smiljko

I,m wonderng if driving with clogged cat can result with some damage-mine is clogged for sure I can hear puff noise from it when I release the gas.
Is it ok to put universal cat instead OEM(very expensive) and what with the lambda sond
Could the clogged cat be the reason I have crappy idle?

Thanks

4-RUNNIN' FREAK

I think it can cause a fire. It'll get red hot + unburned gas. As far as price, (it's an 8 year warranty) My first cat was like $1400 from the dealer, but it was replaced free. The second cat is probably the same price.

smiljko

"My first cat was like $1400 from the dealer"

Thats why I want replacement one- it's about 200$!

ctcost

Yeah it can cause alot of back pressure problems:

https://www.yotatech.com/search.php?searchid=655501

That's the main search and here are some aftermarkets you can buy:

https://www.yotatech.com/forums/show...ytic+converter

The MangaFllows work great for alot of people.

smiljko

Thanks

Godzilla

what kind of puff noise do you hear from the cat and when? do you just hear it from the tailpipe of the muffler or does the cat itself make the noise? Just curious as mine is about 12yrs old and have wondered if it is done. thanks

X-AWDriver

Geez,I bought a high flow cat for my DSM and it came in at only about $100 and I don't see why you should have to spend much more than that for a 4Runner cat.

smiljko

I think cat itself is making the noise- I can hear it when I open drivers door and push the gas pedal when I let it go I can hear puff noise which seems to becomig from the cat because it is right under the seat.
And yes, previous owner warned me that it's worn out.

runner89

I just got a new free flow cat and back exhaust with 2.25" pipe, all seams welded, for 400$. Very happy with it. Ditch the OEM and go with a free flo one.

anthony1

iTrader: (1)

man, is your cat made out of gold or something? I got high flow cat for about 80 bucks

4-RUNNIN' FREAK

They have Palladium and Platinum inside? Palladium is like one of the most expensive metals. I guess you pay for content.

X-AWDriver

I guess you got ripped off.

4-RUNNIN' FREAK

Didn't pay for mine. 8 year warranty.

Plus those metals help clean the exhaust with chemical reactions, no?

TACOMANATOR

A Catco cat will run you about $100.

photoleif

good link on the reaction.

4-RUNNIN' FREAK

So I was kind of right?

runner89

Whatever, It was a catco cat, thats also a free flo muffler, 2.25 pipe custom bent to stay high and out of the way. all the connections were welded all the way around. Now as I couldn't have done this myself, I found the price well worth it. The free flo stuff is much better than stock IMHO.

4-RUNNIN' FREAK

I have to worry about emissions here tho. CO is pretty lax, right? They are pretty strict here. It's every 4 years so in 2 tests over 8 years cars usually fail. (8 year warranty and 4 year interval tests, hummm, probably some kind of scheme) After 5 more years when there is no more emission warranty, you can bet I am getting a cheap cat.
The first cat is $1,400 dealer so the second cat can't be too much less although it may not fail as often. That first cat takes the brunt.

photoleif

yep! from what i've read recently, and recall from HS chem, a catalytic reaction is one in which there is no ultimate chemical change to the catylist, and that it facilitates the conversion of inputs into other outputs. so theoretically (with clean exhaust) a cat should last forever. in reality wet, combustible or corrosive exhaust causes problems, including making the cat run too hot, degrade or otherwise lose its lifespan.

back to the reaction: reading between the lines shows that the catylists are degraded for the duration of the reaction, and their electrons are "put back" when it's done. the common elements used for automobile cats are palladium (Pd), platinum (Pt) and rhodium (Rh). a couple of articles suggest that the choice of catylist is less important than the structure that allows the metals to contact the exhaust. another article i read showed results from a controlled study of a dual-cat system with some backpressure; it actually *raised* horsepower by a small percentage, rather than lowering it, counter to the popular belief that a straight-tube system yields the highest HP.

yeah, colorado's inspections seem to include just using a mirror to make sure the cat is present. whether it works or not is borne out by the readings of exhaust, but there's no rigorous physical inspection.

DudeBud

cheak out these cats http://www.secureperformanceorder.co...e/powercat.cfmnice and small