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Guest Message by DevFuse
 

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2nd Cat Missing


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3 replies to this topic

#1 trooperjeep

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Posted 03 November 2003 - 06:39 PM

Hi All,

Although I asked this question in a different thread, I wanted to post it to the gorup.

The 2nd cat-converter is "missing" on my 92 Loyale and has been replaced with a straight pipe (must have been removed by the previous owner) but I was wondering if it will effect performance (for good or bad) and back pressure.


:-\
T.J.

#2 Nug

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Posted 03 November 2003 - 06:54 PM

If it was clogged, It will increase power (unless the front cat is clogged, too). It might make the exhaust louder.
If neither cat was clogged, then I doubt you will notice any power increase, but the noise increase, if any, might make the car seem faster.
My $0.02

#3 trooperjeep

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Posted 04 November 2003 - 10:17 AM

How can you tell if the front cat is clogged?

What about the inside of the muffler? Do they ever clog or go bad? I thinks it's still the origional muffler.

:cornfuzz:
T.J.

#4 Nug

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Posted 04 November 2003 - 10:51 AM

If there aren't gaping holes in the muffler, then it's still good. They don't clog, unless it's with chunks of cat guts.

To check cats for clogging, or for high backpressure-get a vacuum gauge. They actually have backpressure gauges, but they cost a LOT! Hook a vacuum gauge to manifold vacuum. Start the engine. Observe gauge, should be between 18-25 or so, inches.
Rev to 2000 Rpm. Gauge should drop off, and return to nearly where it was before. If the vac never returns, or it does and starts tapering down, it's indicative of a restriction in the exhaust system.
Hope this helps you out. Are you looking for lost power? Cuz I think they forgot to put it in at the factory:)




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