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Random Tech Cat problems...HELP!

 
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Old 04-03-2009, 07:29 PM
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Random Tech Cat problems...HELP!

Alright, I replaced my Cat and O2 sensor about 6 months ago with a Random Tech Cat... now i throw a CEL again and Honda says the cat is clogged!?!? has anybody else had a problem with a Random Tech cat???? Honda says there doesn't seem to be anything wrong with the engine itself, but if not, how did i go through a cat in 6 months?!?!
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Old 04-03-2009, 08:38 PM
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Re: Random Tech Cat problems...HELP!

Im havin a problem with my cat as well, i just replaced mine yesterday with a magnaflow performance catalytic converter, and today my check engine light came on, and the mechanic said its because its not the exact model for my car, so im thinkin about buying a damn code scanner, and each time the engine light comes on for the cat ill just clear it. Im not gonna throw away the 75 bucks i spent for the converter and buy a 130 walker converter..
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Old 04-04-2009, 01:55 PM
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Re: Random Tech Cat problems...HELP!

alright, so i got the offical report back from honda today, and it says that my "long term fuel trim off" .... what does this mean??? and can it be fixed to save my cat?
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Old 04-04-2009, 06:52 PM
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Re: Random Tech Cat problems...HELP!

stock header???
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Old 04-04-2009, 06:58 PM
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Re: Random Tech Cat problems...HELP!

no, it's a megan 4-2-1 header
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Old 04-04-2009, 07:02 PM
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Re: Random Tech Cat problems...HELP!

well, you're getting more air flow....through your exhaust pipes...causing the primary and secondary O2 to read the same.....here's a link to fix your problem.....

http://www.civicforums.com/forums/79...simulator.html

let me know if this helps out....peace....
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Old 04-04-2009, 07:15 PM
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Re: Random Tech Cat problems...HELP!

ok, so that would just make it so the O2 sensor doesn't stick into the downpipe at all? or very little.. is that right? Which O2 sensor would that be done to, and what exactly would it accomplish? I'm kinda new to this, so i'm trying to understand exactly what i'm doing to my car... thanks.
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Old 04-04-2009, 07:48 PM
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Re: Random Tech Cat problems...HELP!

yeah, that would make the O2 sensor be back off a llil bit...it would be put on the secondary O2 sensor. doing that would make the secondary O2 read a lil less than the primary O2 sensor. and thats what you want. i have it on mine when i had a Megan header. i was getting the CEL, i tried 2 cat...and that CEL never went away till i tried the non-fouler trick...didn't get the CEL back...
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Old 04-05-2009, 09:28 PM
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Re: Random Tech Cat problems...HELP!

so if all this does is make it so i don't throw a CEL, then how do i actually fix the problem??? I brought the car in to the shop in the first place bc it's putting out black smoke on hard acceleration.. They said it was a clogged cat, but if you're saying it's just this, then how can i make it not run so rich that i have black smoke?
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Old 04-05-2009, 09:41 PM
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Re: Random Tech Cat problems...HELP!

well....our h22a4 engines runs on the rich side out of the factory....you're gonna get black smoke on hard acceleration....with the megan header..yo're getting more air flow thn stock flow causing your O2s to read the same....try th trick and see how it runs...
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Old 04-05-2009, 10:04 PM
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Re: Random Tech Cat problems...HELP!

h22a4turbo, you've done a good job of explaining it so far, but let me help everyone out here a little bit more because I've seen this asked many many times.

Your CEL on is on because when you put the random technology cat in, it is not as efficient as your stock cat. Let me explain what this means. Your stock cat was a little more restrictive and used a more-dense core. Inside the dense core, it had elements of either platinum or pallidium. These are two incredibly rare and expensive metals, which is the reason why a stock cat for the Prelude (or any car for that matter) can cost upwards of $600.

The purpose of those metals is to "catalyze" (see: bond) carbon monoxide molecules together and form a less poisonous oxide, carbon dioxide. Your car has two oxygen sensors, the first one is the main one that the computer is going to read. It will tell the engine computer what the air/fuel ratio is and the engine computer will automatically adjust the amount of fuel the fuel injectors are injecting into the combustion chamber to start equalizing it in search of that perfect ratio for fuel efficiency, power, and emissions.

Your second oxygen sensor is mandated for emissions reasons to check and make sure your catalytic convertor is working properly. If it becomes clogged or disintegrates, the engine computer reads the signal of the second sensor and determines that it's not within normal parameters and then will throw a CEL to get your attention. Then it will retard power production as a means to take away your fun until you get it fixed so Honda doesn't look bad having cars driving around without a cat or with a malfunctioning cat. Federal regulations make it so on all car companies as part of the Clean Air Act.

So the proper solution is to get the simulator. A simulator will trick the computer into thinking all of the parameters are normal and from keeping the CEL from coming on. The moment a CEL comes on, usually the engine retards all timing to make it run safe no matter what and you'll lose the power you crave. And to answer your question, yes, the simulator does go on the second (closest to the muffler) oxygen sensor. A local tuning shop should/could be able to do this for you for very cheap.

Best of luck, I have ran Random Technologies Catalytic Convertors for over 5 years and have had wonderful results with them, even passing a Texas emissions test. They are probably the best replacement cat you can get, just short of a real OEM cat. They do not really clog because the substrate (the tiny honeycomb looking insides) are very porous, moreso than OEM cats and will rarely, if ever, clog.

Just get the simulator and you'll find your problems will likely never come back.
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Old 04-05-2009, 10:14 PM
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Re: Random Tech Cat problems...HELP!

thanks akaprepreludesh....but the non-fouler trick works the same way....have it on my now and just passed NC emissions test with flying colors....

speedyb....i would go either way...doesn't cost much for either one....
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