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Old Apr 20, 2013 | 03:17 PM
  #1  
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Burning Brakes
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Default Cat question

So while under my car today, I noticed that one of my aftermarket cats is discolored (brownish/bronzing color) while the other still looks silver (or similar to new).
I have aftermarket headers and a Corsa exhaust also.
Just think it is weird that one cat would be discolored like that. Almost like it is getting too hot (or something)

Any comments
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Old Apr 20, 2013 | 09:28 PM
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One bank is likely running leaner than the other, which is making that cat get hotter.
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Old Apr 20, 2013 | 11:12 PM
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and why would that happen?
it isnt like I really have any codes
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Old Apr 20, 2013 | 11:38 PM
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can happen if one of your cats gets slightly plugged or the honeycomb partly collapses... or maybe the injectors in that bank flow a little less fuel...

Numerous reasons it COULD happen...
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Old Apr 20, 2013 | 11:54 PM
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Check the condition of the plugs on that bank. If they look ok, then that bank is not running lean and you can rule fuel and spark out of the equation.
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Old Apr 21, 2013 | 12:19 AM
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Check the CAT Temp with a digital laser thermometer and see if the CAT/s are both coming up to temp. If one is COLD, its likely damaged.

Bill
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Old Apr 21, 2013 | 06:13 AM
  #7  
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are there straight through replacements?
I have aftermarket header that are connected to the cats which are then connected to the Corsa.

I figure since there isnt a sniffer test here and my car is already running pretty rich....
I could just get rid of them
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Old Apr 21, 2013 | 03:27 PM
  #8  
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Could this discolor of the cat come from a bad O2 sensor?

I have found that I have a PCM code 0430
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