LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Vacuum leak

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Old 03-17-2011, 10:49 PM
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Default Vacuum leak

So I pulled the intake to fix the oil leak that I had coming from the front of the motor, in doing so I replaced the intake and the 58mm TB, I also put block off plates in, now the car won’t idle and it backfires though the intake. Tried unplugging the MAF and the car goes to 5,000rpm and holds, next I did the carb cleaner in the TB it seem to finally find an idle, any ideas were the leak is?
Old 03-18-2011, 12:26 PM
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You can use an unlit propane torch to determine where the vacuum leak is. Just over around potential areas and observe any changes in idle.




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