Skip the auto shop - Our mechanics make house calls

Q: Oil leaking into spark plug valve.

asked by on

I have oil leaking into one of my spark plug valves. The Service Engine Soon light is also on.

A: Hi, this comes up often on this car. The sp...

Hi, this comes up often on this car. The spark pug tubes go through the valve covers on this engine due to the placement of the spark plugs. The seals that go on the valve cover to seal the tubes from the oil in the valve train tend to get old and they crack over time. When this occurs oil will get into the tube which will contaminate the spark plug wires and cause a connection issue to the plugs themselves. This will then cause a misfire which causes the engine light. The valve cover gasket and seals will need to be replaced, and it is a good idea to replace the plug wires and spark plugs though they can possibly be cleaned up and reinstalled if they are in good shape. If you are not comfortable with replacing this you should get the assistance of a mechanic, like one from YourMechanic.

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: Mileage for spark plug service

Hi there. Your 2013 Toyota Tacoma has a mileage interval change for the spark plugs at 60k. You're right at the interval change for your spark plugs. If you'd like to get this serviced, YourMechanic has several available technicians that...

Q: shifting problems and the vehicle will not go backwards. Plus it will try to lunge forward in park.

Hi there. What could be the issue is the main valve to the transmission may have disconnected from the shifter lever on the side of the transmission. Raise up the vehicle and put it on four (4) jack stands. With...

Q: I have an issue with my Honda City 2004 AC

The problem sounds like you may be having an A/C clutch cycling out due to being low on refrigerant. Another possibility is that the system is overcharged and is putting a large load on the engine, and then kicks out...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...