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Old 02-24-2008, 06:47 PM   #1
Scooby Specialist
Member#: 157532
Join Date: Aug 2007
Chapter/Region: MWSOC
Location: Iowa
2002 MY03 EJ207 E85
Dom 1.5XTR Twinscroll!

Default Wierd AFR Issues. Swinging almost a full point.

2002 WRX Sedan
modd'd stock injectors 808, 820, 820, 824
gp moto catless 3" TBE.
helix v3 up pipe
tial 38mm EWG
Lightweight flywheel
domtune boost control solenoid

I think thats everything...

Anyways about a month or so ago the hose blew off the passangers side of the intake manifold and i lost fuel pressure and was running lean for a day or so. Got it hooked back up on there and stuck a ziptie around it for good measure. Immediately I noticed I was running ~10:1 instead of my target 11.3:1 or so. sometimes even in the high 9s:1 ratio. pig rich basicly. I figured it was just because that line had been leaking the whole time, causing me to have poor fuel pressure, and we had just been tuning around it the whole time. Either that, or the TGVs were getting sucked closed at high rpms since my sensor was screwed up from the new turbo install. I took some logs for a few days, and then one day all of a sudden I was running right where I should be, right at 11.3:1. It's been doing this for a few weeks now.

I put in new plugs the other day, one step colder NGK Iridiums at the request of my tuner. Also fixed the TGV sensor that we screwed up on the turbo install.

did a compression test and the results were great. I can never remember which cylinder is which so I'll just use front and rear.

Drivers Front - 160
Drivers Rear - 155
Pass Front - 149
Pass Rear - 155
Drivers Front - 155

I still have the same AFR problems, although the car does feel much better with the new plugs. Here are the 2 most recent logs. The rich log was taken 2 days before the lean log. I haven't even opened the hood since then. I haven't touched anything on the car in between these 2 logs.

Here is a link to the romraider forums. I posted this up there because I couldnt get the logs to look readable on these forums. Also i posted my fuel map as well.


I realize there is a huge boost spike but I can't imagine that is causing this issue at all. That will be taken care of soon enough, We are just totally stumped on why the AFRs are going crazy like that. Any ideas would be greatly appreciated.
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