[AT] Old test for a bad valve?

[Warren F. Smith]

There are many with more experience, but I've held a flap of paper over the
exhaust and it should "pop" out in time with the engine. If you have a leaky
exhaust valve it will "suck" to the pipe when that particular valve should
be closing. So, it can indicate a valve problem, but not necessarily which
valve.

ymmv,
Warren

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