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1997 Ford Aerostar ignition coil

Tiny
CHUCK SARKELA
  • MEMBER
  • 1997 FORD AEROSTAR
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 16,000 MILES
The "check engine" light came on a couple months ago. Computer diagnostic indicated mis-fire on #5 cylinder. I installed new spark plugs & wires, engine ran fine for about 2,000 miles, but the "check engine" light reoccured. Computer diagnostic again indicates mis-fire on #5 cylinder. The mechanic suggested replacing the ignition coil. This doesn't make sense to me. How does the ignition coil function? Can it affect only 1 out of 6 cylinders? Where is the coil located? Is it difficult to replace?

Vehicle has a 4.0 liter V-6.
VIN# 1FMDA41X5VZB43252

THANK YOU & MERRY CHRISTMAS

Chuck Sarkela
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Sunday, December 21st, 2008 AT 11:55 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Chuck:
The coil is what creates the spark / power for the spark plugs. It is hard to believe that a coil can pick and choose what cylender will have a problem. If you remove the spark plug from #5, what does it look like? Also, you may want to check the compression in that cylender to make sure it's not low.

Let me know what you find.
Joe
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Tuesday, December 30th, 2008 AT 12:06 PM

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