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Message: <blockquote data-quote="e34_lover" data-source="post: 653401" data-attributes="member: 16259">unstopables, do you know if they did a wet compression test as well to confirm that it is the valves and not the piston rings? A leakdown test will also help pinpoint your problem area by finding out where the leaks can be heard. If it truely is a bent valve, you will hear hissing in either the intake or exhaust.If the mechanic is right about the valve being bent, then something must have happened. I don't think that a bent valve would allow the car to run as well as you said it does. Is your car auto or manual?I am leaning more towards piston rings on that cylinder because your car isn't showing any symptoms of a bent valve. Try to see if you can do a wet compression test and let us know the results. A wet compression test is done by putting a little oil into the cylinder and testing compression. The oil will help the rings seal a little and should show better compression on that cylinder.Hope this helps!</blockquote>