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2004 Impala LS 3.8l

Tiny
AIR NITRO
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 109,000 MILES
2004 chevy impala ls 3.8l.I replaced the upper intake along with the lower intake gaskets. In ran fine for two days, now its making a high pitch noise at idle and driving.I looked it over then I pulled the oil fill cap off it made a vacum sound the it stopped. What is this?
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Saturday, December 4th, 2010 AT 2:13 PM

1 Reply

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
It's normal to have vacuum crankcase to burn fumes as part of clean air. Your pcv valve is the sucking instrument but the breather must be plugged causing high vacuum and noise.
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Sunday, December 5th, 2010 AT 6:41 AM

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