I’ve been chasing what I think is a vacuum leak. I also noticed oil in left air filter housing. So I took apart pcv system and noticed this big hole/tear in rubber cap that goes on pcv oil separator.
Would this create a vacuum leak AND/OR not put a vacuum on crankcase to help keep pressure buildup?
I assumed at idle, the high vacuum is opening the PCV valve, which creates a vacuum in the crankcase.
But if the rubber boot is leaking, then it is sucking in outside air instead of crankcase fumes?
Oh, what may have happened, two weeks ago I pulled out my newish Fram pcv and put old one back in.
Together with patching rubber boot this morning, I also put back my newish Fram PCV this morning. Could that have changed the idle?
Kirbert
(Author of the Book, former owner of an '83 XJ-S H.E.)
6
Yep, that’s what did it. Supposedly the Fram PCV valves function totally differently and not as effectively at preventing crankcase leaks. Advise you clean up the OEM PCV and reinstall.