Mis fire on car

LEONARD101

MEMBER
1999 FORD WINDSTAR
6 CYL
FWD
AUTOMATIC
165,000 MILES

Having problem with the ford windstar it is misfiring on cyclinder number 2, I have change out the plugs and wires and still is doing it. I have notice that the car rpm is moving up and down at idle and still don't know what to do I am getting a spark between the wire and the coil pack but only check by taking the wire off and seeing the spark

5 Replies

PROTECH1980

MEMBER
901 POSTS

If you have good blue spark at plug, check compression on suspect cylinder, check for injector pulse at injector, try swapping injector with another cylinder, see if misfire follows suspect injector. If you are having idling issues, may have vacuum leak at intake, if leaking vacuum near #2 intake runner, that could be the cause of misfire

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Friday, April 15th, 2011 AT 1:31 AM

LEONARD101

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3 POSTS

If it was an injector wouldn't it smoke black from a leak

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Friday, April 15th, 2011 AT 1:40 AM

PROTECH1980

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901 POSTS

No. Have you checked compression, and injector pulse?

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Friday, April 15th, 2011 AT 1:45 AM

LEONARD101

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3 POSTS

No I have not check the compression and injector pluse, I had to change out a coolant hose that was leaking but I am going to check that today. I don't see how the car wouldn't smoke if the injector was leaking causing it to fire before the piston reach top dead center but I will check.

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Friday, April 15th, 2011 AT 2:40 PM

PROTECH1980