1996 GMC C2500 excessive fuel smell out the exsust

Tiny
SJESSIP
  • MEMBER
  • 1996 GMC C2500
  • V8
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
My 96 truck shows a check engien light, idols and runs ruff the code I am getting is p0300 witch states multiple cylender misfire. Need to know posible cause?
Thursday, May 28th, 2009 AT 4:58 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random Misfires-normally indicates vacuum leaks and bad fuel.

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, or even bad fuel.
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Thursday, May 28th, 2009 AT 5:01 PM

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