Question about 2002 GMC Envoy

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Wanting to stall at all speeds

2002 GMC Envoy Has about 120,000 miles on it. It first tried to stall going down the highway at about 70 MPH. Keep my foot on the gas, but it didn't get the feed to speed up. Kept my foot on the gas, and it then, real quickly took off. It acts like a car acts when it is running out of gas, chugging like. It will do it at all differant speeds, slowing down,speeding up, going up hills, with air on, with air off, with cruise on, with crusie off. Had the fuel filter changed and stuff you put in the gas tank to clean it, twice. Didn't help. The check engine light does not come on EXCEPT TWICE, and this was when I was pulling into my drive way when the SUV completed died. All the lights came on and one that said, "Check Gauges". I turned the key off, waited about 15 sec. and it started up again, Check Engine light was off. Check Engine light came on again when going down the road abut 60 MPH. Stayed on for about 10 min. and was going to stop in to get a Diagnostic ran on it but by the time I got to the garage or Auto Zone the light went off. I called GMC for assistance and they said because the "check engine" light is not on, that is not likely that even a dealership cam find the problem. Took it into a local shop, they put new plugs on. Didn't fix it. Took it to the dealership, GMC, and they ran a test on the fuel pump and said it wasn't the pump. They cleaned the throttle body. They said because it was partially clogged
that it made my idel speed be too low, about 600 RPM. After cleaning the throttle body, it then went to 950 RMP. However, car is still stalling like it is running out of gas. When it completly stalls, it locks brakes and steering because the engine is not running. No one knows what is wrong with it. Even the manufactor. Please help.

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  • joywhite66 Oct 17, 2008

    After about 1300.00 worth of useless repairs, trying everything from sparkplugs to fuel regulator, we tried the oxygen sensor. WaLAA!!! Now it runs great. Thanks guys for helping.

  • Steven Brock May 11, 2010

    No one knows? That's odd.... I'ld suggest fuel regulator. It's like a $20 piece, I think, and easy to replace yourself. All you need, depending on the style, is a pliars or a c ring clamp/pliars



3 Answers

Actually, my brother in law, when halling logs on his semi had to make an emergency stop into a garage on his route. Something was going on with his semi.. don't recall the problem. The macanic there put a "advanced" diagnotic test on it and it pulled up the codes, and fixed his problem. My brother in law told him about my car and the macanic told him to bring my car down and he would find the problem. We did. He was able to retrieve the codes (unlike the dealership and another gargage) and called GMC with the codes. They reported that it was the oxygen sensor. I thank God for that macanic and his generousity. It only took me about $1300.00 to find a $55.00 dollar problem. YEAHHHHHH!!!!!!!!!!!!!!

Posted on Oct 20, 2008

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Sorry that didn't help you. Glad you got it going though. How suggested that?

Posted on Oct 17, 2008

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It sounds like a electrical problem to me. Like the ignition control module. It can be tested at your local auto parts stores.

Posted on Oct 17, 2008

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