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1997 Ford Windstar MISFIRE CYLINDER #4

Tiny
DAVID JERNIGAN
  • MEMBER
  • 1997 FORD WINDSTAR
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 145,000 MILES
I HAVE CODE FOR MISFIRE CYL. 4, HAVE CHANGED PLUG, & WIRE, INJECTOR, & INJ HARNESS, COIL PACK APPEARS OK, ONLY SEEMS TO HAPPEN APPROX. 40 TO 50 MPH. UNLESS ACCELERATING THROUGH THAT SPEED, CHECK ENGINE LIGHT FLASHES MOST OF THE TIME IT HAPPENS, VEH. DOES NOT BURN OIL INTAKE MANIFOLD ACTUATORS ALSO REPLACED DUE TO PREVIOUS CODE FOR THOSE, SEEMS TO RUN GOOD AT HIGHWAY SPEED. NO VACUUM LEAKS NOTICED.
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Sunday, September 13th, 2009 AT 1:23 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the compression for no.4 cyl

Misfires 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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Sunday, September 13th, 2009 AT 4:30 PM

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