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Pontiac Forum: 3.4 lower intake warped BAD whistle. HELP
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Old January 7th, 2019, 09:18 PM
Laundry2002guy Laundry2002guy is offline
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3.4 lower intake warped BAD whistle. HELP

Installed new upper and lower intake gaskets on a 2004 Grand AM 3.4. Everything went well until I went to go start it. Huge vacuum whistle.! Long story short the upper intake plenum was cracked by cylinder number 3. After disassembling it again and putting a straight edge across that there's about .030 difference between 1 and 5 with three being lower on the lower intake. Any ideas ???
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Old January 8th, 2019, 12:07 PM
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melsg5 melsg5 is offline
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It's cracked and warped and has to be replaced. I assume it is plastic? Dorman makes one out of aluminum
1971 GTO 455 HO Ram Air
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