Question about 2004 GMC Envoy

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2004 GMC Envoy Help Please

When I am driving my Envoy it does fine, but when I am idling the RPM's jump up and down until it dies. Also I just had to have some work done on the electrical system so I am not sure if that could have anythingto do with it.

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  • jdarch Oct 03, 2008

    I have the same problem. I have noticed it is when I turn on the fan, and it is even worse when I turn on the A/C. I have not had any electrical work done. I am going to have my alternator and battery checked.

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YES CLEANING THE THROTTLEBODY WILL WORK ON THIS I HAD THE SAME PROBLEM.

Posted on Nov 11, 2008

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What kind of electrical work did u have done? try cleaning the throttle plate by removing the air intake hose and spraying down with carb cleaner and wiping butterfly down with a rag

Posted on Sep 23, 2008

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1 Answer

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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.

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That part you can take to an autozone and have tested for free. If the module is fine then it may just be the gauge gone bad.

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2004 GMC Envoy. My ac is causing my engine to fluctuate in RPM's and will cause engine to die somtimes. If I turn ac off it will idle just fine. Need help.


The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean.

Oct 16, 2010 | 2004 GMC Envoy

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Apr 04, 2010 | 2004 GMC Envoy

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Sounds like ac compressor is dragging.It might be that rpm is to low also.Step on the accelarator and if you have a tach bring rpm up to 700 to 800 in drive which is were it should run with ac on. With ac off rpm should read around 600 in drive.

Mar 14, 2010 | 2004 GMC Envoy

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It sounds like you have a charging system problem. When you turn on the A/C the alt is not keeping up with the required ampre. I hope this helps.
Thank You,
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Aug 04, 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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