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Originally Posted by mike561
would another symptom of a bad cat converter be a loud rattleing/clunking noise comming from under the car also?? my dad's 00' blazer is doing that and it got me wondering...
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It is possible to get that type noise from a CAT. Also check for any visible damage to the CAT or exhaust system if you have an SUV you take offroading. Another symptom is a funny smell like burning plastic. Another is the CAT will glow cherry red indicating temperature exceeding the standard 1200 degrees F.