run with lower oil pressure readings than the blazer, but I don't have much experience as to knowing what may be typical or abnormal. Discussion in 'The Hokey Ass Message Board' started by J-R, Aug 11, 2009. Access our free Throttle Body Injection (TBI) Repair Guide for Chevrolet Full Size Cars 1979-1989 through AutoZone Rewards. Ran perfect on the drive home. While i was driving my car was jerking back and forth while my rpm were dropping then jumping back up again. But with them on, it stalls about half the time, but only when it tries to drop down to idle. 6 automatic. 4L, 170,000 miles, I had 2 ignition coils go bad, replaced them both and then when I turned the AC on the idle drops so low that it stalls the engine are almost stalls. Hi i have a 2002 Trailblazer and my engine light is on. If the IACV output duty cycle (the length. Things that are fixed is idle, start up and no more bogging down sputters in all gears, I thought it was also backfiring just a little between shifts I ran the tank low and filled it with 15 gallons of premium before I ran it today. Rev needle is moving up and down by 50-100 rpm on idle (regardless of which gear selected. Runs at idle for a few seconds then idles way down and if you push the gas it dies and it has 55 psi fuel. Have replaced the pmd to a remote pmd(new). The special warranty coverage for this will only cover it if it pulls the right misfire code. I determined that with the PCV valve hooked up, my SBC 350 will not idle right, it just fluctautes up and down. If you aren’t connected and using the Bluetooth, it will shut down and enter deep sleep mode. I get in it and start off with no problems. At an idle the engine fluctuates 200 rpm and up to 4 degrees of timing at the crank. Idle Air Control Valve and Throttle Conrtol Switch Open up the hood and look at all the wires, spark plugs, tubes, vacuum lines and valves. That happens when there's a problem with your Chevrolet Silverado idle air control valve. I did not have a chance to really let it warm up (it was cold and raining). This "high idle’ condition is causing the Automatic Transmission to “slam” when put in gear. An example of an Idle Air Control (IAC) valve: Potential Symptoms. If you're experiencing a rough idle in an older vehicle with a carbureted engine, the process is a little different. If it does than you have a vaccuum leak behind the throttle plate. Most likely you'll notice the idle speed is higher than normal. Then tighten the lock nut. When you start the car from a cold start it'll idle in the low 800-900 rpms, rev up a few times into 1100-1200 then idle fine at 1000rpms. 00 trying to find the problem for this. This is a very common problem, your best bet is to remove the entire AIV box (located behind the airbox on the drivers side) via the 3 screws holding it in place, then. Engine Revving Up and Down at Idle FIXED - Duration: 12:31. 3 Vortec motor in it. I have an 88 c1500 with the 4. Also make sure your rods are fully sunk at idle. JUST GOT A NEW BATTERY. 1990 chevy truck 350 tbi runs rough at idle up and down and exhaust stinks bad, bad gas milage too - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. At Crower, performance is our business. when driving the car it runs fine but at idle it revs up and down till it stalls. hope this helps. chevy 350 high idle hi i have a chevy 350 in my 72 chevelle engine has been overhauled but the idle is too high like around 2000 to 3000. 3L V6 Rough Idle. Chevy Dude Recommended for you. But a low or weak battery is the #1 cause of idle stumble and stall, or a start and immediately stalls upon idle down. replaced all sensors, can't find any vac leaks. My setup is the PCV in the passenger valve cover and a K&N oil breather/filter in the driver's side valve cover. Iac Sensor Location On 1996 Chevy 305 Q my chevy tahoe 4x4 has the 5 3 liter v 8 and it could be a fault with idle air control a failure in the ignition system or various types of fuel delivery problems to name a few The 90s were a pivotal time in world history and was no different you might have spent the year glued to the tv playing super mario 64 or perhaps you were busy campaigning for. I noticed it goes up when I accelerate, then I let off to stay at a pace, and it goes back down sometimes and other times not. cant get to idle correctly. While battery life performs better, adding a few hours to the talk time and plenty more standby hours, you lose constant connectivity. Valves in my Chevy 350 rattling under load, but not during idle. There might be multiple neglected things, each of which contributes to rough idle/dying. It sounds like your throttle bodies are out of adjustment. My engine is a modified Chevy 350 with ported double hump heads, roller