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NVMYSVT
Veteran CEG'er

Reged: 01/06/03
Posts: 728
Loc: Wisconsin
Clogged Cat - What to do?
#1304869 - 08/23/06 12:15 AM

We recently realized that my main cat is giving me probs..

car has been running physically hot to the touch, running higher idle at start up and even clunked out once at idle, smelly as hell, smokey sooty exhaust from the tips and some smoke from the EVO vents in the hood after I get off the highway. A

Had my builder drive it around the block a few times this last weekend and his determination was that the cat was clogged..

here is little background on the car -

previous owner spun a rod bearing and let the car sit for almost 2 years in a barn.

Bought the car and we rebuilt the entire engine (currently put about 5k on the engine thus far)

Gut both exhaust manifolds because I saw bird seed inside due to the previous owner removing exhaust bolts and pulling oil pan off to inspect damage and not putting back together

Car has had a constant CEL even though we installed MIL Eliminators, replaced both upstream O2 sensors and reset the battery a hundred times (it always comes back after 2-3 restarts)

Previous owner installed a Brullen Exhaust System w/Sho Shop Y-Pipe.

My questions are these.. I'd rather fix this problem and not cause more problems down the road for myself - Gutting the main cat is free and basically pretty easy but is it a bad idea in the long run? Am I going to pollute like a mother? Will the car sound unbearable?

I've been looking at the BAT High-Flow Cat w/Y-pipe for about $320.00 - I'm not sure if I should waste the money on it especially when the car already has the Sho-Shop Y-Pipe installed.

I'd love some opinions - and better yet I'd love the car to run properly and not have a blasted CEL all the time.

thanks in advance and please be nice.. I'm a girl who owns 2 CSVTs

(BTW - SVT #2 is much faster than SVT #1 which also makes me think its clogged)

--------------------
Crispy

99 Cougar - Arancio Atlas/Grey Graphite Pearl Custom Widebody
98 CSVT - Silver Frost #4014/6535 - Born 10/21/97
98 CSVT - Silver Frost #4085/6535 - Born 11/10/97
See My Rides


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Tony2005
Addicted CEG'er

Reged: 06/19/05
Posts: 5345
Loc: Virginia, USA
Re: Clogged Cat - What to do? new
#1304877 (Re: NVMYSVT) 08/23/06 12:23 AM

Scan for CEL codes and post the exact codes. It may be sometime else besides the mileliminators. May want to consider new mileliminators if it shows P0420 and P0430. www.mileliminators.com

If it were me, I would remove Bank 1 (or Bank 2) Lower O2 sensor and see if it drives better. If it drives better, you know it is a plugged main cat. Don't drive more than a few minutes, due to hot exhaust going to who knows where (rubber tubing, wiring, etc.).

I think you can buy a "universal" main cat for about $80. Just need to weld it in (or direct fit is $175). I would not gut the main cat. Too much for the po-po not to notice. Good luck.

--------------------
"Always do the cheap and easy ones first."

1996 V6 ATX 96K miles


Edited by Tony2005 (08/23/06 12:52 AM)

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rwea14
CEG'er

Reged: 02/25/05
Posts: 154
Loc: Merrimac, ma
Re: Clogged Cat - What to do? new
#1304917 (Re: Tony2005) 08/23/06 01:19 AM

would a generic $80 converter really be able to solve a code 420/430. I have had this code now for quite some time and would do this fix in a heart beat.

--------------------
1998.5 Silver Frost SVT
#4978 of 6535
160,000 miles and still going..

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Tony2005
Addicted CEG'er

Reged: 06/19/05
Posts: 5345
Loc: Virginia, USA
Re: Clogged Cat - What to do? new
#1304922 (Re: rwea14) 08/23/06 01:28 AM

Originally posted by rwea14:
would a generic $80 converter really be able to solve a code 420/430. I have had this code now for quite some time and would do this fix in a heart beat.



No. The generic $80 main converter was suggested to reduce environmental and noise pollution (as opposed to gutted main cat).

Mileliminators ($30) are what you need to trick the PCM into "thinking" that the pre-cats are fine, i.e, send a signal to the PCM that the precats are working fine (or you could just put in new precats).

--------------------
"Always do the cheap and easy ones first."

1996 V6 ATX 96K miles


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