my 1993 f-250 460 keeps fouling the #5 plug

Asked by Mar 19, 2017 at 03:51 PM about the 1993 Ford F-250 2 Dr XL 4WD Extended Cab LB

Question type: Maintenance & Repair

just bought the truck.its got a small miss,fouling the #5 plug..replaced it,fouled
it again.

6 Answers


Oil fouling or carbon fouling?

1 of 1 people found this helpful.
Best Answer Mark helpful

oil..but what is it for both?,just in case im

its a five speed 460 engine


Oil fouling is likely from a bad valve stem seal or worn oil control rings. I would use a spark plug from a hotter heat range to burn off the fouling. Carbon fouling is from running too rich.

1 of 1 people found this helpful.

do you have to take the motor apart to change the rings and valve stem seal?


Yes you would.

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