Question about 2004 GMC Envoy

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I have a 2004 GMC Envoy that has all of a sudden developed a rough idle. It seems to get worse as the engine gets hotter. ie: after driving for 15 minutes . Everything else is fine. Runs great, same gas mil, no service engine light. I am sure this has nothing to do with it but this came about after the smog test I had a month ago.

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There is a small chance that something was knocked loose when they did the test. be that as it may you seem to have one or two problems. one of the sections of the coil pack may be failing and need to be replace. quick test for this is to pull one lead at a time from the coil pack to see if the engine idle changes. the other issue may very well be a vacuum leak. listen for a whisting sound at idle.
if you do need a coil pack the best (cheapest) way to get one is to drop by your local wrecking/recycling/junk yard. my ford windstar used the same coil pack as a toyota, it cost me $40 dollars as opposed to $160 at the dealer.

Robert

Posted on Aug 20, 2010

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1 Answer

Where is the egr valve located on a 2004 gmc envoy xuv, and will a bad egr valve cause rough idle and rougher idle when ac is turned on?


Yes it could cause that. the EGR is near the rear of the engine, if it is leaking it will sizzle water when you touch it with wet fingers.

Jul 17, 2012 | 2004 GMC Envoy

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Idle good when cold, hotter it gets the worst it idles especially when sitting at stop lights


simple test for a vacuum brake booster
star and run the engine at idle without applying the foot brake
if it gets worse when the foot brake is applied , it is a vacuum leak in the booster ( replace the booster )
otherwise check for failed vacuum hoses including under dash control lines , vacuum leak at the manifold or EGR unit

Apr 16, 2017 | Chevrolet Astro Cars & Trucks

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I have a 2003 GMC Envoy XL. I replaced the battery yesterday and when I started the car, the engine had a VERY rough idle, died a couple of times and then the SES light came on. I was told to drive the car...


When you disconnected the battery, the PCM (power control module) was reset to factory default. You can try driving it with several engine on/engine off cycles. Get it up to 50 mph each time so the computer can recognize the transmission operation also. Hope this helps.

Aug 05, 2011 | 2003 GMC Envoy Xl

1 Answer

I have a 2002 envoy 4.2 vortec it has a rough idle when i put it in drive but but it does not do it in park and its worse when it cold if i drive it for about a hour it smooths up do not have a code yet...


Hi and welcome to FixYa!

Looks like that you have a faulty TPS (throttle position sensor). If the TPS is faulty you'll have a rough idle when in drive even worse during cold start ups. It is located on the throttle body. Have it replaced and you'll be good.

Hope this helps and thank you for using FixYa! Have a good one!

Jan 27, 2011 | 2002 GMC Envoy

2 Answers

2004 envoy 4.2 6cyl. runs rough. had a new


take the breather off and take a 10 mm socket to take the coil off easy to get to then take a 5/8 plug socket to take out plugs easy to get to,

Jan 03, 2010 | 2003 GMC Envoy Xl

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

Envoy 2004 idle speed


Hi
your problem seems very easy :) hope this one work with your envoy. Just buy AC DELCO carburetor tune-up conditioner.

How you use it: engine running , AC off please

1. detached the big black airflow hose which is attached in the mannifold of the engine block.

2. ask your friend to step on the gas pedal and set the rpm steady in 2000 rpm only.

3. then spray vigorously in 8 seconds the inside circle opening of mannifold while your friend steady step on gas pedal with steady 2000 RPM only.

4. after you spray, let your freind continue on gas pedal with 2000 rpm for 15 more seconds.

5. attached back the airflow big black hose to the manifold and you are ready to roll with your AC on.

if this one doesnt work, please scan your envoy by scanner called TECH II. and find out.

Jul 09, 2008 | 2004 GMC Envoy

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