Question about 2003 GMC Envoy
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.
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Posted on Jan 02, 2017
SOURCE: temporary loss of power
have fuel pressure checked if ok should be approx 60psi.if ok try disconnecting mass air flow sensor connector to see if problem is eliminated. this the computer in to a default mode.the sensor is a common problem.thanks from schleck
Posted on Sep 02, 2008
Other problem areas to check are a clogged catalytic converter and rear axle gear oil level (Astro/Safari axle seals leak causing shuddering under load and eventually seizing).Also GM's have had strange intermitent engine and trans problems that dissapear after replacing the main fuses. Check with a GM dealer for TSB's for your truck.
Posted on Feb 05, 2009
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Feb 12, 2017 | 2003 GMC Envoy
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the link below to troubleshoot this problem: ---
Car loses power while acceleration? http://schematicsdiagram.blogspot.com/2011/12/car-loses-power-while-acceleration.html
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