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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 05-06-2010, 09:33 PM   #1
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Hey I have a 1998 oldsmobile lss non supercharged and was wondering if I can change the catalytic converter myself and what I need to do it any info would be appreciated thank you
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Old 05-06-2010, 09:35 PM   #2
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ZZ performance has a magnaflow free flow cat that you can use. I use it on my 97 and have no problems with SES codes. You can change it yourself, but will need to figure out how you wish to attach it. With clamps, or welded in place.
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Old 05-06-2010, 09:43 PM   #3
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Thanks but what clamps would I use and where would I cur the old one at u know the front connection is a flange
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Old 05-06-2010, 09:46 PM   #4
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You can unbolt the flange and then cut after the cat. then you can cut the flange side off on the work bench, then clamp that to the new cat and get everything set on the bench. then all you need to do is line up one end of the pipe, clamp it down and attach the flange. You can use exhaust clamps, get them at any auto parts store.
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Old 05-07-2010, 12:38 AM   #5
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Thank you dan I have found a catalytic converter with a flange already on it so when I cut behind the cat would I put the pipe coming off the cat into the resonator pipe and clamp it over the cat pipe or vice versa and how tight should the clamp be should it crush around the pipe or just tight enough to hold it
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Old 05-07-2010, 12:43 AM   #6
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Hmm, how can I explain it. As the gases move threw the pipe they should never run in to a edge of a pipe. So, the pipe at the resonator should be bigger then the pipe on the cat. Tighten the clamp so it'* just crushing the pipe a bit. Then start the engine and check for leaks. If you have a leak, tighten again.
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Old 05-07-2010, 12:47 AM   #7
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One more thing how can I tell if I have a leak the exhaust is one thing I nothing about on a car
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Old 05-07-2010, 12:58 AM   #8
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You will hear a odd sound, like a pht or a tick. You can then carefully put your hand around the seams and you would feel air moving if there'* a leak
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Old 05-07-2010, 10:07 AM   #9
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I'd search around as ZZP isn't always the best price. You'll also want to be wary and look under the car at the cat/flange. Most of the 96-99'* had the flange welded pretty much to the cat w/o any piping to work with. Clamping a flange to a cat won't work very well w/o enough piping.
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Old 05-07-2010, 10:20 AM   #10
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My advice is cut out the old cat, and have the new on welded in. I took mine to the muffler shop and they only charged me $50 to do the work and kept the old cat. They sell them off for scrap.
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