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Old 07-23-2008, 11:37 PM   #1
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My VX has no Catalytic apparently. Am I wasting gas?

Hey everybody, thanks for taking time to read this post. I appreciate it.


I bought the car from a 22 year old kid who apparently put headers and put an aftermarket exhaust wit the big pipe type muffler.


I replaced muffler with stock one and added the resonator thing by muffler.


But muffler shop guys said I have NO catalytic. Would charge $150 to install.


Would any muffler shop cat be fine or should I get OEM Honda for max MPG?


Am I wasting gas with no Cat?


Am I missing any O2 sensors since I have no cat?


Thanks guys..sorry for being a novice. I am not auto mechanically
knowledgeable. Just know basic maintenance on cars.


But looking to get max mpg for my VX. Thanks again.
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Old 07-24-2008, 04:26 AM   #2
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You are not wasting gas, but your car is polluting more than it should be. Get a cat installed. Plus, even if there are no emissions inspections if it is found out that you are operating with emissions equipment removed youcould be fined. I have seen roadside inspections before where the state police visually inspect vehicles, and issue citations for missing equipment. I would say that the O2 sensor is probably still there, as the fuel injection system needs it to calculate the a/f mixture.

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Old 07-24-2008, 06:08 AM   #3
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If I understand common emissions systems correctly, there could definitely be one or two O2 sensors missing. There are sensors before the cat and after the cat; the ones before the cat are used for air/fuel ratio measurement, and the ones after the cat are compared to that to make sure the cat is working correctly.

If the cat is removed the system should throw a code and light up the Check Engine Light (CEL), either because the post-cat O2 is missing or because the pre-cat and post-cat O2s measure the same. Obviously if one is missing that would do it too. If there's no CEL, then the post-cat O2 may have been replaced with an electronic O2 sensor simulator (I think they're called an "EFIE").
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Old 07-24-2008, 07:08 AM   #4
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I'd make sure to get the stock VX manifold and cat...it mounts the cat right on the front of the motor Honda seemed to do this on its FE cars so they must have had good reasoning behind it...you might be lucky and score one on a local care forum since people ditch them for a header...if you have some tools and simple automotive experience you could save some money and install it yourself (http://cgi.ebay.com/ebaymotors/96-97...spagenameZWDVW) this is similar, I imagne for the $150 your mechanic is just gonna weld in a $30 universal Cat, if you want to go that route just order one from summit and go to an exhaust shop, they would probably charge you $50 or so to weld it into your exhaust...if you could take a picture of your current header, there should be an O2 sensor mounted on it, hopefully the previous owner didn't ditch it...you'd probably have a CEL if they did...GL
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Old 07-24-2008, 07:17 AM   #5
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If you are losing economy anywhere in that system, it's in that big exhaust with fart can muffler.

Leave the header, put the cat right after it and don't run an exhaust after that any bigger than 1.5", straight through is preferable.
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Old 07-24-2008, 08:47 AM   #6
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Quote:
Originally Posted by dkjones96 View Post
If you are losing economy anywhere in that system, it's in that big exhaust with fart can muffler.

Leave the header, put the cat right after it and don't run an exhaust after that any bigger than 1.5", straight through is preferable.


I think that's the best solution.
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