I have searched the internet but can not find the answer. All web sites state a "normal" engine's vacuum, at idle, is ~ 17 to 21 inches at the intake manifold. But, all these examples are for cars with one manifold connected to at least four cylinders. I am trying to diagnose a flat four with four venturis and individual intake manifolds. When I attach the vacuum gauge under a single venturi it produces rapid swings from zero to 20. Do I need to connect all test ports together to smooth these readings out or is this the problem? TIA Ken |
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