Question about 2004 GMC Envoy

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2004 GMC Envoy has trouble idling

My 2004 GMC Envoy has been having trouble idling and shut off at a stop light today. Now the check engine light is on. I had the thermostat and sensor replaced over a week ago. Any suggestions??

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  • donita_garza Jan 17, 2009

    where is the fuel filter on a 2004 GMC Envoy

  • Anonymous Mar 16, 2014

    how to replace instrument panel lights on 2007 gmc envoy

  • Anonymous Mar 27, 2014

    rough idle doesn't stall

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REPLACE THE O2 SENSOR THAT IS RIGHT ON THE MANIFOLD!!! THIS SAME PROBLEM HAUNTED ME FOR OVER 3 MONTHS!!! HUNDREDS OF DOLLARS LATER IT WAS A STUPID O2 SENSOR!!! THE SAD PART WAS... THE O2 SENSOR WAS STILL READING WITHIN SPECS ACCORDING TO GM .... BUT THEY PUT A NEW ONE IN AND IT HAS BEEN PERFECT EVERY SINCE.... FOR 9 MONTHS NOW!!! LET ME KNOW... RLM_75@YAHOO.COM

Posted on Feb 07, 2009

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A common cause for stalling at idle is a "throttlebody" plugged with carbon. A simple De-Carbon service that cleans the carbon from the throttle plate and the IAC valve will almost always cure this condition. The check engine light will also give a clue to the system that is having a problem. Just because the code may be fora particular sensor, does not mean that sensor is bad. Sensor readings effect other systems in the truck. Suggest getting the codes read from the computer, and asking an exert here.......
http://www.greatautohelp.com

Posted on Oct 23, 2008

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Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.

Posted on Aug 06, 2008

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Where,exactly, is the idle air control valve on a 2004 envoy located
It should be mounted on the side of the throttle body. But if it is bad you should also have a check engine light on and a stored trouble code for the valve.

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2005 gmc envoy engine shuts off
I have a '05 Envoy, 65k miles.
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My 2004 gmc envoy starts but shut off after 1 or 2 seconds
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Code P0121 on 2006 GMC Envoy Denali Check eng. light on. Is starting to cut off when at stop idling. Checked wires to the TPS and look fine. Thinking about cleaning Throttle body next. Need advice.
Cleaning the throttle body is certainly the right thing to try first. Make sure you clean the throttle plate as well.

Nov 11, 2010 | 2006 GMC Envoy Denali

1 Answer

Code P0121 on 2006 GMC Envoy Denali Check eng. light on. Is starting to cut off when at stop idling. Checked wires to the TPS and look fine. Thinking about cleaning Throttle body next. Need advice.
Classic signs of idle air control not able to cope with sudden engine loads. Cleaning should resolve this. Remove ducting from air cleaner to throttle entrance. Spray with carb. choke cleaner or WD40 spray and wipe back to the alloy finish. clean the the throttle plate and push the throttle open with your fingers and clean in behind as best you can. Clean the passageways to the idle air control valve. Remove the valve and give it a thorough clean up. Reassemble and it should all be good.

Nov 11, 2010 | 2006 GMC Envoy Denali

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I live in AB Canada and it was about 10 below zero Celcius today. I put the unit in AWD because it was really icy and was driving around town shopping for about an hour. Suddenly, all the dash warning...
you need to have your gmc computer checked for codes ,since the light is now off,they will have to check history codes for what caused it

Dec 02, 2009 | 2004 GMC Envoy

2 Answers

2004 GMC Envoy Idling high
sounds like the throttle plate is stuck try cleaning is out do not push on the throttle plate will damage it. have some one sit in the vehicle with their foot on the pedal take a tooth brush and some carb cleaner clean both side of the plate and inside the housing the best you can and see if the stops it.

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2004 Envoy xl stalls when making turns
this is caused by slow engine idle speed, do the procedure below.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, 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.



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