HT4100 4.1, 4.5, 4.9 Discussion, pvc valve housing possible vacuum leak? in Cadillac Engine Technical Discussion; The rubber elbow that houses the pvc valve into the valve cover seems to have a lot of play and ...
Automobile(s): 1993 Coupe Deville 2006 XLR Infrared, 2009 XLR-V Crystal Red
Orange County, CA
Re: pvc valve housing possible vacuum leak?
When they get hard over time, it may feel loose. As long as it's in the cover and you don't see crankcase blowby coming out around the elbow it should be ok. It would be possible to have a vacuum leak between the PCV and the throttle body, but would be very unlikely. Your most likely location for a vacuum leak would be one of the hoses at the throttle body which I've seen most of the time the elbow for the line going to the EGR solenoid.