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Besides the quick and dirty test I mentioned before, the Haynes manual for

my daughter's Honda has a slick test using a manifold vacuum guage. Warm up

the engine and note the idle reading on the guage. Rev the engine to about

2000 rpm and let it stabilize, then watch the guage when you release the

throttle. If the guage drops quickly and returns to the idle reading within

2 seconds, the exhaust is clear. If the guage appears to hang for a moment

or very gradually returns to the idle reading it indicates blockage.


Mike


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