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.

Your Answer


Looking for a Used F-250 in your area?

CarGurus has 2 nationwide F-250 listings and the tools to find you a great deal.

Postal Code:

Ford F-250 Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Ford F-150
533 Great Deals out of 9,869 listings starting at $3,490
Used Ford F-350
2 listings
Used Dodge Ram 2500
4 Great Deals out of 86 listings starting at $7,900
Used Dodge Ram 1500
47 Great Deals out of 484 listings starting at $2,495
Used GMC Sierra 1500
159 Great Deals out of 12,108 listings starting at $1,775
Used Ford Mustang
1,021 listings starting at $3,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.