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Old 05-01-2009, 09:26 PM   #1
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Default Can i remove one converter?

I have an 02 SSEI. The front converter has gone bad. The second converter has the sensor screwed into it. Can I replace the front one with a straight tube without screwing up any sensors or messing with the computer? Any suggestions?
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Old 05-01-2009, 09:48 PM   #2
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Are you talking about the catalytic converter? You can't legally remove those. If you do you will throw a SES light.
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Old 05-01-2009, 11:42 PM   #3
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Yes, the catalytic converter. It has two...one right behind the other. The second one in line has a sensor screwed into it. I thought maybe with the first one only removed it wouldn't cause any problems but I don't know. Putting legalities aside, besides making the service engine soon light come on, will it cause any problems?

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Old 05-01-2009, 11:44 PM   #4
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You have two cats? Hmm, you should have only 1. Let me PM another moderator and see what he has to say.
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Old 05-01-2009, 11:48 PM   #5
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Is it possible the second one is the resonator?
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Old 05-01-2009, 11:54 PM   #6
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Well I assume it'* two cats. The first one is small and is right up front where the pipe turns down and starts back. It has a flange on the down pipe that the converter bolts to. The outlet of the converter is welded to a pipe that goes about 1 1/2 to 2 ft. long and is welded to the second converter. The second one looks more like a muffler but it has the sensor screwed into it. Then the pipe goes on back and splits into two mufflers at the very back. Does that make sense? It'* the first converter that is rattling....very bad.
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Old 05-01-2009, 11:56 PM   #7
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That second one is the resonator. the sensor is the rear O2 sensor. Removing that can be done but can make the exhaust tone become raspy.
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Old 05-02-2009, 12:03 AM   #8
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You're saying removing the resonator can be done or the converter? If the resonator is removed, what do you do with the o2 sensor?
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Old 05-02-2009, 12:06 AM   #9
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From the down tube you should have a flex pipe, cat, resonator and mufflers in that order. Pre cat systems were never installed on the Pontiac'* as far as I can tell, but other makes and models have a pre-cat and then the final cat (2004+ Ford trucks are a good example).

It'* sounds like either a heat shield or your flex pipe/down tube might be cracked or bad.
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Old 05-02-2009, 12:14 AM   #10
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Honestly I don't know what you mean by a "pre-cat" system.
I don't see a flex pipe, just solid exhaust pipe. I've felt around all of the heat shields and everything seems tight. I used a hollow pipe, held it up to the cat and listened and you can very clearly hear a rattle inside like somethings loose.
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