2004 impala ls 3.8l

2004 CHEVROLET IMPALA
109,000 MILES • 6 CYL • FWD • AUTOMATIC
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AIR NITRO
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  • 1 POST
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 ?
Dec 4, 2010 at 6:13 AM
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FIXITMR
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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.
Dec 4, 2010 at 10:41 PM
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