Hondata

I am currently tuning my D15b7 on s300 version 1.4.8.0. Did all my tuning in open loop, got everything pretty dialed in at about 14.7 AFR. I am using a PLX wideband, to D10, with R136 and R138 removed. Wideband and S300 are identical. I am using my wideband signal for my closed loot, with target at 2.34V.

When I switch to closed loop, everything seems to work fine. But it seems though if I decel for more than a few seconds, it seems to switch back to open loop, or just run rich?? When I data log it, it shows the AFR's going lean during decel like it should. When I get back on the throttle, the short term graph shows 0% as if it were in open loop again. Nothing else on the data log shows any difference?

I forgot to save the data log, i will go out again shortly and redue it and post it. Thanks in advance for any help.

I have also had this problem. At times my short term and long term fuel trims will freeze and my afr will start changing from what it was as if I were in open loop. I was coming down the interstate and it was keeping things pretty well at 14.7 when it froze it when lean around 15.8. I have to kill the ignition and restart the car and the datalogging to get it to work. Any input on this would be helpfull.

Can anybody give some input on this....

Calibration? Datalog? Error codes? Overrun is when the ECU tests the o2 sensor so this information would help.

I will try to figure out how to load the datalog when it happens again. No error codes. When going back and watching datalog the fuel trims just flatten out making a straight line were they stopped. If ignition is cut off and engine restarted all is ok until it happens again. I have tried waiting to see if it picks back up, but never does until I reset everything.