Why does my GMC Envoy die at idle?

Took it to them. When the vacuum line is activated for the engine, such as when the air or heat was on, the truck would die at idle (when in gear only, would not die if in neutral). I had changed the battery and on the Envoys it resets all previously stored air/ fuel, idle, etc info that the computer had previously gathered about the motor.

What’s the problem with my GMC Envoy XL?

Starter works when I jumped the relay. Swapped ignition switch same problem. Tested starter relay, checked out good. I’ve only had this truck for 1 month. I need help! 60 people found this helpful. 2004 GMC Envoy XL . Changed these parts : Starter. Battery. Ignition switch.

How many people have commented on the GMC Envoy?

Go to the next comment I’ll post it on there don’t worry it’s easy as heck . 35 people found this helpful.

What was the problem with my 2004 envoy?

2004 Envoy.. When turned on A/C or defrost engine would stall & cut off. I turned off A/C or defrost, cranked & ran fine as long as both were off. Took to shop; had throttle cleaned.

What causes a truck to stall and shut down?

The steering wheel will lock up and I have to put it into Park. It does always restart. Heat, A/C, and defrost cause engine to stall and shut down. i had this problem for a while ( my personal vehicle). The truck would go into reduce engine power mode at first. Turn the engine off and restarts with no prblem.

Is the top end of the envoy OK?

Accelerates fine and top end is fine. Just a pronounced misfire at about 500 rpm. Cleaned TB, run BG44k through tank. Cleaned Camshaft actuator solenoid. Was clean even after 200k, first time I’ve pulled it. Pulled plugs, look fine. Have about 50 k on denso plugs. Changed motor mounts with oem.

Do you need an OEM Service Manual for envoy?

Only use AC mounts, the aftermarket is very hit or miss, biased to miss, on damping the 10 Hz frequency at idle. He did say he replaced the mounts with OEM. Need GMT360/370 Service Manuals?

Why does my envoy have a gasoline smell?

Traced the gasoline smell to a leaking FPR, gasoline smell fixed but rough idle continues. I admit I didn’t check the intake bolts behind the little hose, but none of the other bolts were loose and I sprayed some starter fluid around that area with no change in rpm.

Is the # 5 cyl engine a dead Miss?

Yes it had a complete valve job at the engine shop. It is a dead miss all the time only on # 5 Cyl.Compression on all cylinders are right at 150. Vacuum at idle is about 18 with no discernable fluctuation.

Where to find comments on gmtnation engine rebuild?

PLEASE READ THE COMMENTS WAY DOWN AT THE BOTTOM OF THE PDF AS MADE BY MR. ROBERT ALAN …AS HIS CONCERNS ARE PARALLEL TO YOUR PRESENT SITUATION.

When did the GMC Envoy instrument panel problems start?

It’s a short in the instrument cluster. I had the same problem with my 2004 XUV. It started in early December of 2007. Intermittent manifestations, than more persistent. They replaced the ignition switch and sent me home. It got progressively worse. It’s a short in the instrument cluster. They needed to replace the entire cluster.

How much does it cost to fix a GMC Envoy?

Concerning the envoy instrument panel issue, no luck with the dealer on tuesday. Informed them of the instrument cluster, the tech played around with the truck and then confirmed replacing the cluster. At minimum it will cost $700 for them to repair, it could be more.

Why does my GMC Envoy have a blinking light?

2005 GMC Envoy – 4.2L 6 Cylinder 135,000 mi, My engine has a blinking light on. mechanic says its the cylinder 1 has no compression that’s why the truck is misfiring. I don’t understand the truck was running perfectly until a cold day came through and I turned it on.

When did GMCs envoy start using Active Fuel Management?

I’ve read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007.

Is the GMC Envoy Air Conditioner working fine?

My 2005 GMC Envoy air conditioner is working fine only the I am getting large amounts of water condensation on the passenger floor area. Is there a problem with a leaky hose or something that handles the condensation. There is no condensationh on the ground when you turn off the car.

Is there a blower resister on a GMC Envoy?

Hi yes i have a 2004 GMC Envoy and that also happened to mine my air works fine up until you turn the dial to 5 its actually your Resister (which controls the fan speeds) a Blower Resister and you usually can only get it at the dealer.

What are the vents on a GMC Envoy?

One black straight rubber tube first, about 1 to 2 inches long, and a connecting plastic black elbow (90 degrees). He proceeded to clean them out by blowing in them and then reinstalled them. He said that this is where blockage impedes the flow of condensation and causes leaks in side.

2004 Envoy.. When turned on A/C or defrost engine would stall & cut off. I turned off A/C or defrost, cranked & ran fine as long as both were off. Took to shop; had throttle cleaned.

Only use AC mounts, the aftermarket is very hit or miss, biased to miss, on damping the 10 Hz frequency at idle. He did say he replaced the mounts with OEM. Need GMT360/370 Service Manuals?

What happens when your a / C unit is idle?

When you are at idle, you are not producing as much pressure as when you are accelerating. So if your freon levels are low, then when you idle you very well may not get any cold air through the vent. As A/C runs like a giant circle of pressure, you need to make sure all the levels are sustained at all times.

How big is the fuel filter on an envoy?

Pulled plugs, look fine. Have about 50 k on denso plugs. Changed motor mounts with oem. Air Filter has about 10k on it, fuel filter at about 25k. Not sure where to go from here, I don’t want to just throw parts at it.

How to check no fuel condition on GM 4.3L?

I’ve also included how to check a no fuel condition with starting fluid (although this is not the most effective way to test the fuel pump). It’s been my experience that misdiagnosing a bad fuel pump is a common occurrence on the 4.3L, 5.0L, 5.7L GM vehicles with the ‘Spider’ fuel injector assembly.

Can a fuel pump cause a no start condition?

CASE 1: If your fuel pressure gauge read 50 PSI or more as the engine cranked. This means that the fuel pump on your 4.3L, 5.0L, or 5.7L is OK and not the cause of your No Start Condition. The next step is to observe the fuel pressure gauge’s needle (after your helper stopped cranking the engine).

How can I tell if my fuel pump is leaking?

Once the fuel pressure gauge registers pressure, check for fuel leaks around the Schrader valve. It’s very important that NO fuel leaks are present for the accuracy of the test. Once you have verified no fuel leaks, continue to the next step.

How to troubleshoot the fuel pump on a GM 4.3L?

Troubleshooting the fuel pump (GM 4.3L, 5.0L, 5.7L) (for ‘Spider’ fuel system equipped vehicles). How To Test The Fuel Pump On GM TBI Fuel Systems (for throttle body fuel injection fuel system equipped vehicles).

What does it mean when your fuel pump is bad?

This means that the fuel pump is bad, even if you spray starting fluid down the throttle body and your vehicle Starts. If the engine does not get at least 50 PSI when cranking, it won’t start (and is the surest indicator that the fuel pump will go completely bad in short).

What happens when air conditioner is turned on at idle?

Might want to try this.found bulletin #1878920. Engine stalls when air conditioning is turned on at idle – keywords HVAC rough condition CJ2 CJ3 surge. Engine may stall with the air-conditioner on and or while adding additional loads to the engine at idle.

Can a bad throttle position sensor cause idle surging?

Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. 3) Check Engine Light

What causes idle surges on a car ECM?

Why does my GMC Envoy die at idle?