Oil leaking into number two cylinder when engine is off

Tiny
JDYE9513
  • MEMBER
  • 1997 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 201,000 MILES
Causing a regular misfire, white smoke for a few minutes as it burns the oil out. While looking it over I did notice the electrical connector to the injector is a little loose, which may be causing the misfire, but I don't think it would cause the oil to leak into the cylinder. Wet compression test confirmed good oil rings. Possibly valve stem seals? Questionable but not sure.
Tuesday, November 17th, 2020 AT 1:27 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon,

White smoke is not oil, it is coolant. That could be dripping into your cylinder causing the smoke.

https://www.2carpros.com/articles/blue-smoke-from-engines-exhaust

https://www.2carpros.com/articles/white-smoke-or-steam-coming-from-the-exhaust-pipe

That could be from a leaking intake manifold gasket.

https://www.2carpros.com/articles/radiator-pressure-test

If it is oil, as you thought, it could be from a valve stem seal. Remove the plug and inspect. If it is white, then it is coolant. If it is black, it is oil.

Roy
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Tuesday, November 17th, 2020 AT 1:48 PM
Tiny
JDYE9513
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  • 3 POSTS
I've already confirmed that the spark plug is oil fouled, dark in coloration, still damp with oil as opposed to the brown with white splotches of coolant.
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Tuesday, November 17th, 2020 AT 1:54 PM
Tiny
JDYE9513
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Was actually looking for other possibilities if the valve seals aren't the cause.
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Tuesday, November 17th, 2020 AT 1:54 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
If you did the wet and dry compression test and it passed, the only thing left is the seals. The valve guides could be worn out allowing too much movement of the valve.

If it were a worn guide, you would have a valve tap from the valve moving around.

Roy
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Tuesday, November 17th, 2020 AT 2:02 PM

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