Hi there,
The crankcase is vented via the PCV. If this is blocked you will have problems, but with the mileage on your car, it might be a case of worn rings causing the excessive pressure build up. Check the valve first and if ok, you can do a cylinder air pressure test (not a compression test) to determine ring blow by.
Mark (mhpautos)
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Tuesday, December 25th, 2007 AT 2:27 AM