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How to do compression test?


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  • 4 weeks later...
  • 4 weeks later...

To do compression test, you need to remove all spark plug wires. Then remove one spark plug and screw the compression tool by hand, you dont need to super tight it (whatever tight done by hand is enough). Once tool is screwed well in spark plug holder inside the engine then crank the car from ignition for 30 seconds. Reading should be around 100 psi. Do this exercise for all cylinders and see readings are pretty much close to each cylinder. Variance of 5-10% is acceptable, but more than that is a problem teller.

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