Number 6 cylinder misfiring

SILVERSEL

MEMBER
2001 FORD WINDSTAR

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.

Sunday, February 22nd, 2009 AT 3:58 PM

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,138 POSTS

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

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Sunday, February 22nd, 2009 AT 7:45 PM

SILVERSEL

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4 POSTS

I did replace the plug and wire. There is only one ignition coil for all six cylinders.

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Monday, February 23rd, 2009 AT 8:59 AM

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

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

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Monday, February 23rd, 2009 AT 9:09 AM

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

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Tuesday, February 24th, 2009 AT 8:18 AM