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Misfire cylinders three and four, head gasket replacement

Tiny
BANSHEE JOHN
  • MEMBER
  • 2004 FORD F-150
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 245,000 MILES
Number three and four cylinders misfiring. Spark plugs have fouling but not from oil. Can I replace just that side head gasket or should I replace both?
Sunday, September 2nd, 2018 AT 12:11 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

It is always suggested to replace the pair.

How did you determine you have a failed head gasket? Did you do a compression test?

Roy
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Sunday, September 2nd, 2018 AT 1:38 PM
Tiny
BANSHEE JOHN
  • MEMBER
  • 2 POSTS
My mechanic made that determination. He thinks it started with the o2 sensor in the converter went causing it to call for more fuel. Anyway new converter passenger side, two new o2 sensors, coils, plugs. Three and four fouling, plugs have a liquid on them not oil. I got almost 250, 00 miles on the truck. I am going to fix it and sell it.
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Sunday, September 2nd, 2018 AT 4:49 PM
Tiny
BANSHEE JOHN
  • MEMBER
  • 2 POSTS
Thanks for the information. Should I put new head bolts too?
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Sunday, September 2nd, 2018 AT 4:51 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, that is a good idea.

You are welcome.

Glad to help.

Roy
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Sunday, September 2nd, 2018 AT 5:05 PM

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