OK,But could it really detect the difference between the power of a 150psi compression stroke and a 220psi stroke? (assuming that there actually is NO electrical misfire)
This must be a very high compression engine,as if i'd got a reading of 150psi on all 4 cyls i would not have thought there was a compression problem.
Car behaved well again today, i just know as soon as i give it back they'll be on the phone again.
Colin.