1997 GMC Jimmy backfire

Tiny
CSHEESE
  • MEMBER
  • 1997 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 148,000 MILES
What is causing my Jimmy to backfire and hesitate to take off? It only occurs sometimes. What do I need to do? Is it a tuneup problem or fuel?
Thursday, February 11th, 2010 AT 6:40 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the following below:

Oxygen sensor
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)
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Thursday, February 11th, 2010 AT 6:43 AM

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