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Old 01-06-2003, 02:08 PM   #1
DeusExMachina
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Member#: 13485
Join Date: Dec 2001
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Location: Denver, CO
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OMG EJ22T
FTW

Cool Running really rich..

Hey guys. I've got a question for you. I have a full Brullen headerback exhaust and Cobb intake. I drive really only street miles and get 14-15 mpg in the winter. Could these mods be making me run that rich? I have a 2002 RS.

The exhause tips are black, the car pops a lot and it stinks of fuel. Any ideas? I only hae 6.5k on her.

Also I have been having a bank 1 sensor 2 o2 sensor malunction. But last I knew the rear o2 did nada. Also I seem to be getting that code when I've been pulling a lot o Gs...bumpy bumpy roads, horrible jerking when teaching friend manual, snow donuts... :-D
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Old 01-06-2003, 02:18 PM   #2
AJ711
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2 whls > 4 whls

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Well, if the O2 sensor isn't reading the correct levels, the ECU could be dumping fuel into the lines. That would be the first place I'd look. Then, maybe a leak around the sensor or something. I've had my Brullen on since they came out, granted it's a MY98 RS, but I've never had THAT bad of gas mileage.

AJ
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Old 01-06-2003, 03:06 PM   #3
DeusExMachina
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Okay, its the rear O2 sensor, which does nothing as far as fuel ratings are concerned.

Bzzt, try again.
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Old 01-06-2003, 08:28 PM   #4
AJ711
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2 whls > 4 whls

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Round 2:

I'm thinking that the rich engine has clogged that sensor or something. Ya know, put too much carbon or something on the probe. But since it doesn't control the Air/Fuel curve, I can't be exactly sure.

Have you checked for leaks before the first O2 sensor? If more air is getting into the exhaust, it would cause more fuel to get dumped in.

Maybe try reseting the ECU and seeing what that does.

AJ
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Old 01-06-2003, 09:15 PM   #5
DeusExMachina
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Hrm..maybe I should suck it up and take it to the dealer and ask them to take a peek at it. I think I will try resetting the ECU tomorrow, and take it easy from the start. I read that I should reset the ECU and get it up to redline a bunch of times to learn it well..maybe thats why its running rich.
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Old 01-06-2003, 09:42 PM   #6
aj's25rs
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sounds wierd. is there the recall for an ecu reflash for that year? check with your dealer. i know thw 200-2001 had a problem with running to rich. adding mods doesnt help either. the intake on 200 up is known to make the rs run rich. maybe you need an afc to trim the fuel down? hope this helps
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Old 01-06-2003, 10:03 PM   #7
DeusExMachina
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Thanks AJ, anything helps. I'm getting an AFC, hopefully that helps a lot!
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Old 01-08-2003, 05:53 PM   #8
AJ711
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Any luck with things? Did the ECU reset help anything?

AJ
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Old 01-08-2003, 06:25 PM   #9
DeusExMachina
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ECU reset did nothing I don't think..I may try it again tomorrow. I'm not sure if it reset fully.

I have an oil change appt at Subaru next Thursday, I'll tell them I've been getting bad gas mileage, and to check out the O2 sensors for me.
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Old 01-08-2003, 07:48 PM   #10
iON Performance Inc
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DeusExMachina - if you're using winter gas (or gasohol) then it's quite likely your fuel mileage will go down. How was your fuel mileage like in the fall & summer?
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Old 01-08-2003, 08:01 PM   #11
DeusExMachina
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I wish I knew. I didn't pay attention to it. I thought it was all fine and dandy. Then I notice people who have similar mods, and one guy at a meet commented on my 180 mile tank in December. So I was a little concerned.
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Old 01-09-2003, 01:00 PM   #12
LordBass
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A few notes for ya Deus:

1. Black exhaust tips: Mine get the same way.. Just dirty.
2. Exhaust pops a lot.. Normal Brullen goodness.
3. Car stinks of fuel: That ain't right.

4. Take it to the dealer. You're still well under warranty and they won't slap your wrist for this.. Problem is simple: Crappy MPG. Tell 'em to get on it!

I remain doubtful that the header-back has anything to do with this. I'm getting ~21mpg this winter with nearly the identical car. (Down from ~24mpg summer, very little highway driving).

(For the rest of you, I've got the same Brullen cat-back that Deus has, sans headers & cat).

lb
www.trancelab.com
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Old 01-09-2003, 01:06 PM   #13
DeusExMachina
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Yeah, its weird. I have an appt next Thursday. I'll tell them I've been getting ~15 mpg. I dunno what I'll say if they say "Well you have an exhaust and intake, duh." Because Iknow they will.
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