Closed loop stops working after decel?

[GregBB1]

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.

[dmunseyautotech]

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.

[dmunseyautotech]

Can anybody give some input on this....

[Hondata]

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

[dmunseyautotech]

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.