Q: I have a 2001 Lincoln LS and the spark plug on the number 8 cylinder is leaking getting oil on the spark plug what do you think th

asked by on May 08, 2017

My 2001 Lincoln LS engine light came on and I got the code saying that the number 8 cylinder is misfiring after inspecting the spark plug there was oil on the spark plug what you think the problem is and how much would it cost to repair

My car has 155000 miles.
My car has an automatic transmission.

Sometimes there can be oil on the spark plug threads but the plug itself is not fouled. If the firing end of the plug is OK (not fouled, and not covered with liquid oil and so forth), the cause of the misfiring is probably not the oil leakage but rather something else. If there is oil on the plug electrode and the plug is fouled, the oil gets in due to leaking piston rings or leaking valve guides and valve stem oil seals. You can try to gauge the condition of the rings, and cylinder No. 8 in particular, by testing cylinder compression in all cylinders. If compression in No. 8 is lower than the rest, there are tests that can help to gauge if the lower compression is due to ring wear. With regard to the valves, there’s a "possibility" that installing new valve stem oil seals could reduce oil leakage into the cylinder but, if the valve guide turns out to be really worn, putting a new seal on will be a very temporary measure. The bottom line is if the plug is oil fouled and a simple valve stem oil seal replacement is not likely to help, the engine will have to be rebuilt. If you want a definitive, on site diagnostic, please request a spark plug/oil leak diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Fuse keeps popping in car

After looking at the wiring diagrams for your car, I cannot find any 30 amp fuses in the fuse box location you describe. I see all different sizes up to an 80 amp. Most big ones are 40 or 50...

Car doesn't turn over. Replaced spark plugs and wires.

I would have a technician inspect your starting problem because it could be a number of things that would stop the car from starting.

Would a leaking exhaust manifold cause a catalytic converter code?

A leaking exhaust will cause excessive oxygen to get into the exhaust and cause the O2 sensors to detect this and will set a code for the leak. I suggest getting leak repaired and then recheck the system to see...

Related articles

P0125 OBD-II Trouble Code: Insufficient Coolant Temperature for Closed Loop Fuel Control
P0125 code definition Insufficient Coolant Temperature For Closed Loop Fuel Control What the P0125 code means P0125 is the OBD-II generic...
P2613 OBD-II Trouble Code: A/C Refrigerant Distribution Valve Control Circuit High
P2613 means a problem with the A/C refrigerant distribution valve control circuit which causes the air conditioning to not work properly.
P0225 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch C Circuit Malfunction
P0225 P0225 code definition Throttle/Pedal Position Sensor/Switch C Circuit Malfunction What the P0225 code means P0225 is a generic OBD-II code which indicates that the throttle/pedal position sensor/switch C circuit has an internal failure. The sensor went out of range,...