"Parmas" Motor

[cali yaris]

A proper test that would have determined the condition of this engine is not a compression test, its a leak down test.

Read Rob's post, a compression test can tell you a lot, and IS one "proper" test for the condition of an engine. A leak-down test is also a proper test.

[cdydjded]

Originally Posted by cali yaris

Read Rob's post, a compression test can tell you a lot, and IS one "proper" test for the condition of an engine. A leak-down test is also a proper test.

Yes they are both proper test & the compression test is done before the leak down. But the compression test cannot pinpoint the problem like the leakdown can. A compression test tells you about your engine's ability to generate cylinder pressure, and a leak down test tells you about it's ability to hold pressure. Another way to think of it is that with a compression test you are seeing how much pressure the engine creates, and with a leak-down test you are seeing how much pressure it loses. So if while doing the leak down you have air blowing out the exhaust you have an exhaust valve issue, out the intake you have intake valve issue & out the pan is a ring problem.