Question about 2003 GMC Envoy

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SEVERE LOSS OF ENGINE POWER

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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6 Suggested Answers

6ya6ya
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SOURCE:

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Posted on Jan 02, 2017

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  • 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

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  • 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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1 Answer

2003 gmc envoy... I was told i needed a fan clutch.... Then. Next thing i know check engine soon, reduce engine power... Whats going on then computer... P1221, 1271, 1635 still not fix


if you were told that the fan clutch needed replacing and you did not do that , then the engine light and the loss of power would be a result of overheating of the engine and it going to limp mode
take it to a gm service centre for a explanation of the fault codes

Feb 12, 2017 | 2003 GMC Envoy

1 Answer

Loss of brake during sudden acceleration.


Click 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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Loss of acceleration?

http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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Acceleration lag problem?

http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

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How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Engine accelerates when brake is applied?

http://technoanswers.blogspot.in/2012/02/engine-accelerates-when-brake-is.html

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This will help.

Thanks.

Feb 14, 2012 | 2003 Mercedes-Benz E-Class

1 Answer

Intermittent poor acceleration, loss of power. Has


How is your charging system? Sounds to me like it's not charging your battery, so it runs until the battery cannot support the ignition load.

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1 Answer

Poor acceleration and loss of power


If the engine mechanically is good ---no knocking or piton-slapping noises--chances are your engine breather system is plugged up.----possibly plugged up in the valve cover---the tube or hole where the PCV valve is located in the valve cover. check the PCV valve too --when you sake it you should hear it rattle.
To check the valve cover without taking it off --remove the PCV valve and with a piece of hose inserted in it's place inthe valve cover try blowing thru it---( with engine off ) if you can not then remove the valve cover and manually unplug the blockage.

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Burning Oil!!! If its not burning carbon deposits and choking on an intake blockage. Both will cause severe power loss, though intake blockage is not an immediate sign of fatal engine problems. Power loss due to oil burning is a symptom of warn out piston rings and cylinder walls. This allows oil to seep up into the combustion chamber which at the same time allows the needed fuel/air compression to escape between the piston rings and cylinder walls. Either way, this is NOT a good symptom to experience. You may confirm or rule out the worn out internal engine components by checking the oil dip-stick for fresh gasoline odor......I would strongly advise you take your car to a reputable mechanic or dealership. And I'm really sorry, but as much as I love Jaguars, parts are EXPENSIVE! Your monetary health might suffer less had you even owned a Ferrari

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1 Answer

Engine light flashes when accelerator pedal is applied accompanied by severe power loss and trouble revving up


the check engine light is flashing to alert you to the fact that the engine has a missfire in the ignition system, don't continue to drive this with the condition or u can overheat and damage the catalytic converter.

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2 Answers

SEVERE LOSS OF POWER


check for a failed cat converter blocking the exhaust system

Apr 07, 2017 | 2003 GMC Envoy

3 Answers

Loss of power


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.

Jun 12, 2008 | 2003 GMC Envoy

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