Question about 1996 GMC Sierra

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Truck backfires at even throttle

Does fine under acceleration or deceleration but at even keel she backfires. changed plugs rotor cap wires cleaned out fuel system?

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  • GMC Master
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Check for leaking injectors and vacuum leaks as there is fuel getting into the exhaust system and igniting. check ignition timing as it may be retarded too far.

Posted on Mar 23, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 58 Answers

SOURCE: no power when hit the gas

The fuel presure should be at least 60- 66 psi key on engine off, and then drop some when started, if it doesn't go any higher than 50 psi that would explain your backfire concern. If it is low then the fuel pump is weak. I have also seen soot on the little wires inside the Mass Airflow Sensor cause a concern like this.

Posted on Nov 18, 2008

dennymulford
  • 1055 Answers

SOURCE: 1997 GMC TRUCK IS MISSING AT ACCELERATION

timing chain is streched replace chain and gear set

Posted on Feb 24, 2009

cadman000
  • 607 Answers

SOURCE: 95 GMC hesitation

By "OVERDRIVE '' . are you meaning the TCC ( torque converter clutch ) is engaged ? and if so, when you increase RPM's to accelerate, it should disengage otherwise causing a noticeable hesitation. Hope this helps

Posted on May 07, 2009

  • 232 Answers

SOURCE: 1991 gmc med duty truck with 454 tbi ,backfires, no power.

By module do you mean computer? There's nothing wrong with it. Yea, replace all ignition components with new ones. New cap, rotor, wires and spark plugs.

Posted on May 18, 2009

Carburetor1
  • 32 Answers

SOURCE: truck misses under acceleration after it's warmed up.

that is a tricky one you have almost replaced everything. that is fuel injected if you dont have the right fuel pressure when you step on the gas it will fall on its face you need to take a fuel pressure reading and also it could be as simple as the fuel filter which is often over looked it could be cloged restricting the flow. also check the MAP sensor

Paul
www.carburetorexchange.com

Posted on Sep 02, 2009

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