Catalytic converter clogged - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-02-2007, 07:10 PM   #1
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Default Catalytic converter clogged

My catalytic converter was clogged up so cut it it off and put a straight pipe on. Im still experiencing the same problemsas before. This includes power loss and stalling at high RPMs. I am thinking possibly that I am not getting enough back pressure without the Cat. Has anyone else tried a str8 pipe in place of the cat?
Thanks,jon
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Old 04-02-2007, 08:08 PM   #2
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I have a straight pipe in place of my cat right now because it started rattling. It runs just fine, although I didn't really drive it much before the removal, but no stalling or shortage of power by any means.

I am, however, going with a magnaflow high flow cat as soon as possible for two reasons... #1 it is not legal to run without a cat, #2 no cat makes the exhaust sound almost "ricey", especially without a resonator.
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Old 04-02-2007, 08:54 PM   #3
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If you are experiencing the same issues then the cat wasn't your problem.

Have you checked fuel pressure?
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Old 04-02-2007, 08:59 PM   #4
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I suspect fuel pressure as well. Check it.
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Old 04-02-2007, 09:09 PM   #5
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Get a cat back on. The short time I ran without one on my 95 L67, I noticed a distinct loss of low-end torque. This backs up the experiences of other members here.

And find the root cause too. Fuel pressure sounds like a good place to start.
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Old 04-02-2007, 09:17 PM   #6
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I had the same problem........................

+1 on the fuel pump!!!
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Old 04-02-2007, 10:09 PM   #7
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If you have a low pressure issue, before jumping right to fuel pump...first thing to check would be the fuel filter and change it if you have no idea if or when the last time it was changed. a clogged one can kill a fuel pump prematurely. also be sure to check the fpr for fuel in the vacuum line.
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Old 04-03-2007, 12:59 PM   #8
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Default fuel pressure

Its a good idea to run fuel injection cleaner once in a while to keep the pump pickup screen and filter / injectors working properly. I like to do it when changing the oil.
If you have not changed the filter recently its probably time to do so.
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