1997 Buick Park Avenue massive vaccumethrough oil fill hole

Tiny
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

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 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.
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Friday, March 19th, 2010 AT 12:04 PM

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