Question about 2003 GMC Envoy

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

I replaced my battery today on my 2003 GMC Envoy. Now it will not idle correctly. Is it because the computer needs to "relearn" whatever? If so, how long does that normally take?

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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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How to reset 03 gmc envoy computer

dis-connect both battery cables from the battery.
Touch them together and re-connect them to the battery.
remember disconnect both, don't be lazy and only disconnect one.

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Idle control on 2003 GMC Envoy SLT

There is no idle adjustment on these vehicles, it is controlled by the computer.
You probably need to have the throttle body cleaned, make sure it is cleaned on the front side and back side. And the battery should be disconnected while the cleaning is done, this will reset the computer.

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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??

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.

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I replaced the AC compressor on my 2003 envoy and had to remove the alternator. When I put it back together it will not idle when ac is on. I tried to unhook battery to reset the computer but still the...

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Sep 05, 2011 | 2003 GMC Envoy

1 Answer

Yes ihav e 2003 envoy with 4.2 liter an it has started idiling rough

There are a few things that you can do, do get it idling correctly, and it's fairly inexpensive.

1. Clean your throttle body with throttle body cleaner, with the battery disconnected. Needs to be shiny. When finished, drive around for 20 minutes or so with all accessories turned off, so the computer can relearn the newly cleaned TB. About $7 for the cleaner

2. Replace your spark plugs with A/C Delco 41-103, will idle better with this plug. Around $7 ea
3. Replace your upstream 02 sensor, the one right after the exhaust comes out of the engine, easy to replace. Between $67 and $80, try to stay away from Bosch.
4. Replace your fuel filter around $15 or less.
5. Check your vaccum lines for leaks.

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Try giving the starter a whack with a hammer or end of broomstick if it tries or goes, replace the starter

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Rough Idle while stopped and low speeds

heve utried adjusting the trottle , just put your foot on the accelerater and hold at just under 1000 revs if shaking goes then thats your problem should idle at just under 1000rpm

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

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