Just as the tittle says what would be some symptoms of a faulty cat or how would the car react? Thanks.

 

Discoloration from excessive heat, rattling (coming apart inside), should throw a P0420 or P0430 code...

 

ok thanks alot.

 

If it's clogged the car will stumble and run like ***, and may develop exhaust leaks around the header and collector gaskets, or AIR/EGR if you still have 'em.

Most muffler shops can do a pressure test to see if there's PSI building up in front of the cats.

When my stock ones went I had bad rattling noise and little silver flakes in the exhaust that glittered in the sunlight.

Rob (Bad30th)

 

honeycomb crap might come out of the back, banging/vibrating, like stated run like crap

 

I would check with a local dealership because i just got a recall notice in the mail regarding my 01 WS6 saying that if the cats were faulty they would be replaced by GM...

 

GM has always replaced them free under the federal emissions warranty for 8yrs/80K - the letter is not a "recall" they just acknowledge the issue and extend the warranty on the 00-02 F cars. Haven't gotten mine yet but read it on line - third paragraph starts with "This is not a recall" in bold letters. Good deal if you're still running stock cats.

 

Yeah thats why I just brought this up. I just got the letter today and was just wondering what I should be looking for because I like free stuff.

 

when u get a new set.....go ahead and gut them before you put them on

 

Yeah, I've got the same letter... I had my d.s. replaced at about 50,000. All it does is extend the service on them from 80k miles to 120k or 10 yrs from when the car was put in service. I wouldn't waste my time taking it in unless the codes mentioned above have shown up, b/c they'll probably just turn you around... Don't worry though one of them will go bad eventually, just keep that in a file for your records, I have heard of people getting screwed by the dealers under 80k having to pay for this not knowing that they should of been replaced for FREE!

 

yeah mine just threw those above codes relating to left and right catalytic effiecieny and i just got the mail today. Good deal.. But plan on running no cats in the spring anyway. Qtp lt's and ory