1996 GMC Safari MISFIRE

1996 GMC SAFARI
153,656 MILES • 6 CYL • 2WD • AUTOMATIC
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JACOLLIER
  • MEMBER
  • 5 POSTS
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.
Aug 3, 2009 at 12:59 PM
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 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.
Aug 3, 2009 at 3:32 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.