Diagnosing Problems with a Vacuum Gauge

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A vacuum gauge is a valuable tool in diagnosing problems with your car. From poor performance to bad braking, the vacuum gauge can help you find the root of many problem. Mark Simpson demonstrates how to perform an accurate engine vacuum test.

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3 Responses to “Diagnosing Problems with a Vacuum Gauge”
  1. HUGO

    Shouldn’t the needle be steady? It looked in the video as if it was shaking a bit. I am in the process of testing mine and at the beginning mine was shaking as well, but I had most of the vacuum hoses connected. Then my friend recommended to test it again after caping some of the vacuum ports and I got a steady reading.

    Reply
    • Customer Service

      Hello Ralph,

      You can take a vacuum reading from any plenum port off the intake manifold (although not including, coolant passages or exhaust crossover passage).

      I have also seen some carburetor base plates for Mercury have vacuum ports for Columbia two-speed rear axles.

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Tags: classic car tips, classic car tools, classic car vacuum gauge, Free Videos, how to use a vacuum gauge, Mark Simpson