Cats are clogged!!!!

mustanggt3685 · Dec 25, 2005

I've been getting a damn check engine light from the rear o2 sensors, so I took the stang to my dads friend who is a certified mechanic and he said more than likely a cat is clogged up or a couple. Right now I really cannot afford to buy a new X pipe...so this is what I am thinking; get some 2.25 inch pipes and just weld the cats off and weld the pipes in. I want to leave the mufflers and all that on. Is it feasable to do this? I am looking for ideas...

1LowGT · Dec 25, 2005

took some low end grunt from mine but worked better in higher rpms,it probably wont sound great as mine didnt,i cut my pipes gutted the cats and welded them back though,sounded like crap

bdcardinal · Dec 25, 2005

get an O/R H or X pipe. you can pick them up for really cheap, especially used ones.

mustanggt3685 · Dec 25, 2005

Where can I find them used online, per say?

bdcardinal · Dec 25, 2005

diff mustang forum classified sections, ebay.

whyask · Dec 25, 2005

210 shipped for o/r x pipe with sensors from www.mustangtuning.com

jstreet0204 · Dec 26, 2005

If your cats are clogged you have another issue going on. Be prepared to fix that. The most common cause I've seen is oil leaks getting into the exhaust and baking it in there.

Mustang5L5 · Dec 26, 2005

mustanggt3685 said:
I've been getting a damn check engine light from the rear o2 sensors, so I took the stang to my dads friend who is a certified mechanic and he said more than likely a cat is clogged up or a couple.

I doubt it.

Unless your car is burning oil like crazy, or has other serious issues going on it's tough to clog up a cat.

I would bet the o2's need to be replaced. Did you ever run the codes??

mustanggt3685 · Dec 26, 2005

I have honestly not been burning oil, generally after I change the oil it can go the 3k until the next change without loosing much or anything for that matter. I am going to go "inspect" the cats myself here a little later to see if that is indeed the case.

Mustang5L5 · Dec 26, 2005

COuld just need new 02's.....they are 9 years old

mity2 · Dec 26, 2005

what code did you pulled?

tomustang · Dec 26, 2005

you feeding pellets into the heads?? kinda hard to clog cats

BlueRuckus · Dec 26, 2005

tomustang said:
you feeding pellets into the heads?? kinda hard to clog cats

Not entirely true. Had a buddy of mine with a stroker build on his truck. He used some Av gas (100+ octane) one time that really cleaned out his motor and flushed all that stuff out the exhaust and clogged up a cat. Clogged so bad that it glowed red hot when he got on the express way that night. Almost looked like neon. Had to replace it the next day.

mustanggt3685 · Dec 27, 2005

Yeah hell with it, I found a deal on an O/R H pipe, so I'll put it on when I get it. No use in screwing with these things.

jstreet0204 · Dec 27, 2005

Whether the cats are clogged or not, the o/r doesn't fix the original problem.

mustanggt3685 · Dec 30, 2005

Ok, update...took it back to him and he hooked up all of his computers and stuff and the cats arent clogged. The post cat o2 sensors are indeed crap, i.e. not working at all. He said that they are needed to optimize the a/f ratio, etc... So should I replace the 2 post car ones at like $100 each? Or do I have any other options? He also said I should sell the damn thing, but I dunno. It gives me something to do that I enjoy. I really do not mind putting the money into it, as I've saved well over the years. Opinions on that as well?

Mustang5L5 · Dec 30, 2005

$100 each?

You can prob buy them yourself froma parts store at $50 each and replace them yourself. DOn't really need to take the car to a mechanic for that.

04YELLOWGT · Dec 30, 2005

A couple of people I know have done this. One owns an 03 Cobra and he's nearly running in the
10's.

Good Luck

bdcardinal · Dec 30, 2005

the rear O2s have no effect on A/F ratio. all they are used for is to moniter catalytic converter efficiency.

jstreet0204 · Dec 30, 2005

mustanggt3685 said:
Ok, update...took it back to him and he hooked up all of his computers and stuff and the cats are clogged. The post cat o2 sensors are indeed crap, i.e. not working at all. He said that they are needed to optimize the a/f ratio, etc... So should I replace the 2 post car ones at like $100 each? Or do I have any other options? He also said I should sell the damn thing, but I dunno. It gives me something to do that I enjoy. I really do not mind putting the money into it, as I've saved well over the years. Opinions on that as well?

Glad to hear the cats were not clogged, since that would have meant you had a much bigger problem. There is no reason to pay $100, Randy Stinchcomb sells oems for $70 each, but to be honest I'd recommend running oems in the front, but aftermarkets are fine for the rear, and you can get those for less than $50 each at any autoparts store. You can tell your mechanic that the rear o2's are not needed to optimize a/f, there only purpose is to test cat efficiency. They also will not put the car into "limp mode" they will only throw a light if they malfunction, or the cats are not working.

Cats are clogged!!!!

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I like Pro3 and all I got was this crappy CT.

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