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Old 10-11-2011   #1
maxima-shawn
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Clogged Pre-cats

02 157k

Replaced the main OEM cat once with an aftermarket and within a year it was clogged again so I gutted it. Now I seem to be having the same symptoms starting again. Last time I had these symtoms the rear cat was clogged. Now being that the rear cat has clogged twice I can only imagine what the 2 precats look like. I am now stuck with an expensive decision to replace them. I have thought about gutting the 2 precats as well but I am concerned with noise and performance. Will there be any performance issues? I was also thinking about purchasing a set of cheap headers. Will headers remove both precats? Any advice? Trying to get by as cheap as possible to keep the car running for another year or 2.

Thanks.
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Old 10-11-2011   #2
islandmax
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Re: Clogged Pre-cats

You can get a set of 4th or 5th gen stock headers, that way youll be able to use a fed spec y pipe.
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Old 10-11-2011   #3
DanNY
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Re: Clogged Pre-cats

why not figure out why your cats are clogging in the first place...no?

a factory car (without turbo/NO2) should not run so poorly that it will clog the cat in such a short time.
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Old 10-11-2011   #4
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Re: Clogged Pre-cats

IF you get headers they will eliminate both precats and leave just your main cat. I see alot of guys on the big org gut there precats out instead of changing them or getting headers. Gutting your precats is cheaper then getting headers.
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Old 10-11-2011   #5
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Re: Clogged Pre-cats

interested thread im also lookiing for answers ,wat i know best way to go is buyin headers ,but sorry to hack ur thread but wat headers are good
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Old 10-11-2011   #6
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Re: Clogged Pre-cats

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Originally Posted by DanNY View Post
why not figure out why your cats are clogging in the first place...no?

a factory car (without turbo/NO2) should not run so poorly that it will clog the cat in such a short time.

I agree, the valve stem seals are worn and I burn a bit of oil. Its this that fowls the cats. I'm trying to buy a bit more time to save money, pay off another debt and get next years tax return before I trade it in and buy another car.

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Originally Posted by islandmax View Post
You can get a set of 4th or 5th gen stock headers, that way youll be able to use a fed spec y pipe.

So stock 4th and 5th gen headers fit the 5.5 and have the cutouts for the o2 sensors?

Last edited by maxima-shawn; 10-11-2011 at 07:12 PM.
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Old 10-11-2011   #7
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Re: Clogged Pre-cats

4th gen headers are shortys (they dont have o2 sensor bungs), you need them to be able to use a fedspec y-pipe (you have a cali spec now). Then you can get a warpspeed y and weld 2 extra bungs into it (I can weld them in for cheap).
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Old 10-11-2011   #8
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Re: Clogged Pre-cats

Maxima-shawn, moved your thread to the IHE section.
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Old 10-12-2011   #9
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Re: Clogged Pre-cats

I believe seafoam cleans the cats outs. drop a bottle in the tank and fill it up. do this twice and see if it helps
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Old 10-12-2011   #10
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Re: Clogged Pre-cats

you can gut it all out, you will get a bad drone inside the car around 2700rpm, cheap header is an alternative, but certain ones may not fit correctly. Can you describe the problem you are having ?
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Old 10-12-2011   #11
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Re: Clogged Pre-cats

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Originally Posted by VIP Maxima View Post
I believe seafoam cleans the cats outs. drop a bottle in the tank and fill it up. do this twice and see if it helps

I was under the impression based on all my reading that one cannot clean a catalytic converter. To repair is to replace. Can you please explain the logic behind how the seafoam will work? I'm willing to try it regardless as it can only help in other ways and it's cheap.

Would someone be able to post a picture as to where the seafoam should be sucked in?

Last edited by maxima-shawn; 10-12-2011 at 06:16 PM.
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Old 10-12-2011   #12
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Re: Clogged Pre-cats

Seafoam wont clean tour cats. When used in the gas tank it will clean injectors.
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Old 10-12-2011   #13
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Re: Clogged Pre-cats

Quote:
Originally Posted by maxima-shawn View Post
I was under the impression based on all my reading that one cannot clean a catalytic converter. To repair is to replace. Can you please explain the logic behind how the seafoam will work? I'm willing to try it regardless as it can only help in other ways and it's cheap.

Would someone be able to post a picture as to where the seafoam should be sucked in?
http://www.seafoamsales.com/gasoline-engine-faqs.html

Quote:
Will Sea FoamŪ harm my catalytic converter?

No – quite the opposite. Sea FoamŪ actually helps to clean the catalytic elements, restoring its efficiency, and reducing that “rotten egg” odor you occasionally smell from some catalytic converters that aren’t working properly
for $8 a can at walmart, id give it a shot. dump a can in the gas tank and fill it up. do this treatment twice and see what happens.

Last edited by VIP Maxima; 10-12-2011 at 09:53 PM.
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Old 10-12-2011   #14
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Re: Clogged Pre-cats

^Better off putting it through the intake manifold. His cats are clogged with burned oil, not much you can do about that.
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Old 10-13-2011   #15
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Re: Clogged Pre-cats

how badly does your car burn oil?
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