Diagnosing Problems with a Vacuum Gauge

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Duration:   2  mins

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 problems. Mark Simpson demonstrates how to perform an accurate engine vacuum test.

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4 Responses to “Diagnosing Problems with a Vacuum Gauge”

  1. Patrick Larscheid

    Good video and nice chart. Downloaded the chart and printed it out. Going to have it laminated.

    • 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.

      We’d love to have you be a part of our community. We are convinced you will enjoy the benefits of becoming a member and having access to the best instructional how to videos and professional tips. We would like to offer you a special promotion for your first year membership.

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      Classic Car Restoration Club Video Membership

  2. 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.

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