number 6 cylinder misfiring

2001 FORD WINDSTAR
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SILVERSEL
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Engine Performance problem 6 cyl Front Wheel Drive Automatic 122000 miles

Had engine code P0306, which is #6 cylinder misfiring. Replaced plug and lead, also checked fuel injector for clicking sound which means it is working. I am wondering if coil is bad in cap.
Feb 22, 2009 at 3:58 PM
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STRAILER
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Hello,

I would do a compression test to see whats going on. Here is a guide

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run this test and get back to us.

Cheers, Ken
Feb 22, 2009 at 7:45 PM
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SILVERSEL
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I did replace the plug and wire. There is only one ignition coil for all six cylinders.
Feb 23, 2009 at 8:59 AM
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JACOBANDNICKOLAS
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If you replaced the plug, wire, and you hear the injector working, you need to check compression in that cylinder. As far as the coil, I would think a bad one would create a random misfire and not only cyl 6.

Let me know what you find. Also, make sure there are no vacuum leaks.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Joe
Feb 23, 2009 at 9:09 AM
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SILVERSEL
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Ford car dealer found broken valve spring on #6 cylinder. Van runs fine now. I was glad to see that it was only a broken valve spring and nothing major. I appreciate all the help and maybe this will help someone else with a like problem. $280.00 all fixed
Feb 24, 2009 at 8:18 AM
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