The leakdown tester is less common, and you need to get a good one to do the test properly. A compression test is to determine how much pressure the engine makes, and a leakdown test measures its ...

Compression testing is another good tool to use when diagnosing an engine. Combining the results of a leak down test with a cranking compression test can indicate an engine's potential.

Compression If everything above has failed to diagnose the issue, use a compression tester to test the compression of your engine. Low or no compression could prevent the car from starting.