lifters and lots of more performance stuff. Wait a minute for the engine idle to level off, then use a pen and paper to write down the RPMs that your engine settles and idles at. If i slow and go, the idle stays high, and I take off like a rabbit. another update i just drove like 30 miles when i came back idle was back up to 2 grand. Posted by 2 days ago. Quick Tip-Throttle Cleaning. When the at the normal 1,000 rpm idle its never steady. This improves the throttle control and quietens it down, but that ridge will carbon up in the idle area and cause all kinds of idle issues. With the line removed and capped off it sounds great, no RPM fluctuations. A month before all this we put in a new battery, cat converter, o2 sensor. As stated for an automatic and the IAC Postion was about 8-9. If it is idling smooth you can turn the AC on and it starts reving up and down. 7 idle revs up and down high emissions Does not smoke ,changed plugs,wires,rotor,checked firing order,rebuilt tbi, injectors ? changed out with used- same problem. Chevy Engine Light Questions And Answers. Sometimes the car will die all together and then I have to put my foot all the way down on the gas peddle to get it to start again. Same on fuel - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. When I give it throttle, the vacuum goes up to about 21" and stays steady (held it at 1500, 2000, and 3000 rpm and it stays about 21"). My power brakes still work OK (always did) but according to one of my friends who put a timing light on the car the timing doesn't advance very well when you give it the gas; we put a vacuum pump on the vacuum advance and it took around 13' to move it. When I first start the car, the idle only goes to 800 rpm. I'm new to Diesel's. It also helps cure an off-idle "sag" common to heavily cammed motors with big-runner intake manifolds. We are the manufacturer and innovator that created the Crower name brand. It does it when Im coming to a stop. Discuss 91 chevy C2500 idle , low RPM problems in the alt. when i put it in park or nuetral it idle up but it still lopes. My mustang would surge between 1200-2000 rpm when coasting above around 30mph in neutral and the check engine light came on for the IAC. When one IAC went bad, it was best to replace them in pairs. There might be multiple neglected things, each of which contributes to rough idle/dying. The truck idle drops and lopes and occasionally completely stalls. Once it's in gear, the high idle continues and sometimes will not shift down into passing gear when going up a big hill. 1992 Chevy C1500 350 5. If it's not that try the EGR valve and take carburetor cleaner and spray some on there. these are the things i ran into on my s10. I cleaned the throttle body and now it wants to idle high about 2000 rpm till it warms up and then 1000 rpm and come down slowly to about 600 rpm and idle steady. (Ride to the bus stop) It seems to idle up then i have to give the pedal that pump to idle down. It's all fun and games until you drop an intake bolt washer down the distributer hole 122. Engine balanced, decked, blueprinted to specs. The load of the compressor causes the idle to come down and overshoot after then back down, causing the problem you describe. 4L, 170,000 miles, I had 2 ignition coils go bad, replaced them both and then when I turned the AC on the idle drops so low that it stalls the engine are almost stalls. 2 days ago my cel came on and had a rough idle right between 500-800rpm jumping up and down so i brought it in and had the guys check it out. Small Block Chevy with mild hydraulic cam, Base map 5008 Idle Control Off = spark advance @ consistent 18 degrees and idles forever @1000 RPM Idle control On = advance spark fluctuating between 9 to 33 degrees and dies in less than 1 minute attempting to idle @ 1000 RPM Inside distributor : Hall effect sensor is tightly. You can also use a progressive scan tool to view it’s range and operational parameters. " Reply: "There is a service bulletin for that problem on your vehicle. another update i just drove like 30 miles when i came back idle was back up to 2 grand. If you listen after it starts when cold you can hear the click of the compressor turning on followed by the up and down stumble. Unread post by Roy » Wed Apr 03, 2013 1:52 pm After cleaning carbon from the throttle body of my 2008 Chevy Silverado it seems to idle up and down, but it stays idling high after i give it a little gas then come to a stop. 2, but smells real rich & stinky exhaust. 