Thread: engine miss

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Originally posted by firebird77clone
to diagnose a bad exhaust valve :

Have an assistant rev up the engine, then release the throttle suddenly. When the throttle is released, cover the exhaust with your hand ( obviously, don't do this with a hot exhaust ). If you have a bad exhaust valve, you will feel your hand sucked in when that cylinder hits the intake stroke.

check the compression, that will tell you everything you need to know about the valves. if you have good. comp. then you can move on.