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Usually the valve seals or rings.
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∙ 14y ago
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What causes oil to be in the spark plugs?
Either worn valve guides, worn rings, or a holed or cracked piston.
Why do spark plugs fail?
Wear. Fouled. Cracked.
Why would spark plugs have oil on them?
Piston rings shot.
Are there spark plugs in a citroen c3?
Yes Citroen C3 has spark plugs and there are four. Spark plugs create a spark in order to ignite the fuel inside the engine's piston chamber. When ignited a pressure is built inside and this drives the piston and so the drive-shaft. For each chamber you need one spark plug and since there are 4, you need four plugs.
Where are the spark plugs in a moped?
look aroundthe piston head should be there!
Engine overheat on nissan's engine?
could be bad piston rings,are your spark plugs oily,is your carb.tuned right,your intake manifold could be leaking
Why do I have antifreeze in your spark plugs on your Crown Victoria?
Probably a cracked cylinder head.
1999 Honda Civic LX that does not start in cold weather?
check spark plugs, and spark wires, they may be cracked or dirty you may also need to replace your battery check spark plugs, and spark wires, they may be cracked or dirty you may also need to replace your battery
Why does your 86 Nissan 720 pickup keep fouling out spark plugs after you changed out the carburetour?
it could be piston rings letting oil get on them it happened to mine
Why is there oil on your spark plugs?
bad valve seals, bad piston rings bad valve seals, bad piston rings
What would cause spark plugs to crack 1990 Chevy 350engine?
The only time I've seen cracked spark plugs was putting them in or taking them out with the socket not perfectly straight.
What does it mean when you change your spark plugs and there is oil on them?
Bad piston rings or valves not seating properly.
