- May 11, 2010
Yes a differential test. 100 line air 90 psi on the in side and 85.5 and 84 on the out.I asked if it was just the bad side as I was thinking cracked head, especially if it is worse when hot, could you try a compression test when the engine is hot?
When you say compression test, are you doing a leakdown test?
But 90 psi you will get a leak from a crack.
5% loss isnt all that bad but and it is ring loss not valves.