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Compression tests are often done to monitor the condition of a car’s engine, along with the valves and other internal components. If your car isn’t running as well as it should, the test can indicate that one of the components has begun to wear out. Performing the test doesn’t require much mechanical experience and can be done at home with a compression gauge. If you get an unusual readout from one of the engine’s cylinders, then you know where to look for problems.

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Before you can perform a compression test on your car’s engine, you’ll need to run it for 5 to 10 minutes to bring it up to its normal running temperature. Next, switch off the engine, remove the fuel pump, and disconnect the spark plugs. Attach the compression test adapter into the cylinder nearest the front of the engine, then connect the gauge to the other end of the adapter hose. To perform the test, crank the engine 4 times by turning the key in your car’s ignition, then check the compression gauge for the result. After you get a result for the first cylinder, repeat the process for all of the other cylinders. To learn more, including how to interpret your test results, keep reading! Did this summary help you?YesNo

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This article was co-authored by Matthew Rava. Matthew Rava is an Auto Repair Expert and the Co-founder & Head of Marketing of Brakes to You. He specializes in auto repairs that concern brakes. Matthew earned a BS from West Chester University of Pennsylvania. There are 8 references cited in this article, which can be found at the bottom of the page. This article has been viewed 365,977 times.

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