93 Chevy pickup 4. Even a slight carbon build-up can cause an extreme vacuum leak internally to the EGR Valve. engine idles up and down 4 Answers. With the engine running take a look stright down the carb. Simply push up or down in 50 RPM increments from 750rpm to 1000 rpm. Chevy Truck Revs Up And Down By Itself How to repair Bad Idle Speed problem in car. thhen in idle state it just idles up and down. Engine will idle at 750 rpm after warm- up. I noticed it goes up when I accelerate, then I let off to stay at a pace, and it goes back down sometimes and other times not. It still surges at low speeds which was the purpose behind cleaning it in the first place The auttomatic idle module is nor workong. OK I work in SE New Mexico where its about 100° all day long. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. 2 days ago my cel came on and had a rough idle right between 500-800rpm jumping up and down so i brought it in and had the guys check it out. 20th Avenue, Wausau, WI 54401; Sales 715-675-7775; Service 715-675-4699; Parts 715-675-7775. The idle does seem to search up and down some. 1300 rpm's!! The curb idle screw is backed out as much as possible and the linkage cannot go any further forward. Once you have matched both carburetors you will need to set the idle to the desired idle speed setting. With the line removed and capped off it sounds great, no RPM fluctuations. What could it be?. I went to leave work today and started the car to leave. I tried to pull out vacuum hoses and see if it changes the idle, It does change abit (higher) then I put it back on and then it slightly goes down, but still 3000RPM and you can really smell the fuel. my concern is this. But a low or weak battery is the #1 cause of idle stumble and stall, or a start and immediately stalls upon idle down. These diagrams include: Fig. Chevy s10 pickup idles up and down almost stalls new fule pump filter injector assy new entire intake gasket set. Taking a vacuum reading from the large port at the back of the carb shows 9"-10" of vacuum on the gauge. I checked the fuel presser and it is fine. There is new fuel in it, and I replace the fuel filter at the carb, and also the in-line filter. " Reply: "There is a service bulletin for that problem on your vehicle. That happens when there's a problem with your Chevrolet Silverado idle air control valve. when i put it in park or nuetral it idle up but it still lopes. Access our free Throttle Body Injection (TBI) Repair Guide for Chevrolet Full Size Cars 1979-1989 through AutoZone Rewards. One troublesome spot would be the Idle Air Control motors (IAC). I have been dealing with a timing issue (I think anyway) for about 6 weeks now. It can also cause the engine to idle either too high or low. 0L, 6-cyl, 94K miles, 10W-30 oil (OEM spec) I've always used full synthetic oil in this vehicle, due to the sub-zero winters we have here in Minneapolis that turns non-synthetic oil into molasses. Okay, folks. Vehicle: 2000 Jeep Cherokee Sport, 4. One night I was picking up a load of wood and the logger had just fired up his newer dodge cummins for it to warm up. I sprayed carb cleaner around the base of the carb, and the idle goes up just a little when I spray between the carb and the intake on the drivers side. has a backfire sometimes through the intake. more air = more gas I guess. 3 with an EGT guage. 7 surging, rough idle,cutting out 02 problem Wicked Spray. The only thing I messed up is I lost the IAC to throttle body bolt and since it was a dealer part I will have to pick one of those up for $6. 6 months ago it started to die when I gave it gas. Typically, no DTCs will be stored but a P0300 and random misfires on all cylinders may occur if the concern lasts long. I just got it from the shop yesterday and didn't run it untill today. I'm going to edit this with a screenshot from my EFI Live catalog at idle. i have a 1995 silverado 5. Other likely causes are an extreemly dirty throttle body, or a malfunctioning. Do this to both throttle bodies. You can see how far out the plunger is from the new one, but its still doing the up / down idle. 7L, 104,800 miles. What would cause that? I have changed fuel filter, egr valve, IAC valve, TPS sensor, plugs, wires, cap, rotor, coil, rebuild TBI, and have tried adjust the timing with the distributor, but everything i do will not get rid of it. If you're experiencing a rough idle in an older vehicle with a carbureted engine, the process is a little different. Your idle speed should then be around 500-600 rpm. Exhaust is 2/12" rams horn with X-pipe crossover. MY SHOP IS BUT THEY - Answered by a verified Chevy Mechanic. At times, when I need power, (climbing, heavy acceleration,) it poops out - it sputters, hesitates and sometimes it even backfires. I have a 2004 5 cyl Colorado that starts and run fine but after short warm up perdiod when I come to a stop the idle drops down and is rough for a few seconds then comes back up and is fine.