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2 cats?

 
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Old 12-06-2010, 03:40 AM
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2 cats?

I recently just bought a 92' prelude, has a H23A. It has a history of failed emissions tests. 8 to be exact. so when the guy went to do the etest again to make the transfer, it failed again... three more times. Then it passed. so i was curious what these guys did that the owner previous to them couldn't do to get it to pass. I look under the body, and saw something questionable. There's 2 cats. does the 92' prelude originally have 2 cats or did they just stick it on so it wold pass?

Would this affect fuel economy?
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Old 12-06-2010, 10:17 AM
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Re: 2 cats?

there arent 2 cats the first one is the cat, connected to the exhaust manifold/header, and the second one is just a resonator
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Old 12-06-2010, 01:55 PM
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Re: 2 cats?

Oh well. As long as it passed, your fine.
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Old 12-06-2010, 02:08 PM
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Re: 2 cats?

someone i know just welded 4 cats together to get there skyline to pass emissions. needless to say it worked XD
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Old 12-06-2010, 03:22 PM
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Re: 2 cats?

Probably just a resonator.
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Old 12-06-2010, 10:58 PM
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Re: 2 cats?

If it wasn't passing then it's possible that they did fit a second cat. Though the second cat's efficiency would be questionable, since they work best when hot (which is why they are always right at the end of the header) and the first cat would absorb most of th heat. From factory there is a single cat, then a hot dog type resonator.

But no, despite constant calls from many people that cats are way too restrictive, from the driver's seat you won't notice a difference in performance and at the pump the difference would be negligable.
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Old 12-07-2010, 02:03 AM
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Icon2 Re: 2 cats?

Why did it fail before.. High co2?
Is/was the Check engine light on?

U sure it's two cats? They look identical? If they did install 2 cats then I would still try to find out and fix why it wouldn't pass without them

I don't have emission tests anymore
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Old 12-08-2010, 12:09 AM
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Re: 2 cats?

it failed due to high number on the "NO ppm" category.
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Old 12-09-2010, 04:02 PM
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Re: 2 cats?

Mmmm... Check it egr valve

It's usually your cat or egr

Maybe the original cat went bad and they didn't feel like taking the old one out lol
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