Question about 2003 GMC Envoy

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Loss of power

Severe power loss, especially when a.c. is on. Noticably better with a.c. off, but still there. Dirty fuel injectors maybe? Also, ticking noise at idle, sounds like it's from the fan - maybe

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  • joshley Jul 30, 2008

    Good day Scott, I need your expert advise. I have a 2003 ENVOY with loss of power or poor acceleration problem. The workshop cannot find a fault so they took from a known good ENVOY a pedal position sensor, air flow meter and a fuel pump and install it on the subject vehicle but the it does not resolve the concern. We also installed a new PCM/ECM and it did not improve. The VIN is 1GKDT135132394553. Loss of power/poor acceleration is experienced even with the A/C off and from stand point and transmission in neutral the engine labors to reach 3,000 rpm with accelerator pedal down to the floor. Would appreciate your technical assistance Thank you.

  • klement4 Aug 19, 2008

    This problem sounds similar to mine. Loud engine and poor acceleration. The shop says nothing is wrong, yet I know there is a severe difference in acceleration from 2 days ago. It almost sounds like a jet engine on take off - too bad the power to move is not there anymore.
    We replaced the fuel pump (?) less than 1 year ago.


  • Scott Dornon Nov 16, 2008

    My loss of poweer problem was finally solved by diagnosing & replacing the camshaft actuator selenoid valve. Fairly easy job, takes about an hour or so. Part was $94 from GM.

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For the person with the loud engine and poor acceleration, the problem is likely the fan clutch. I think it is about 800$ to be repaired.

Posted on Nov 15, 2008

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Replace fan clutch.

Posted on Sep 28, 2009


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Check for a vacume leak and check battery cable connections for corrosion also get battery and alt. tested

Posted on Jun 26, 2008

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