1997 Buick Park Avenue massive vaccumethrough oil fill hole
KENTLOVIN
MEMBER
1997 BUICK PARK AVENUE
6 CYL
2WD
AUTOMATIC
147,000 MILES
My car pull a big vaccume through the oil fill when car is running it also runs rough when the cap is off smooths out when closed
Monday, March 8th, 2010 AT 9:42 AM
1 Reply
JACOBANDNICKOLAS
MECHANIC
109,755 POSTS
THat is normal if the PCV is working properly. It is designed to suck out pressure in the crankcase. If you open it, you create a leak. If the pressure was blowing out, that would not be good.