Question about 2003 GMC Envoy

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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

  • 23 Answers

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

  • 37 Answers

SOURCE: Loss of Power at Freeway Speeds

Sounds like itr is not getting enough fuel. Try or check the fuel filter for dirt or water, and also check the fuel pump pressure to see if it meet factory specs.
Good Luck Jerry
[email protected]

Posted on Dec 13, 2008

  • 21 Answers

SOURCE: loss of power

The problem could be a plugged cat convertor, or fuel filter

Posted on Dec 21, 2008

  • 170 Answers

SOURCE: 2000 Safari, engine/trans stumbles under load. Already replcd...

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

  • 2 Answers

SOURCE: I was only asking for a simple answer I have a

I think it's under the dash- driver's side, behind the fuse panel

Posted on Jul 22, 2009

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