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Old 06-16-2009, 10:15 PM   #28 (permalink)
Christ
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
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Pasta - '96 Volkswagen Passat TDi
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Clogged/burned cat could cause serious loss of power, overheating, etc..

Disconnect your exhaust before the cat, fire it up, and rev'er up a bit... see if it stops that from happening.

If it does, remove the cat completely, and shine a light through it. You should be able to faintly see light at the other end. Do it in a dark place, so you'll see better. Shake the cat while it's off... if anything rattles, it's bad, unless the rattling noise is just the heat shield.
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