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Old 03-21-2003, 06:57 AM   #1
karl_hungus
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Member#: 7507
Join Date: Jun 2001
Location: Windsor, Ontario
Vehicle:
2002 WRX Wagon
PSM

Unhappy Why am I running so rich??

My car recently seems to be running very rich. I have a Greddy A/F gauge and while granny driving I usually stay quite lean... 14s to 13s on the gauge mostly with the occassional trip into the 11s and 10s when I get on the gas.

Lately I'm usually in the 12s to 10s range even under very light throttle with trips into the 8s and 9s. The car also seems to be idling a bit rough and has had 2 instances where it didn't want to start.

My major mods include Brullen header-back, Cobb CAI, and Yoshio tuned ECU. I'm on my second front O2 sensor and am wondering if its starting to crap out on me again.

Any insight would be appreciated.
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Old 03-21-2003, 04:07 PM   #2
joefocker20
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It could be your o2 sensor, since Yoshio should have tuned the car to not runas rich..
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Old 03-21-2003, 05:39 PM   #3
karl_hungus
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Ya thats sort of what i've been thinking too.

I wonder if its possible to find out if the O2 is failing. Does anybody know if there is any diagnostics the dealer can do or something I could check through the OBD II with a scan tool?
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Old 03-21-2003, 05:41 PM   #4
joefocker20
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Are you getting any CELs or piss poor gas mileage?
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Old 03-22-2003, 04:26 PM   #5
karl_hungus
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On the highway my mileage is good but around town its terrible.

No CELs either...
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Old 03-22-2003, 10:02 PM   #6
goobie
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Default ECU Tuned correctly?

Quote:
My major mods include Brullen header-back, Cobb CAI, and Yoshio tuned ECU.
Well even though MY00+ RS's tend to run a little rich (Mine seems to as well) Your ECU has been tuned. Maybe you should talk to Yoshio. I would have assumed that by tuning the ECU he would have adusted to the fuel map until he achieved the best A/F ratio for your set-up???

A little OT but...
I have been toying with the idea of doing ECU tuning (and cams), Did you notice an improvment after the tuning?

Cheers,
Chad
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Old 03-23-2003, 12:27 PM   #7
karl_hungus
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Default Re: ECU Tuned correctly?

Quote:
Originally posted by goobie


I have been toying with the idea of doing ECU tuning (and cams), Did you notice an improvment after the tuning?

There was definately a noticeable difference after getting tuned with the mods I have. Yoshio will ask you what you want out of your car and he will tune for that. So you could see very different results depending what you want. I went for an autocross setup that maximizes acceleration over top end and the car now has a very linear power delivery, it feels much more smooth and although I don't have numbers to back it up... I'm sure there is more power there.

I got tuned by Yoshio back in October and everything was fine up until recently so I'm sure that something has changed that is causing me too run so rich. It seems to have even gotten worse and my A/F gauge needle is pegged full rich on the highway. I'm definately going to have to do something so I guess I'll fork over the cash and pick up a front O2.
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Old 03-23-2003, 01:00 PM   #8
SubaruStu
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Default Re: ECU Tuned correctly?

Quote:
Originally posted by goobie


Well even though MY00+ RS's tend to run a little rich (Mine seems to as well) Your ECU has been tuned. Maybe you should talk to Yoshio. I would have assumed that by tuning the ECU he would have adusted to the fuel map until he achieved the best A/F ratio for your set-up???

A little OT but...
I have been toying with the idea of doing ECU tuning (and cams), Did you notice an improvment after the tuning?

Cheers,
Chad
Time for another test drive??

Stu
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Old 03-23-2003, 01:02 PM   #9
SubaruStu
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Default Re: Re: ECU Tuned correctly?

Quote:
Originally posted by karl_hungus


I got tuned by Yoshio back in October and everything was fine up until recently so I'm sure that something has changed that is causing me too run so rich. It seems to have even gotten worse and my A/F gauge needle is pegged full rich on the highway. I'm definately going to have to do something so I guess I'll fork over the cash and pick up a front O2.
Fortunately the front one is not the "expensive one", about $125
tax incl. from the dealer. The rear is $275

When mine went, it started to idle poorly, sucked gas and lots
of soot on the exhaust pipe, until it started to throw slow response
codes.

Stu.
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Old 03-23-2003, 11:11 PM   #10
goobie
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Quote:
Time for another test drive??
Haha! I was impressed with your car Stu... Is it still running nicely? What impressed me the most about your car was how smooth it delivered power across the entire power band. I would be interested in doing back to back g-tech runs with my car and then you do yours to see how they compare. Other than the cams and ECU tuning, we have a similar set-up... I would be interested to see the results. Doing anything next weekend?? J/K!
Question: Would there be any benefit to raise your rev-limit 500RPM or so with the addition of the cams? Has anyone done it?

Cheers,
Chad
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Old 03-24-2003, 09:51 AM   #11
SubaruStu
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Quote:
Originally posted by goobie

Haha! I was impressed with your car Stu... Is it still running nicely? What impressed me the most about your car was how smooth it delivered power across the entire power band. I would be interested in doing back to back g-tech runs with my car and then you do yours to see how they compare. Other than the cams and ECU tuning, we have a similar set-up... I would be interested to see the results. Doing anything next weekend?? J/K!
Question: Would there be any benefit to raise your rev-limit 500RPM or so with the addition of the cams? Has anyone done it?

Cheers,
Chad
You could definitely get a little more out of it by raising the redline,
even a little. The power does not fade at redline, so I am sure
it would keep pulling well past. I should have done it when I got
the ECU done. There is still more in there. Due to a cramped schedule,
I didn't get a chance to get Yoshio to do any more than the basic
tuning, which was based on 87 octane (which was in the tank at
the time). There is still room to go up to 89 or 90+ octane and raise
the redline another 500 or so. I may send it down for some tweaking
when the weather is a little better for working on the
car. I wish that I could bring myself to spend on a port and polish, and upgraded valvetrain. Sigh.

I should be able to make it to the April meet next week.

Stu
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Old 03-24-2003, 10:00 AM   #12
SubaruStu
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Oh yeah, the car s still running fine. It was a little more picky about
starting in the cold weather because of the cams, but it never
let me down. There was an issue with Misfire CELs when it went
from fast idle to normal. I believe that it was due to less than ideal
ignition (the cams are right near the edge and require a good clean
spark). That went away with a new battery. A good set of wires
would also help. The only thing to clean up is the Cat Inefficiency
CEL, if I ever get around to doing the electronic fix.

Cheers...Stu
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