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Pontiac Firebird 1967-2002 Birds of a feather flock together

Diesel

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Old 03-06-2014, 09:23 AM
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My car sounds like a diesel in the morning. Almost like a light knocking (under load, accellerating, not on idle). Oil pressure and level is fine. Gas is high test. After about 15-20 minutes of driving its better. Any thoughts?
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Old 03-06-2014, 05:59 PM
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Search for "piston slap".
Somewhat common with LS1s, arguably harmless.
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Old 03-06-2014, 06:54 PM
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Definitely piston slap.
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Pontiac Firebird 1967-2002
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A few pics of my 67 after paint




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