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hi i have a 1984 Chevrolet Cavalier Base L4 - 2.0L vin P 122ci - TBI GAS OHV that had a bad oil leak only when the car is on. what causes this to happen? and how do i fix it?


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There are a lot of things on an engine that can leak oil when running. Mostly a blown gasket. Check the valve cover gasket. That is the cover on the top of the engine.

Another possibility is the oil pressure switch for the warning light. There is full engine oil pressure at that switch, so if bad it will cause a very bad oil leak whenever the engine is running.
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