Compression test is normally used to determine (partial) condition of engine Leak down test is normally used to determine what's the fault with engine but it will also give you leak down number that can be used to determine (the same partial) condition of the engine. Like a compression test, a leak down test is accomplished by replacing a spark plug with the tester hose Unlike a compression test, a leak down tester has two gauges and requires a compressed air source. We’ll break down the differences between leak down tests and compression tests, explain how to perform them, and help you understand the results so you can keep your engines running strong.
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