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Chevy Suburban/Tahoe Rough Idle and Stalling

198 messages,  Last post on Feb 14, 2013 at 5:02 PM

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What is this discussion about? Chevrolet Suburban, Chevrolet Tahoe, Chevrolet Silverado 2500, Engine, SUV

    

Messages Page 1 of 20

#1 of 198 01 Chevy Suburban rough idle/stahling by navalavi8or

Jan 23, 2007 (10:02 am)

I have a 2001 Chevy Suburban 2500, 2WD w/ 6.0L engine. We purchased it from a Chevy dealership back in 2002. It was a GM buy-back, for the same reasons it's now having. NO DTC's, NO CEL.
  
Having a problem with stalling. It usually happens after backing out of parking areas when vehical returns to idle while shifting from reverse to drive. It then become difficult to restart. Also during this issue if vehical doesn't stall it starts exibiting erratic idle. The vehical also seems to idle low 550rpm down to 400 and lower on occasion.
  
I have attempted to locate the idle air valve but it doesn't seem to have one in the location in the manual (on throttle body by altinator). I can only find what I believe is the Throttle position sensor in that location.
  
Vehical doesn't do this all the time but nore times than not and seems to be more often during cool/cold weather.
  
Any help or idea would be gratly appreciated.
  
Curtis

#2 of 198 No Idle Air Control Valve on Throttle Body by docdan

Feb 03, 2007 (7:08 pm)

I have a "Late" 2001 Suburban LT 1500 2WD that stalls when you are slowly moving the vehicle. It most commonly occurs when pulling into a parking lot at idle speed. The vehicle runs great at speed and if you hold your foot lightly on the accelerator it will not die. It is simply that the Idle speed is too low. From what I had read I decided to replace the fuel pump module because it was whining but never quit pumping fuel. I ordered the pump to find that the 2001 module had different plugs than my vehicle had. It took many calls but I found a dealer that researched the problem to find a harness designed to rewire the module to fit my application. The pump did not fix the problem. The next step was to replace the Idle Air Control Valve. I ordered the part and when it came in I went to install it to find that the throttle body on my suburban did not have an IAC Valve on it (I have Pics). I climbed under the dash and put an adhesive spacer under the stop for the pedal and the problem is fixed for now. What is going with these vehicles? HELP!

#3 of 198 Re: No Idle Air Control Valve on Throttle Body [docdan] by navalavi8or

Feb 03, 2007 (7:43 pm)

Replying to: docdan (Feb 03, 2007 7:08 pm)
After alot of research and calling the chevy dealership that did all the work prior to and after the GM buy back we figured out the problem.
 
The Chevy 6.0L w/ electronic throttle (no cable) does not have a idle air control motor (valve). The electronic throttle motor and pcm control the idle. On models that have no idle air control motor there is a small machined opening on on the throttle body that prevents the throttle plate from completly closing. Ater what seems to be a realativly short period of time the back side of the throttle plate and intake will have a large amount of carbon and oil from the EGR and crank vent systems. I removed and cleand the throttle body and what I could of the intake where the TB mounts and it solved all my idle issues.
 
BTW I will have to give the Chevy parts manager a plug because he reviewed the work orders (from 2003) and found a mistake on the paper work. The mistake was fuel injectors where replaced which actually all that was done was that the throttle body was cleaned. Then he suggested what I did to remedy the problem. I would have changed uneeded parts with out his help.

#4 of 198 93 suburban slight miss by mark2241

Feb 11, 2007 (7:15 pm)

i have a 93 suburban with the 7.4 ltr engine.it has a miss
you can feel in gear stopped.i did a full tune up and changed the cat.i also replaced the fuel injectors.i think it might be a bad plug wire but at this point i give up,please help

#5 of 198 1999 7.4 Suburban long start rough idle by bessbrooke

Mar 07, 2007 (12:34 pm)

My 1999 454 7.4 liter suburban LT turns over several times when cold before spluttering into life ( it then nees a bit of gas) and Idles roughly. i think it may have a slight missfire. is this a common problem. I have replaced the oxy sensors, fuel pump and plugs n leads but it is still rough and vibrates like a bus. no problems restarting from hot though. ANY IDEAS?

#6 of 198 Re: 01 Chevy Suburban rough idle/stahling [navalavi8or] by gmlorraine

Mar 12, 2007 (8:02 am)

Replying to: navalavi8or (Jan 23, 2007 10:02 am)
I have a 2001 Chevy Suburban. It sounds like the same problems I was having. I replaced my intake manifold gasket it had cracks. Have it checked out for vacuum leaks. They can smoke the engine for leaks. The gasket is made of rubber. So when it is cold it contracts to normal. Which creates a vacuum leak. When the truck is warmed or hot the gasket expands. Have it checked for vacuum leaks in the morning after the truck has sat. don't test for vacuum leaks when car is hot. hope this works

#8 of 198 Engine dies when backing up or scootching forward by plaser

Mar 12, 2007 (1:31 am)

I've had this 1989 GMC Suburban for a couple of years. The engine was relplaced right after we bought the vehicle.The only parts that were not replaced by new parts were the distibuter,ignition modules or anything else on the throttle body. If I am not in gear I can lightly press on the accellerator(ACC) and it won't try to stall but if I put it in gear and try to do the same, like if I'm backing out of a stall or trying scootch foward a little it will try to die out. I have to throttle the accellerator peddle a little to keep it from dying. It started about a year ago and really hasn't gotten worse. Also if I was driving for like 40 minutes or so and I came to a stop on the freeway or something it would try to die out again and I would again throttle the ACC. After I did a really good tune up the stalling on the freeway deal went away but I'm still having issues. The truck doesn't give me any other issues, runs great otherwise and purrs like a kitten when idling. A couple mechanics couldn't find any codes and both said the timing was correct. Like I said it only does it when in gear. Any help would be greatly appreciated. At the very least a suggestion on where to start to replace something.I am also noticing when I try to start the truck it takes a little longer than it used to,it needs more turn over time then it starts up. Before I could just hit the ignition and it would fire right up, kinda like I lose fuel pressure in the line.

#10 of 198 93 Suburban Stalling at lights by fryall4

Mar 22, 2007 (11:35 am)

I have a 93 Chevy Suburban 4X4. 5.7, AT, A/C, all power. Problem is after warm up and stopping at a light the truck will stall. It starts up quickly and runs perfectly off idle. I have replaced the fuel filter, Idle air control valve, plugs, cap nd rotor with no solution. I have been researching and think the problem may be the Torque Converter Clutch lock up solenoid (TCC). There is a way to test this, but I don't know how. I don't have the $ to take it in, I just dropped $1400 on a blown up rear end. Does anyone else know how to test this solenoid on a 4L60E? Or maybe what the problem might be? Fry-

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