94 Viper right sidepipe overheating and melting sill plate under door. Any ideas as to why this is occurring

TEALLIFE

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replace the cats, its time anyway and new ones perform better.

replace 02s while youre there if you havent.
 

Sedonut

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Catalytic converter, too many people never let their cars warm up, driving to cars and coffee two miles away is not enough. Mine did the same thing before I fixed it.
 

vprtech

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Typically an overheating cat is caused by an excessive amount of unburnt fuel getting into it, this could be caused by a stuck fuel injector or a misfire on one or more cylinders. In my experience, the most common cause of a misfire on a Gen1 Viper is faulty plug wires, if a spark plug boot fails, and the spark arks through the boot, causing a misfire.
 

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