I have a problem with my engine pulling a vacuum thru the dipstick of the oil fill cap. A large hissing is heard when I try to remove the dipstick(engine running) and it is very hard for the oil cap to be unscrewed when the engine is running. It is a newly built engine. I do not think its the pcv( it still does it when I unplug the pcv) . I don't have a clue what would cause this.
Nov 30, 2009 at 4:53 PM