how to clean catalytic converters?

[Allforspeed]

i have the stock H pipe off my car and am about to go smog and was wondering if there is any chemical i can use to clean out the cats since they look kind of black inside. i understand most of those "pass smog guaranteed in a can" things are just chemicals that clean out the cats.

please only people that have actually done this or know about it for sure, i cant afford to replace my cats if i ruin them so i really dont want to ruin my cats but i really want to pass smog also (california sucks


thanks!

 

[timewarped1972]

about all you can do is put the pipe back on the car, maybe put some of that stuff you see in the auto stores in the tank and drive. as far as i know the best way to really do anything for them is to get them nice and hot because thats what makes them work......

 

[Allforspeed]

i was hoping someone out there had sprayed carb cleaner or paint thinner on them to clean them and then smogged their car so i know it doesn't ruin them, i always let em get nice and hot also, that is true

thanks!
anyone else?

 

[HISSIN50]

They are a thin honeycomb matrix which clogs up. Then as they clog, they start to melt. So one would have to have loose debris in there and then backflush the matrix to get the crud back out the header side.

If they are not allowing the catalyzation to occur, they should be renewed. Now that said, I have not tried any chemicals, so let's see if people have and what they say.

Good luck.

 

[95COBRA241]

They are a thin honeycomb matrix which clogs up. Then as they clog, they start to melt. So one would have to have loose debris in there and then backflush the matrix to get the crud back out the header side.

If they are not allowing the catalyzation to occur, they should be renewed. Now that said, I have not tried any chemicals, so let's see if people have and what they say.

Good luck.

I agree 100%.

Those chemicals in auto stores don't clean the cats themselves. They probably help with combustion to "CLEAN" the exhaust before it get to the cats.

 

[Michael Yount]

Paul is correct. You shouldn't put ANY chemicals on the cats. You stand more of a chance of damaging the rather fragile catalysts that are on the ceramic matrix. If they won't do their job, it's replacement time.

 

[Allforspeed]

thanks guys, i guess just rinse it out with water and throw it on there

wish me luck with my smog adventure tomorrow!.....

 

[302RollinHard]

All that you should do to your cats is put them on and make sure that they are good and hot before you smog. I wouldn't even flush them out because I don't think that it will do anything. Most important is to make sure that your car is running right and that it is hot before you go. You should be alright.

 

[Allforspeed]

probably be fine but the previous owner put a E-303 cam i think in it with stock intake and stock heads, super stupid thing to do and it makes the car slower while also making it tricky to pass smog, sweeeet.... i think i'll be fine though i passed on this H pipe before

thanks veryone

 

[95COBRA241]

The e-cam is supposed to be emissions legal however with the right tune almost any cam combo can be made to pass emissions with cats. Besides the cats being warmed up prior to your sniff test, the car should be in good tune. If the A/F is not right, it will cause you to fail even with a stock cam and heads.

 

[Michael Yount]

Don't rinse it out with WATER!!!! Don't rinse it with anything -- Just put the H-pipe back on.....