V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

V6 vacuum test

Old 11-12-2018, 03:27 PM
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Car: Pontiac Firebird Formula
Engine: 3.1 LH0
Transmission: 700R4
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V6 vacuum test

As mentioned, how can I perform a vacuum test? I connected the hose of the tester as shown in the pic, am I doing all right? The tester measured about 7 psi, I think itís too low!

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Old 11-24-2018, 05:49 AM
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Re: V6 vacuum test

You should hook the vacuum line directly to the manifold with a single hose, no tee's. I'm not sure where that line goes to. Use a vacuum port that does not affect the running of the engine.You should have a vacuum gauge that reads to 20 hg . The one you have only goes to about 15 hg. Idle readings should be between 16 to 20 hg.
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