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High crank case pressure is caused by "Blow By" (Exhaust Gas bypassing the Compression rings on your pistons a little blow by perfectly normal) There will be a valve like a PCV valve in your Valve cover. Its probably faulty, replace it. may be plugged, change it.

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Q: What causes high crankcase pressure on a 1996vw golf 1.8 liter gas engine?
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Where is the crankcase pressure sensor on a cummins isx engine?

In crankcase filter box


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Excessive revving of an engine causes overpressure in the crankcase. It causes unhealthy expansion in the pistons and the valves.


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