Thread: Compression
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#12: 01-05-2013, 11:08 PM
Title: Contributing V.P.
Location: Milwaukee
Car: 99 Legacy 2.5GT Toyota Supra 2jz/R154
Posts: 1,048
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You know that doing a leak down test is better then a simple compression test. You can rent them from your local auto parts store. With a LDT you can figure out the percentage of leakage, plus when you have compressed air in each cylinder you can figure out if its the rings or either intake or exhaust valves. Simply set the cylinder at TDC and hook up the LDT to the spark plug hole. Fill with air and listen for the leak, if you remove the oil filler cap and you hear air hissing then it's your rings. If you can hear air hissing in the intake manifold then intake valve and same with the exhaust, remove the header and listen for air hissing.