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A compression test is to determine how much pressure the engine makes, and a leakdown test measures its ability to hold pressure. Atmospheric pressure at sea level is approximately 14.7 psi. A 9:1 com ...

The sensor is at either the front or the back of the crankshaft, so it's usually located either on the transmission bellhousing or behind the crankshaft pulley. There should be a small air gap, usuall ...