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Normally caused by excessive crankcase pressure.

A blocked breather or bad piston rings are the likely causes.

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Q: What make oil cap blow off?
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Related questions

What would cause the oil fill cap to blow off while a car is running?

its loose


You were mowing and oil came out the right side of your mower on your foot the cap came off did the engine blow?

Not necessarily. If the oil filler cap wasn't on tight it could have just vibrated off. If the cap is not on the filler tube it will blow oil out of the tube with a good running engine. I would refill the oil, tighten the cap, clean up the oil spill and try the mower again to see what happens. Chances are everything will be fine.


What would make a 1994 Toyota 22 re engine to run rough when you take the oil cap off?

high milage blow by or pcv Issue


What happens if oil filter cap is loose?

Neither your oil filter, or the fill cap need to be loose, the filter should be screwed on as tight as you can get it by hand only, and the fill cap should fit snugly so it does not come off. If the oil filter is loose or too tight you can blow out the seal which will cause you lose all your oil.


Will gasoline in your oil cause your oil cap to be slightly foamy?

It can cause your oil cap to blow right off, foam around the oil cap is more likely to be water or coolant. Get it checked right away because it can damage your engine. It's usually a sign of a bad head gasket, it lets water into the oil and oil into the water. Check your radiator to see if there is oil in the water and if the water is low.


Why does the oil blow out from under the oil cap on a 1994 Jeep Cherokee Sport?

check pcv it maybe plugged


Why does engine turns off when oil cap is removed?

The engine turns off when the oil cap is removed because the engine is designed to do so. When the oil cap is removed a vacuum leak is created which causes the engine to turn off.


How do you put oil in the car?

Take the oil cap off of engine and pour in oil.


Why is oil coming from the filler cap when engine is running?

Excessive blow-by (a tired engine) and/or the PCV system is not functioning correctly. Also, check the condition of the gasket under the oil fill cap.


What would cause the filler cap dip stick to blow out on a 2003 Harley Sportster?

there is a check valve in the oil system that is stuck open over filling the oil tank will cause the dipstick to blow out of oiltank


Is there a tool needed to take off the oil cap on a 2000 ford ranger xlt?

No , not for the engine oil cap , just turn it by hand


What is an oil drill?

Look in the link I will make blow.