Question about 1998 Cadillac DeVille
Auto parts stores sell a compression testing tool which is a gauge and hose attachment. Remove the park plugs, make sure you mark the spark plug wires so that you can replace the wires in the correct location and keep the firing order correct. You attach the tester by screwing it into the spark plug hole and then crank the motor over several times. This has to be done for each cylinder. I recommend you get the Haynes repair manual on your vehicle so you have the proper ranges for compression for the cylinders and further instructions on doing this test.
Posted on Aug 07, 2010
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Posted on Jan 02, 2017
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