1996 GMC Jimmy

Tiny
TCARDER
  • MEMBER
  • 1996 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
Running ruff studders on accceleration and at idle showing codes P0102 & P0300, mass air flow sensor low voltage and random miss fire. Changed the mass air flow with no change codes came back then replaced the cat which was bad runs a little better but still ruff and codes came back and ideas.
Tuesday, February 16th, 2010 AT 1:50 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random Misfire could be caused by vacuum leak and fuel contamination-

Engine running rough/misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure.
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Tuesday, February 16th, 2010 AT 2:00 PM

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