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Old 02-16-2005, 05:29 PM   #1
Kostaman
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Join Date: Oct 2002
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2003 WRX sedan
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Default Cat back exhaust causes inefficient Cat????

Anyways,

After getting rear ended on marine drive a couple months ago, my check engine light has been turning on and off almost randomly. After taking it to Jonny at advance and getting it diagnosed, i found out that my cat is damaged. He tells me to take it to Don Docksteader and mention to them that I got into an accident that could have possibly damaged my cat.

So after Subaru checks it out... they also conclude that my cat is running inefficiently, but they tell me that it's because my exhaust it too big. Now I'm confused... i'm no car buff, but i know that air leaves the exhaust pipes one way..... out the back of the car no? If that truly is that case, then how can a larger exhaust cause my cat to run inefficiently.

Perhaps it's another case of stiff the man with the aftermarket modifications? Or I ****ed up somewhere?? Any help would be appreciated.

.....or.... does anybody who's running catless right now want to sell me their cat possibly for cheap?
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Last edited by Kostaman; 02-16-2005 at 05:34 PM.
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Old 02-16-2005, 05:34 PM   #2
madmanslegacy
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Go catless?My kids should have black lungs like the rest of them!
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Old 02-16-2005, 05:39 PM   #3
Kostaman
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Perhaps... I bought my car late 2002, when's the first time i need to go to aircare? Will I pass with a faulty cat? I probably won't pass if i'm missing a cat im guessing.
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Old 02-16-2005, 05:49 PM   #4
bwco
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kosta, your inefficient cat code might be caused by the rear O2 sensor.
If CEL flickers frequently, i guess it must be that sensor cause I'd the same thing with my bmw before (bmw with custom 3" cat back exhaust). Replacing a rear O2 sensor would be an easy job.
Buy the O2 sensor and do it yourself or I'll help you in your garage.
By the way, I kinda suspect that your exhaust leaks somewhere in the front too.

anyone guessing otherwise?

DON'T GO TO ADVANCE AUTO ! **Labor cost gonna kill you
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Old 02-16-2005, 05:53 PM   #5
Kostaman
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yeah, i'm gonna take it back to parks today to see why the exhaust rattles too... u said before that maybe the axleback part isn't bolted flush with the middle pipe? i dunno.. thanks billy
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Old 02-16-2005, 07:23 PM   #6
Marty Gagnon
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Quote:
Originally Posted by madmanslegacy
Go catless?My kids should have black lungs like the rest of them!

you might as well sell your car, move to Kyoto and buy a Horse.
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Old 02-16-2005, 07:35 PM   #7
bwco
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Quote:
Originally Posted by Kostaman
yeah, i'm gonna take it back to parks today to see why the exhaust rattles too... u said before that maybe the axleback part isn't bolted flush with the middle pipe? i dunno.. thanks billy
no i didn't say that.
I heard the hissing sound from your exhaust before you got it fixed.
My guess was a leak anywhere from the turbo. Could be the downpipe or midpipe. Also, you remember that your car got pushed in the front too? Just a little impact may cause the exhaust mainfold to leak. So, get the entire exhaust mainfold> uppipe> uppipe bung> downpipe> downpipe sensor bung> center pipe> midpipe> midpipe sensor bung> axle back fully inspected (well, just by looking or feeling of the gaps is good enough if your really have a leak)

Don't quote me on the leaking part, cause I'm no expert in cars. All i can do is oil change.
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Old 02-16-2005, 08:15 PM   #8
-S-
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Quote:
Originally Posted by Marty Gagnon
you might as well sell your car, move to Kyoto and buy a Horse.
Ah yes, because Kyoto has the cleanest air of all world cities? And why stop at horses? Use those fat legs! Don't you know horses pollute?
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Old 02-16-2005, 08:48 PM   #9
RDS
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If you change the exhaust flow (larger exhaust and free flowing muff.) it may set a cat eff. code because the cats are designed to run on the stock flow.
If they can not keep up with the exhaust , the Rear O2 sensor will see the out put of the cat is not correct. Try the stock exhaust and see if the light still comes on. Good Luck
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Old 02-16-2005, 09:06 PM   #10
madmanslegacy
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Quote:
Originally Posted by Marty Gagnon
you might as well sell your car, move to Kyoto and buy a Horse.
Good idea, im guessing since you live in TO, you've already considered this.
Oyeaah, the topic: Take bwco, and RDS's info.

Last edited by madmanslegacy; 02-16-2005 at 09:11 PM.
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