exhaust soots up my white bumper cover

sixiron · 09-22-2004, 10:25 PM

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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rabbitnutz · 09-22-2004, 10:49 PM

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.

Slack · 09-22-2004, 11:06 PM

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

Al_Smokemcrack · 09-23-2004, 12:20 AM

Try the simple stuff first. Reset your ECU. It's wonderous what that can do sometimes.

Al_Smokemcrack · 09-23-2004, 12:22 AM

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?"

Slack · 09-23-2004, 01:57 AM

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.

sixiron · 09-23-2004, 07:46 AM

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

jamesfacts · 09-23-2004, 09:57 AM

Also, you might want to try these:

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

Kartboy longer exhaust hangers.

jeffg · 09-23-2004, 12:45 PM

Or the stainless steel bumper trim piece. I know STI had it for the WRX, it might work on a Legacy.

White2.5GT · 09-23-2004, 05:19 PM

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...

Kostamojen · 09-23-2004, 07:05 PM

Its probably getting soot because the exhaust is too far underneeth the car, IE the exhaust isnt far enough away from the bumper...

09-22-2004, 10:25 PM	#1
sixiron Scooby Newbie Member#: 66376 Join Date: Jul 2004 Location: hickory, nc Vehicle: 03 legacy se s/w white	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 * Registered users of the site do not see these ads.

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09-22-2004, 10:49 PM	#2
rabbitnutz Scooby Guru Member#: 51940 Join Date: Jan 2004 Chapter/Region: NESIC Location: boobs?	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.

09-22-2004, 11:06 PM	#3
Slack Scooby Specialist Member#: 17548 Join Date: Apr 2002 Location: Atlanta, Ga	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

09-23-2004, 12:20 AM	#4
Al_Smokemcrack Scooby Specialist Member#: 66640 Join Date: Jul 2004 Chapter/Region: Tri-State Location: Rochester, NY Vehicle: 1997 Legacy Outback Glacier White	Try the simple stuff first. Reset your ECU. It's wonderous what that can do sometimes.

09-23-2004, 01:57 AM	#6
Slack Scooby Specialist Member#: 17548 Join Date: Apr 2002 Location: Atlanta, Ga	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.

09-23-2004, 07:46 AM	#7
sixiron Scooby Newbie Member#: 66376 Join Date: Jul 2004 Location: hickory, nc Vehicle: 03 legacy se s/w white	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

09-23-2004, 09:57 AM	#8
jamesfacts NASIOC Supporter Member#: 51282 Join Date: Dec 2003 Chapter/Region: Tri-State Location: Brooklyn NYC / Danbury CT Vehicle: 98 RS black & blue from parking	Also, you might want to try these: [img] http://www.allwheelengineering.com/b...boy/KB-011.jpg [/img] Kartboy longer exhaust hangers.

09-23-2004, 12:45 PM	#9
jeffg Scooby Guru Member#: 2958 Join Date: Nov 2000 Chapter/Region: NWIC Vehicle: 2001 WRX (GC8)	Or the stainless steel bumper trim piece. I know STI had it for the WRX, it might work on a Legacy.

09-23-2004, 07:05 PM	#11
Kostamojen Scooby Guru Member#: 2272 Join Date: Sep 2000 Chapter/Region: BAIC Location: haha XD Vehicle: 95 L AWD LIFTED!!! 1970 Subaru FF-1 Coupe	Its probably getting soot because the exhaust is too far underneeth the car, IE the exhaust isnt far enough away from the bumper...