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Old 29 Oct 2011, 04:46 pm
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Default What will happen to my 2002 Honda Accord if i open the catalytic converter & dump the contents and

put it back?
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Old 29 Oct 2011, 04:54 pm
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Default Re: What will happen to my 2002 Honda Accord if i open the catalytic converter & dump the contents a

If your state is checking emissions you may not pass the state inspection. If you install a delete pipe and keep the converter handy then you can reinstall it before the inspection. The car may also drop a DTC about the loss. So you would have to pull the batt for 5 min to clear it after the reinstall and then drive 25 miles or so for the system to reset and have a history bank.
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Old 29 Oct 2011, 05:01 pm
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There will be no increase in engine power. Check engine light will come on. Your car will fail emissions test. You will have to install a new cat. You will become poorer. People will shake their heads.
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Old 29 Oct 2011, 05:16 pm
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Boomerangst is exactly right - nothing good, lots of bad. Your car is made to work with the catalytic converter. Other bad things will happen if you do the same thing to other random parts of your car; some will be more expensive to fix, some will be less expensive.
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Old 29 Oct 2011, 05:31 pm
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just replace the catalytic converter, its old enough that is probably overly restricitve at this point, idk if i would just try to dump it, though i dont see how it would be that big of an issue as long as you dont screw with the o2 sensors. to simply dump it out doesnt seem like it would do anything, however to try to clean it with any prduct would probably be bad. idk see about simpily replacing it with a fresh one,

also, as far as boomerang and gainging power, well sure its not persay a gain in power, but it woul;d be less resrictive, which would result in a gain, well not so much a gain, but more less undoing the loss from the clogged cat.

here let me show an example, blow at you hand with nothing in the way, you can definatly feel the air, now do it with a strainer in front of your hand, you can still fell the air, however it is now impeded and the flow charcteristics are no longer as they were being entirely open, now add on 10 years of dirty air flowing through that, and you can see the strainer would definaly become more restricivice right? well that is the general example of you cat. 10 years old= clogged, thus a new cat, would have better flow characteristics+ better breathing engine= more power, though it may be minute(and when compared to the car when it was new, you more less just getting some of the lost power back) i would like to add that it is a very small amount of ower you gain here, but every bit helps, besides, when the engine breathes better ie; is less restricted, you gain power and fuel economy
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Old 29 Oct 2011, 05:46 pm
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Is the catalytic converter bad? If so then replace it. The computer in your car carefully monitors all the sensors located both on the engine and in the emission system and gutting the catalytic converter will set engine codes and cause the engine to be less efficient because it is not getting good readings from the sensors.

And as already mentioned if you have emissions testing in your area the emissions equipment has to be in good working order in order to pass the test.
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Old 29 Oct 2011, 06:01 pm
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I'm curious on why would you want to do this in the first place?

Number one, the catalytic converter has some rather nasty chemicals that may be hazardous to your health, so it's not a good idea to do that for safety reasons.

Number two, fiddling with the cat converter will probably affect your driveability and may make it difficult for your car to pass an emissions test (if you are in the US). Remember your car has a computer that computes the mix of fuel and air based on many sensors and a technician can check how the engine is running, if it's misfiring, by plugging in a diagnostic tool into the car's OBD (on board diagnostic) port. Yep, the cat converter is part of that mix and altering it may affect the car's performance, and not usually in a positive way.

Number three, generally catalytic converters are not user-serviceable components - if they go bad, they're simply replaced with a new one.

So I would strongly advise against altering or removing a CC.
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Old 30 Oct 2011, 05:56 pm
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Default Re: What will happen to my 2002 Honda Accord if i open the catalytic converter & dump the contents a

if you hollow out your cat. the car will pop a p0420 cat efficiency code but performance will not be affected. the pcm only looks at the downstream o2 sensor to verify that the cat is working so it can flag an emissions code if need be. it has noting to do with the adjustment of fuel trims. thats all done by the upstream o2 sensors on the engine side of the cat. however you wont make it through deq
why do you want to hollow it out? a magnaflow or other high flow aftermarket cat are not that spendy and some even come with clamped on fittings so theyre easy to install and that would be a better choice than hollowing out your cat

Last edited by rocketcivic94; 30 Oct 2011 at 06:02 pm.
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