Leak down test.. Accurate?.

[turquise1]

Originally Posted by upallnight

If you hear the air coming out of the exhaust pipe you have a bad exhaust valve. If you hear the air coming out of the intake system such as the airbox or throttle body you have a bad intake valve. If you can hear the air coming out of the oil dip stick you have bad rings. A compression test of that cylinder compare to the other cylinders will tell you the health of your engine.

Thanks for your quick response but my question was mostly about reliability of the test. I can hear the air leak but really can not tell where it is coming from. I could not feel anything from the exhaust, oil dipstick or throttle body..


Interestingly I tested cylinder 2 without rotating the engine (cylinder 2 is not supposed to be at TDC at that point) and I only got a 15% loss there..



Thanks,


Ozzie