2000 Chevrolet Impala high pitch whistle

2000 CHEVROLET IMPALA
100,000 MILES • 3.4L • 6 CYL • 2WD • AUTOMATIC
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MADABROSIS
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  • 1 POST
Even with drive belt off engine makes high pitch whistle. Pitch changes when you step on the accelerator. Changed head gasket and put new plugs on. Any ideas?
Mar 31, 2015 at 11:13 AM
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HMAC300
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  • 48,601 POSTS
check for a vacuum leak or air duct or grommet bad causing an air leak.
Mar 31, 2015 at 12:12 PM