Q: Oil leaking into spark plug valve.

asked by on January 13, 2016

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

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?
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

Won't go over 25 and found antifreeze all over but cannot find where it's leaking from.

Hi there. Check all around the engine compartment for the coolant leak. Look at the radiator, over flow tank, radiator hoses, water pump, heater hoses, intake, core plugs (freeze plugs), and the heater core. One of those areas could be...

Engine Overheating after 20-30 minutes. Why?

Hi there. One of the easiest ways to test a water pump is to carefully place your hand on the lower radiator hose while the motor is running. Two things should happen; first, as you suggested, the hose should feel...

Intermittent airbag service light

Fault codes need to be read out of the SRS system to determine the cause of the Air Bag Light being illuminated. One common cause could be a faulty seat occupancy sensor. These are used to determine the firing logic...

Related articles

Symptoms of a Bad or Failing Fuel Return Hose
If your car has a carburetor and it gets flooded, fuel is leaking, or the car smells of gas, you may need to replace the fuel return hose.
How to Buy a Good Quality Valve Cover Gasket
When When you open the hood of your car to take a look at your engine, you'll find it is kept safe with a valve cover. What keeps this valve cover in place and not moving around is the valve...
What Causes an Exhaust Manifold to Crack or Leak?
Your car has two manifolds – an intake manifold and an exhaust manifold. Both serve essential purposes, but the one most likely to...