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Old 03-21-2011, 10:41 PM   #1
Jmrothrock29
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2002 SL2
Default Catalytic Converter?

Ok i have a 2002 Sl2 with 230 K the cat is OE Unfortinatly i have Ca Emissions on this car Meaning i Have A Pre Cat as well as a rear My Q Is if i rod out the front cat and Replace the Rear only we dont have emissions here were i live if i do this Might i Get A Ses Light any input would be greatly aprecited on this

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Old 03-21-2011, 10:58 PM   #2
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Default Re: Catalytic Converter?

Assuming you mean replacing the rear cat with a non-CA one, the front O2 sensor does not monitor catalyst efficiency, so I cannot see an issue with causing trouble codes.

However, may I ask why you are clearing the pre-cat? Is it for increasing exhaust flow/performance?

If so, the empty chamber on the exhaust manifold will most likely cause an unpleasant sound. I would suggest swapping in a different manifold.

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Old 03-21-2011, 11:58 PM   #3
Jmrothrock29
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Default Re: Catalytic Converter?

i'm suspecting the precat is plugged BUt i am not yet ready to condem it until i get around to rechecking the compression in the engine the car is just running realy slugish so i'm just needing to weigh my options and no i was going to get a 49 state cat that is Ca emissions Just Not Carb compliant

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Old 03-22-2011, 04:53 AM   #4
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Default Re: Catalytic Converter?

'00-'02 got the dumb precat setup regardless of CA emission package or not. Might be able to find a 9 bolt '99 manifold without the precat but that might screw with the AIR system.

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Old 03-22-2011, 10:36 AM   #5
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Wrench Re: Catalytic Converter?

Cleaning out the pre-cat should have no effect upon the front O2 sensor operation because the sensor is pre-pre-cat. To badly misquote Raul Julia in Gumball Rally: "what is behind it does not matter". No codes should result unless something else is wrong (leaks are the most common culprit).

It will also make no unusual or objectionable noises unless you are listening to it with a stethoscope or something like that, in which case you probably shouldn't be doing that in the first place. Don't waste your time and money on a different manifold IMHO, put it toward the cat replacement instead.

However........ Replacing the main cat with something less than it was intended to be could cause an issue. The rear O2 sensor monitors its "efficiency", basically meaning that it looks to see that there is a pre-determined base level of clean up from pre-cat to post-cat, or better. So if you put in a cat that is not operating at the same level of "efficiency", you could get the code for "low catalyst efficiency". FWIW, if you have CA emissions, I'd suggest that you put a CA-type cat on it. But it can be a "universal" type (weld-in) to save money if you wish. Try Magnaflow. Worked for mine.

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Old 03-22-2011, 10:57 AM   #6
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Default Re: Catalytic Converter?

If you suspect a plugged cat take out the front o2 sensor and go for a drive. if it is the cat it will run fine with the sensor out

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