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.
4 Responses to “Diagnosing Problems with a Vacuum Gauge”
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13:37
Repairing a Windshield Wiper Motor
Proving that more can go wrong with a car sitting still than when it is driven regularly, components that are lubricated with 50-year-old grease can often fail and become inoperable. Mark Simpson digs into a vintage wiper motor to determine why it stopped working, then cleans, inspects, and re-lubricates the windshield wiper motor gear assembly.
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Custom Autosound
Adding modern sound to classic cars used to involve cutting up pristine factory dashboards to get everything to fit. But thanks to manufacturers like Custom AutoSound upgrades have become a lot easier. Dennis Gage is joined by Ryan McDonald of Custom Autosound as they discuss the many audio solutions including hidden audio systems that can…
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5:38
Install a Cruise Control Wiring Harness
It’s time to do the under dash wiring for the cruise control system. Brent Ackley recommends using the instruction manual to tell exactly which wires need to get tied to other wires. After the wiring is done, Brent installs the cruise control switch and shares why they chose the style that they did.
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8:29
Classic Car Restoration Process: Bench Soldering Dashboard Components
Brent Ackley and George Vondriska walk you step-by-step through a classic car restoration process of bench soldering dashboard components for a 1956 Chevrolet 150, teaching you how to properly wire the components and connect the terminals. They show you a sample schematic for a standard component, and emphasize that each one will be different, so…
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Good video and nice chart. Downloaded the chart and printed it out. Going to have it laminated.
What about a flathead Mercury motor, master cylinder is under floorboard?
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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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.