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Air sucked in through oil cap?
I have a BMW E36 316i. When the engine is warm there is a loud squealing noise from the engine bay. If I remove the oil cap or pull out the dip stick there is a massive contant rush of air being sucked into the engine and the squeal stops. The diapham is also split! Any ideas what it could be?
3 Answers
- Anonymous1 decade agoFavorite Answer
It's a crankcase ventilation problem. There is always a connection between the inlet manifold and the engine crankcase this is controled by a valve and yours isn't being controlled, hence the sucking and yes this diaphragm may be the problem.
- 1 decade ago
you should have negative crankcase pressure ie the oil fumes are sucked in to engine to be burnt of, there is usually a restricter on the pipe connecting to your air intake manifold.
- bobwebLv 71 decade ago
Replace your Positive Crankcase Ventilation (PCV) valve and make sure the oil cap is air tight.
