Misfire cylinders three and four, head gasket replacement

2004 FORD F-150

245,000 MILES • 4.6L • V8 • 4WD • AUTOMATIC

BANSHEE JOHN

MEMBER
2 POSTS

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?

Sep 2, 2018 at 5:11 AM

ASEMASTER6371

✓Experienced Mechanic
52,796 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

Sep 2, 2018 at 6:38 AM

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.

Sep 2, 2018 at 9:49 AM

BANSHEE JOHN