Question about 2004 GMC Envoy

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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.

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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.

Posted on Oct 23, 2010

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1 Answer

Roaring engine noise in cab when idling. Idles at 500-950 rpm..When raising rpm in idle noise goes away.2002 GMC Envoy 6 cly.


Should idle between 500-600. Clean your throttle body with the battery disconnected to help with the fluctuation. The roaring very well could be your fan clutch. Fan clutches are a known problem with our platform. If engaged, will sound like an airplane.

Jun 06, 2017 | 2002 GMC Envoy

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Finding the idle goes up n down/die out when using Defrost


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.

Feb 22, 2013 | 2002 GMC Envoy

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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

1 Answer

2004 GMC Envoy. When I turn my ac on, my engine will die unless i am accellerating. If I try to idle, it dies all the time. The air that blows out is not cold and the air compressor is not engaging at...


You may have two problems, a dirty throttle body and low AC refrigerant.

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. Make sure to clean the front and back sides of the throttle body. Also, disconnect the battery during the cleaning process to allow the computer to reset and relearn to the cleaned throttle body.

The HVAC system needs to be checked by a HVAC technician. Just charging the system would be a temporary fix since there maybe a leak.

Jul 01, 2012 | 2004 GMC Envoy

1 Answer

2004 GMC Envoy- Whenever the heater is turned on the RPM drops to about 500RPM and sometimes dies. What could be causing this problem?


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.

Nov 05, 2010 | 2004 GMC Envoy

2 Answers

Replaced coolant sensor on my 2004 GMC Envoy XL 6 cylinder. I had to disconnect the battery and alternator. All was reinstalled,truck runs fine but when I turn on the a/c the truck turns off and idles...


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

1 Answer

My 2004 GMC Envoy does not idle up when I turn on the air-condition,and the AC then cuts off. What part controls the idling that should take place when the AC is turned on, and what could be the reason for...


take it to a shop with a scan tool and have them watch the A/C pressure in the system when it is turned on...if it does not move or fluctuate then the A/C pressure switch is not good and the computer does not recognize the A/C being turned on so it will not increase the idle.

Jul 12, 2009 | 2003 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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