Question about 2002 GMC Envoy

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Engine idle to high. how do i turn it down 2002 envoy

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The idle speed on this engine is computer controlled and there isn't a way to manually control it or adjust it. If it is idling too fast usually it's due to a vacuum leak or other problem that over powers the computers ability to lower the idle speed to what it was programed to idle at. If the check engine light is on It may provide a service code and some clues as to why it is idling too fast. Hope this helps you sort out what is happening and good luck!

Posted on Jul 08, 2010

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The idle is not adjustable on this vehicle, it's computer controlled.. sounds like a large vacume leak. open the hood and listen for a loud hissing noise.. check the pcv hose, they tend to come off.

Posted on Jul 08, 2010

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Related Questions:

1 Answer

Why does my2004 gmc envoy xl slt idle high at startup?


This is normal. All vehicles idle high at start up to get the engine to operating temperature. This is known as open loop. The computer ignores signals from O2 sensors to keep your engine running safely. Once it has warmed up, it will enter closed loop, and you will see a decrease in idle.

Jul 05, 2014 | 2004 GMC Envoy XL

1 Answer

Finding the idle goes up n down/die out when using Defrost


Sounds like a vacuum problem. Do you have a seemingly hard brake pedal? If you do chances are your brake booster is leaking vacuum. If not check your vacuum lines. Your heater system is controlled by vacuum.

Feb 22, 2013 | 2002 GMC Envoy

1 Answer

2002 GMC Envoy idle goes low when AC is turned on


There is usually an idle solenoid on the throttle body that is designed to bump up the idle when the A/C is switched on, this could be bad, or out of adjustment.

Jul 10, 2012 | 2002 GMC Envoy

1 Answer

2002 GMC envoy slt 4.2 v6 My question is.. I recently changed the water pump on my wife's envoy. After replacing it the car idles low and high, low and high constantly. No normal idle like before. I...


Sounds like you may have disconnected the battery. Does the rough idle only happen when the defroster or A/C is on? If so clean your throttle body with throttle body cleaner with the battery disconnected. When finished, drive it for 5 or so miles with the defroster / AC off to let the computer relearn the settings. This will solve your problem.

Dec 21, 2010 | 2002 GMC Envoy

1 Answer

When starting engine has a very high idle


THROTTLE PLATE THROTTLE SHAFT OR LINKAGE IS DAMAGED OR STICKING.THE IDLE AIR CONTROL VALVE IS DAMAGED OR FAILED.CHECK FOR VACUUM LEAKS AROUND THE THROTTLE BODY GASKET AND CHECK FOR LOOSE BOLTS ON THE THROTTLE BODY UNIT.

May 19, 2010 | 2002 GMC Envoy

1 Answer

Changed battery in 02 envoy, now does not idle right


U have lost the adaptive computer idle learning, do the fllowing and drive it a few days it will clear up.



Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Feb 21, 2010 | 2002 GMC Envoy

1 Answer

I just changed the batter in a 2002 envoy and now it wont stay running if i let off the gas please help


Try resetting the ECM, turn the ignition key to the on position "engine not running" and pull the fuse to the ECM and place it back in. Leave the keys in that position for 30 seconds and then turn it off and on again for 5 seconds and start. this will reset the ECM to default. It may stall again but let it, just start it again and let idle for 3min and go foe a test drive. This should reset the way the engine and transmission performance, and should reset the idle issue on your Envoy. Good luck and keep me posted.

Jan 12, 2010 | 2002 GMC Envoy

2 Answers

Rough idle


sound slike you may have unplugged or disconnected somethine else or the spark plug you put in is bad or inpropper gap

Sep 03, 2009 | 2002 GMC Envoy

1 Answer

2002 ENVOY


I'd concentrate on IAC (idle air control,)motor, or AIS (automatic idle speed) motor. I believe on your vehicle, it's probably referred to as IAC motor, but either way, same thing, they control your idle during load conditions such as your experiencing. Have had good luck just removing it & cleaning the pintle on it & port (hole) that it comes out of with throttle body cleaner spray. If it cures it for a while, then starts to act up again, replace it. Should be mounted at front/side area of throttle body. be careful not to damage, or lose, "O'" ring at the base of where it mounts to throttle body. If you look the part up online at autozone, or pep boys, you'll know what to look for if not familiar with it.

Mar 09, 2009 | 2002 GMC Envoy

2 Answers

Rough idle only when engine is cold


check to see if the vehicle has EGR valve most of them are either elecrtronic or vacum controlled disconnect it and start it check and see if this smoothes out cause it sounds like the valve is staying open while the engine is cold if thsi solves the problem replace the valve.

secondly take a small screw driver aor a tiny hammer and tap the valve while the engine is running if it smoothes out replace the valve the valve is carbon filled and needs to be changed .

Oct 19, 2008 | 2002 GMC Envoy

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