Basic Engine Diagnosis
The leakdown test again proved that the No. 1 was especially weak, but ideally we would like to have seen no more than a 10 percent leakdown on any of the cylinders. You should be able to isolate the cause of a problem cylinder by listening for escaping air. We heard air escaping when we removed the 305’s oil fill cap, a sure sign of ring blow-by. If it’s audible in the exhaust pipe, suspect an exhaust valve. Think the intake valve isn’t sealing properly? Listen for air blowing out through the carb/throttle body. If you detect bubbling coolant, bet on a poorly sealing head gasket. View Related Article
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