Skip the auto shop - Our mechanics make house calls

Q: Oil is leaking into spark plug wells

asked by on

Car started to run poorly and rough. Engine light came on took it to auto zone. Ran a test and showed number four is cutting out on engine. Pulled the spark plugs out and noticed oil in all the wells. One spark plug well thread came out. I guess gasket seals are bad?

My car has 200000 miles.
My car has an automatic transmission.

A: Hello. You are correct. There has likely be...

Hello. You are correct. There has likely been a gasket and, or grommet failure. The oil contaminates the plug and retards the spark. Hence the poor engine performance. It also causes the pressures to vary from normal and stresses out the engine. Replacing these gaskets is an easy task, but accessing them is a different story. Make sure if you are doing this at home, bag and tag everything you remove from the engine. When reinstalling, make sure you are properly torqueing down the bolts. Go ahead and replace all of the spark plugs after that. Make sure that all of the spark plug wires are clean, dry, and tight. Any contamination on these will result in similar effects.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Q: Car bogging down in gear

Hello and thank you for your question. There could be a problem with the brakes not releasing or the transmission torque converter could have failed. Check all of the brakes and make sure that they are adjusted and working properly....

Q: Air suspension system issue on 1997 Lincoln Mark VIII

Hello. Thanks for writing in about your 1997 Lincoln Mark VIII. I suggest that you have a technician test a power and ground going to the air ride relay and pump. Some particular make and model have experienced corrosion on...

Q: Dealership left oil cap off after oil change.

I would not assume anything. Have them detail the engine good and clean any oil up. Do a completely new oil and filter change and make sure the cap is installed properly. If you would rather have another mechanic take...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...