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.

Oil is leaking into spark plug well Inspection $79.99 - $99.99 Get a Quote

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.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

my '65 F 100 lurches only when driven slowly. asked by Sandy W on January 21, 2017 My '65 F100, 4 on the floor, lurches when I

Hi there. In most cases, the lurching problem is due to the forward running clutch pack is not engaging until pressure is high. You will need to have transmission rebuilt to repair the transmission. Since you have an older truck,...

How can I replace malibu 2013 spark plug?

Hi there. Removing rear spark plugs on many modern engines can be very complex. Most of the time, removing ancillary components like coil packs, air intakes and other components will significantly help you complete this task. I would recommend that...

Wrench light came on truck has no power and the rpms constantly get higher if put in park

Hi there: The wrench light is service light indicator that alerts the driver that maintenance or service is due for a component. Most of the time, scan that Auto Zone will complete uses a basic scan tool, which does not...

Key won't start ignition - 2006 Honda Civic

Usually, when the steering wheel is turned to one direction, locked, it won't turn and neither will the key, the steering wheel is just jammed. To release it, turn the wheel in the direction that it will move just...

Knocking noise while braking

Hello. This noise could be coming from the lower ball joint, lower control arm, the strut, or the strut mount. It would be a good idea to have a certified technician, like one from YourMechanic, complete an inspection in order...

Vibrations in steering wheel and warning lights on

A vibration over 50 mph generally indicates a balancing issue. It would be recommended to get these tires road force balanced. Otherwise undesirable wear patterns and tire noise can develop. The BAS/ESP light may indicate a problem with the brake...

What do the various MyKey® status messages mean?

While the MyKey® system lets you create keys with specific restrictions (for use by drivers just getting comfortable with responsible driving, for instance), it can be problematic at times. The system can be hard to understand at times, so let’s...

Related articles

P0319 OBD-II Trouble Code: Rough Road Sensor B Signal Circuit
P0319 means the vehicle's crankshaft position changed due to defective, disconnected, or missing rough road sensors.
P0164 OBD-II Trouble Code: 02 Sensor Circuit high voltage (Bank 2, Sensor 3)
P0164 P0164 code definition Trouble code P0164 is set when a high voltage condition is detected on the bank 2 sensor 3 oxygen sensor circuit. What the P0164 code means This code means that the powertrain control module has...
The 10 Transmission Problems to Never Ignore
There’s nothing quite like transmission problems to stress out the average car owner. They are, at best, inconvenient and, at worst, very expensive. Proper...