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Old 09-22-2004, 10:25 PM   #1
sixiron
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Join Date: Jul 2004
Location: hickory, nc
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03 legacy se s/w
white

Angry exhaust soots up my white bumper cover

my 03 legacy wagon (white) is being slowly disccolored with black soot on the rear of the bumper cover after the stromung s/steel exhaust system was installed a couple of months ago...first it wasn't too bad but the more miles driven the more soot deposits ....seems like I have to wax and clean the rear facia every 2-3 days to keep it off....tried search on several sites for a s/steel extension but no luck with finding what I need...31/2" x 12" would get the exhaust out past the rear facia...
anyone have same or similar problem ....tks bd
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Old 09-22-2004, 10:49 PM   #2
rabbitnutz
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do you have hollowed out or non functioning cats?

i ahev never heard of this happening with properly functioning cats.....try using some seafoam in the PVC vaulve to clean the system out...at the very least, it should reduce the amount.
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Old 09-22-2004, 11:06 PM   #3
Slack
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I noticed this happening to mine recently. I thought it was because I had an exhaust leak (cracked borla headers) causing a lower temp reading in the O2 sensors and the ECU was leaning out the air/fuel mix. But, I could be just making a wrong assumption and not know what I'm talking about.

I have a high-flow cat and it has never caused this problem until now. Of course, I could be due for a new PCV. They are supposed to be replaced every 15k miles, according to Subaru.


Mick
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Old 09-23-2004, 12:20 AM   #4
Al_Smokemcrack
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Try the simple stuff first. Reset your ECU. It's wonderous what that can do sometimes.
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Old 09-23-2004, 12:22 AM   #5
Al_Smokemcrack
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Quote:
Originally Posted by Slack

...I could be due for a new PCV. They are supposed to be replaced every 15k miles, according to Subaru.


Mick
Every 15k? Whoa! Is my experience with PCV's odd, or is a PCV that lasted 135k in an Escort whacked? Honestly, I don't think I've ever seen a PCV gummed to replacement. Does Subaru expect something more than "shake it; if it rattles, it's good?"
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Old 09-23-2004, 01:57 AM   #6
Slack
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That's just what Subaru says. I have only changed mine in the 60k+ miles I've owned it. That is why its called "PREVENTIVE maintenence". You should replace things before they wear out, not when they do. When they wear out it causes undue wear/stress on your car which leads to the car not lasting as long as it could have.


Mick

Ps- And no, I'm not trying to sound like Captain Obvious.
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Old 09-23-2004, 07:46 AM   #7
sixiron
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I have stromung s/steel midpipe and single tip muffler 21/4" ...3rd cat was eliminated by the ss midpipe...other cats are stock...car has 11K now...only other mods are a PDM intake, amsoil panel filter , perrin stock pulley, & grounding kit...

I'll reset the ECU again ,
never heard of seafoam..will search to find...can't hurt
thanks guys
bill
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Old 09-23-2004, 09:57 AM   #8
jamesfacts
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Also, you might want to try these:

[img] http://www.allwheelengineering.com/b...boy/KB-011.jpg [/img]

Kartboy longer exhaust hangers.
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Old 09-23-2004, 12:45 PM   #9
jeffg
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Or the stainless steel bumper trim piece. I know STI had it for the WRX, it might work on a Legacy.
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Old 09-23-2004, 05:19 PM   #10
White2.5GT
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Quote:
Originally Posted by sixiron
I have stromung s/steel midpipe and single tip muffler 21/4" ...3rd cat was eliminated by the ss midpipe...other cats are stock...
bill

That "3rd cat" is acutally a resonator thats there to dampen resonace in the exahust. Removing it will not cause the rich condidtion that you seem to have...
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Old 09-23-2004, 07:05 PM   #11
Kostamojen
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Its probably getting soot because the exhaust is too far underneeth the car, IE the exhaust isnt far enough away from the bumper...
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