1996 GMC Safari MISFIRE

Tiny
JACOLLIER
  • MEMBER
  • 1996 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 153,656 MILES
THE VEHICLE MISFIRES ON CYL. #1 AND #2 AT IDLE
BUT WILL GO AWAY AT HIGHER RPM, WE HAVE 55 PSI FUEL PRESSURE, AND NEW PLUGS, CAP, ROTOR, AND WIRES.
Monday, August 3rd, 2009 AT 12:59 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine 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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Monday, August 3rd, 2009 AT 3:32 PM

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