2004 EP3
K24a swap
Injen CAI
DC 2.2 Cams
Supertech Springs/Retainers
3" Exhaust
50 degree VTC pinned at 35 degrees
DW 265c Fuel Pump
91 pump gas
Having an issue with my EP3 running lean(19:1-20:1). Had the car tuned with some new DC2.2 cams and took it to a track day, the first couple sessions it did fine, last session it started running lean, all RPMs. I thought it might be the fuel pump and just threw a new one in to see. Still had the same issue.
It's been sitting in my storage unit and I just went to take a look at it and saw the following, with logs attached, I have both the oem PRB o2 sensor along with an AEM wideband, both read similar values:
- Car would start, idle and run a normal AFR up until it warmed up to about 150 degrees
- Once it warmed up to 150 degrees I would see a lean condition, I didn't try to drive it like this so the log is just at idle
- We had it set to open loop last time we tuned it with the new DC 2.2s, so I updated to closed loop using the oem wideband, uploaded the tune and the issue went away, took the car for a drive and it was running great, around 13:1 at WOT, also logged after the issue cleaned up
- I also noticed in the Misc settings that the Speed Sensor was set to always show a speed, I switched that back to read from the stock speed sensor
I attached 3 logs:
Log 1: ep3 warm up (no issue) was taken when I first started the car, AFRs looked fine
Log 2: ep3 warm up (issue) was taken after I turned the car off turned it back on and the lean condition started after ECT's hit 150
Log 3: ep3 warm up(no issue after moving to closed loop) was after I turned the car off, uploaded the same tune with closed loop enabled and the lean condition went away, although short term trims looked high at first, took for a WOT run
Tune Kal: This was your tune I downloaded after you tuned the car, didn't change anything in any tables, just the parameters I mentioned(Speed Sensor in Misc Settings and Closed Loop Operation using the PRB o2 Sensor) above when I reuploaded the tune and the issue went away.