Will a clogged cat ruin your top end power? - 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 03-14-2007, 04:29 PM   #1
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Default Will a clogged cat ruin your top end power?

I can't remember...
Also, could it cause a bad idle? I'm gonna be changing it out this weekend, so I want to know what to expect.
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Old 03-14-2007, 04:36 PM   #2
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well that can be one of the things it can do, but other things can make those problems as well.

Like Low Fuel Pressure.
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Old 03-14-2007, 04:39 PM   #3
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What he said.
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Old 03-14-2007, 04:40 PM   #4
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yeah.....

Guess I have to face the music....



Oh boy, will this be fun
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Old 03-14-2007, 04:42 PM   #5
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This should not be to hard to find whats wrong, Get a Fuel pressure Gage and Check it. someone in Ohio should have one you can barrow.

And also, Have you Ever changed your Fuel Filter?
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Old 03-14-2007, 04:47 PM   #6
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FWIW when I had a clogged cat, the car got slower as it got hotter.
Might not be the case always but thats what happened with me.
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Old 03-14-2007, 04:47 PM   #7
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I'm pretty sure I changed it in August when I did a full tune-up, but I'll check that when I'm down there. I'll just buy a pressure gauge from AZ, it can't be that expensive...
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Old 03-14-2007, 04:48 PM   #8
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There like $25-35

I would see if you can Barrow one first. its hard to return something that smells like Gas

and to test it right, you need to Mod it
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Old 03-14-2007, 07:00 PM   #9
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if your gonna get a gauge, you need to extend it so that you can SEE it while driving
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Old 03-14-2007, 07:12 PM   #10
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Quote:
Originally Posted by 95naSTA
FWIW when I had a clogged cat, the car got slower as it got hotter.
Might not be the case always but thats what happened with me.
Same here... This was the reason I replaced mine

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