Stuck in Open Loop?
 

Noticed something strange this weekend. I'm running OFT+OFH with the OTS Stage 2 UEL map. On the highway, cruising ~70mph, I glanced at my torque app and noticed meaured AFR's in the low 12's, rock steady LTFT, STFT of 0.0, and a commanded AFR of 14.7. This remained for quite a while, I changed loads and throttle and rpm (even brought the car to a stop and idled the engine), and still saw that it was stuck in Open Loop (STFT of 0.0 and AFR give it away). I could tell that data wasn't hung up (MAF, AFR, other monitors were updating).

Once I restarted the car it was back in closed loop when it was supposed to be. Anyone else seen this happen? Any ideas if there's some condition out there that would trigger constant open loop?

Full mod list - OFH, OFT, catted front pipe, stock OP, stock catback, stock intake, stock filter.

I honestly don't know all that much about tuning but could it be a few of the prongs weren't fully connected into OBD port? did you mess with the connection when you restarted car? otherwise, I have no clue...:iono:

Have you upgraded your OFT lately with the newest template from the Openflash website?

I did try to unplug and plug back in the OBD adapter and reconnect Torque while cruising in open loop (before I restarted the car), and it still showed the car was in open loop.

No, I haven't upgraded the OFT template in a while. Was there an update to the tune at all?

there was an update but I don't think that would cause the problem you are having. if it was a one time thing, i'd probably chalk it up to just that. if it happens again or frequently, i'm sure shiv or someone would be happy to help.

When you log with the OFT, does it show the same thing?

Looking at trims doesn't prove anything, it's an indication only. You need to log fuel sys status to see OL/CL.

Okay, so this is definitely happening. What I see, and this happens during highway cruise, is AFR begins dropping. When I look at targeted AFR, it usually starts around 14.2ish. Over the course of an hour or so at 70-75mph cruise, the targeted (and measured) AFR works it's way down to mid 13's. Once it hits a certain point, the car goes open loop, short term trims go to zero, targeted AFR just defaults to a straight 14.7 and measured AFR is around the high 12's.

Any ideas what could possibly causing targeted AFR to drop through cruise and eventually force everything to open loop? Are there any knock parameters or temperature feedbacks that could be driving this?

Tried setting A/F #3 corrections to 0? I assume IAM is 1? I can't understand why the target AFR would drop.

Don't use torque ffs, if you have an oft there's no reason for you to ever plug in a shitty bluetooth dongle.

I was using OFT.

Here's just a snapshot of a log I took while this was happening... I didn't get a log when it hit low 13's/high 12's and went to open loop, but when this trip started AFR and targeted AFR were in the mid 14's. In the log it is now at around 13.7, this was about 1.5 hours into highway cruise.

http://www.datazap.me/u/wepeel/cruise?log=0&data=1

I know this is reviving an old thread but mine does the same. OFT+OFH

If you want to eliminate the tune then get a stock rom and use romraider to set the P0420 cel code (cat efficiency) to disabled.


then run the modded stock tune and see if you get same problem.