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You would get high CO's (unburnt fuel) @ idle and @ high speed, Depending on how bad and how many vales are leaking. It would fail most smog tests. You could do a compression test to see whitch cylinder is low. Hope this helps, Ben Parker, San Jose, Ca.

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โˆ™ 2006-09-16 02:55:56
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Q: How does a burnt exhaust valve affect emissions?
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