What causes oil to collect in the spark plug hole?

Asked by Feb 02, 2017 at 01:47 PM about the 2001 Ford F-150 Lariat Crew Cab SB

Question type: Maintenance & Repair

When changing spark plugs on my 2001 Ford F-150 triton 5.4L engine I
noticed oil collected in the spark plug hole before I pulled the old plugs. What
can cause this and will it affect engine running normal?

3 Answers

109,565

leaking valve cover gasket...

76,625

The oil could attack the coil boots and break them down so I would fix the leak.

52,015

Leaking spark plug well gasket that is part of the cam cover gasket set. Get it replaced. It will require removal of the cam cover.

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