1997 Buick Park Avenue massive vaccumethrough oil fill hole

1997 BUICK PARK AVENUE
147,000 MILES • 6 CYL • 2WD • AUTOMATIC
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KENTLOVIN
  • MEMBER
  • 1 POST
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
Mar 8, 2010 at 1:42 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 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.
Mar 19, 2010 at 5:04 AM
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