Question about 2002 GMC Envoy

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I just replace the battery in my 03 envoy. no the engin surges when its idling. any reason for this and how it can be fixed??

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As silly as this might sound, you more than likely disturbed a vacuum line or an electrical connector located near or under the battery. Check around for this and see what you find. If you removed the air intake duct make sure the clamps and connections are tight.

Posted on Feb 08, 2012

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Posted on Jan 02, 2017

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SOURCE: My 03 Envoy will not idle. Keeps shutting off...

Got a solution for you on this. There is a small sensor, called the MAP sensor.
It is located on the top of the engine. You will see a blue sticker with Delco Motors 5V GND written on it. Has a wiring harness that you can pry up and
pull off. Unplug the wiring harness and plug it back in. You may need to reset the code errors. I had mine at a mechanic, and he did that , reset the code errors and it solved the problem.

Posted on Oct 02, 2011

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SOURCE: 2003 Envoy 6 cylinder, Intermittent miss at idle ,

check egr system

Posted on Mar 15, 2010

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I have a 99 civic 4 door and the engine surges at idle


hot engine or cold, or both???????????????????
surging or hunting idle is complex but for sure the ECU has lost control of idle speed , there are 2 macro reasons, (vast causes)
1: ISC is stuck (in non SAE terms, the idle speed control valve ) is stuck.
2: engine is missing cause the ISC to GO NUTS trying to control
idle and can not.. the 50 reasons, , have list ask.
we do tests to find out if either or both the above are bad.
do you want tests, or guessing>???

Jan 22, 2014 | 1999 Honda Civic

1 Answer

Battery installed backwards at store


I would have this checked out to make sure they did not damage the computer, the check engine light may have been due to battery disconnect , the idle problem may be due to the same reason, it may need to relearn idle and other sensor inputs that were lost due to battery removal and fuse popping, this should take a day or two of driving it.
if you are still having a problem after that then have it checked.

Jun 09, 2013 | Toyota Cars & Trucks

1 Answer

When I am sitting at an idle, my lights flicker and I get power surges. Sometimes alternator doesn't charge. By racing the engine, it usually goes back to charging. I found a blown fuse for the OBD2 plug....


It sounds like you're idle speed is too slow, it should be in the 600 RPM neighborhood. The first thing to do is clean the throttle body and throttle plate.

Nov 28, 2010 | 2004 GMC Envoy

1 Answer

My 03 Envoy will not idle. Keeps shutting off...


Got a solution for you on this. There is a small sensor, called the MAP sensor.
It is located on the top of the engine. You will see a blue sticker with Delco Motors 5V GND written on it. Has a wiring harness that you can pry up and
pull off. Unplug the wiring harness and plug it back in. You may need to reset the code errors. I had mine at a mechanic, and he did that , reset the code errors and it solved the problem.

Jun 22, 2009 | 2003 GMC Envoy

3 Answers

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.



Jun 16, 2009 | 2004 GMC Envoy

1 Answer

Idle very low then turns off


this is the cause.
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.

Jun 11, 2009 | 2003 Toyota Camry

1 Answer

My 2003 GMC Envoy tachometer is reading 5-7000 rpm at idle and sweeps off the scale when driving.


I see this a lot on the 03-06 Envoy instrument clusters, it's caused by failing stepper motors on the cluster's circuit board. It can be fixed though, check out this page about how to get it fixed - Envoy tachometer not working

Jun 07, 2009 | 2003 GMC Envoy

1 Answer

AC blows hot air


try this website fix & troubleshoot heating & A/C www.automedia.com and another car A/C repair www.directgardening.com

May 25, 2009 | 2002 GMC Envoy XL

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