cat removal - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-12-2007, 01:17 AM   #1
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Default cat removal

I have a '92 SE that I want to remove the cat on. I had a '98 z28 that I did this on and my check engine light came on and stayed on because of the O2 sensor. The check engine light doesn't light up on all cars when you remove the cat, I removed cats on three '93-'94 z28'* and I had no problem with the check engine light. Does anyone know if my check engine light will come one when I remove my cat from my 1992 SE?
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Old 03-12-2007, 01:30 AM   #2
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Do not remove it. It is illegal, and punishable by law. There are many people on this forum running 12'* and 13'* with high flow cats, with no problems. Plus if you remove it, you will lose a noticeable amount of low end power.
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Old 03-12-2007, 01:36 AM   #3
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It should only come on if you have a second O2 sensor located right after the Cat.

You can buy a plug in module to fool the PCM if you do.
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Old 03-12-2007, 01:54 AM   #4
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He doesnt have a 02 after the cat..that wasnt a Series 1 thing.
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Old 03-12-2007, 08:35 AM   #5
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Default Re: cat removal

Quote:
Originally Posted by tbosu1998
Does anyone know if my check engine light will come one when I remove my cat from my 1992 SE?
No, it will not trip a code on any of the pre-OBD-II cars. They don't have the 3rd O2 sensor after the cat to check the cat'* performance and report problems.

I was of the school that hollowed out the cat (busting the brick). These days, stock cats are less likely to plug up and better than stock flowing replacements are cheaper. So now I leave them in. Same reason the Air Injector pumps are no longer on cars, the cat technology got better and the ECM can alternate rich and lean mixture to keep the brick oxygenated without the need of an external pump putting air into the exhaust gas stream.
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Old 03-12-2007, 09:07 AM   #6
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Removing a CAT from a 92 Series 1 L27 will KILL your low-end torque. You'll be quite unhappy, and it is illegal.

Leave it on.
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Old 03-12-2007, 12:19 PM   #7
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So if I remove the cat from my 95 I will get a code?
What about performance?
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Old 03-12-2007, 01:18 PM   #8
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Quote:
Originally Posted by alexcoqui
So if I remove the cat from my 95 I will get a code?
What about performance?
You will not get a code or light, as 96 was the first year for the O2 behind the CAT. You will lose some low-end performance.
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