Question about 2002 GMC Envoy

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Check engine light

Yesturday my truck started acting like it was having a hard time running/accelerating. We took it to Shucks, and they said it was the spark plugs that needed changed. We changed all 6 of them today, the really bad one had some kind of oil on it. We bought really good spark plugs, and still my check engine light is on. And the car stinks really bad like burned rubber. Also if I get to 30mph the check engine light starts to blink.

Im so stressed about this, does anyone know what could be wrong? Has anyone had a similar problem????
Please Help!
Thank you

Posted by on

  • aaguailar_ke Dec 02, 2008

    I dont think that I overheated it. I drove sunday morning to work about 5 miles from home. It sat for about 5 hours then I drove it back home. About 2 blocks down the road is when it started to act funny etc. We are thinking about taking it to jiffy lube and having a tune up done. do you think we should have them do a diagnostic compression test then????

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Did you overheat the vehicle?..if oil is on one plug severely you may have mechanical issue (rings/valve stems) leaking into cylinder...get diagnostic compression test and leak down and scope electrical secondary system and advise me results

Posted on Dec 02, 2008

  • milespeed Dec 02, 2008

    jiffy lube is not qualified to do diagnostic work ...do yourself a favor and do not throw money at it helplessly... contact a qualified technician and have the appropriate tests i suggested done..once...know your issues for sure and then spend..once...for the repair..:) good luck and keep me posted !!

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1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
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2a. Fully depress the accelerator pedal (HARD).
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3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking.
4. Fully release the accelerator pedal (while the CEL is still blinking)
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7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.

If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.

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