The important item to consider is the difference between each cylinder. As we stated above, the generally accepted number is above 100-psi. You can refer to a service manual for your vehicle year, make, and model to determine what the numbers should look like. Once you’ve completed all the cylinders on your engine, you’ll want to review the numbers. Record this maximum number on a piece of paper per each cylinder and complete this step on each proceeding cylinder. This should allow the maximum compression reading to appear on the gauge. Ask someone to help you by having them crank the engine over with the key several times over a period of 3 to 5 seconds. It’s best to start with the cylinder closest to you and move towards the back, then follow on the other side (if applicable) until you’ve completed each compression test.Ĭrank the engine for short periods. You’ll want to test compression on an individual cylinder basis. Install your engine compression gauge into the first spark plug hole. Make sure to disconnect them from all plugs then remove all spark plugs. This disables the ignition system and fuel delivery system, which ensures the engine does not ignite during the test.ĭisconnect spark plug wires. You should also remove the fuel pump relay switch and the electrical connection to the coil pack. To complete a compression test, the engine needs to be shut off. If you complete a compression test on a cold engine, the reading will be inaccurate.Ĭompletely shut off the engine. Piston rings, valve seats, and other critical components are designed to expand as they heat, which creates the desired compression ratio inside the engine. Warm up your engine to operating temperature. Always refer to the recommended instructions for each compression tester you use to ensure accuracy. If you are thinking about completing a compression test, there are 5 important, general steps to follow to ensure it’s as accurate as possible.
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