E36 S54 swap coding

[et89]

I have an S54 swapped E36. Swapped it last year.
Stock S54, MSS54HP, K&N intake, ZF gearbox etc.
Software version 2001-JD34

I am no stranger to mapping/coding cars, as i had a M52 turbo car before that i tuned using Romraider on MS41.3.

for the swap I used the info from the MSS54 wiki page and the how to video's from R3Z3N on youtube.
all was fine, at least I thought.

Yesterday I had my anual "smog", and the car passed. but what I noticed was that my AFR's where off. today i logged with BMWlogger.
I noticed that my O2's are extremely negative (pulling a lot of fuel) during idle. about 25%. During normal operation they seem to be ok... not perfect but ok.
overall they are pulling fuel. I decided to check my tune. I 0'ed out the "SAP engine to coolant temp factor" hoping that might solve the rich Idle.

I started over with the all original Bin, followed R3Z3N's how to again (patch SAP/Cat heating etc.)
I 0'ed out the "SAP engine to coolant temp factor" hoping that might solve the rich Idle.
I set the RPM limiter to 8100 in dyno mode en set both master and slave to 02 (Role).

Welp, no change in the rich Idle.
And RPM limit was still at 6300.

Did a readback, and my changes did stick to the ECU.

I'm lost. Can someone point me in the right direction?
Am i missing something?

[Bry5on]

Are you using a wideband O2 to measure in this case? The car should be seeking stoich based on O2 sensor readings as it operates in closed loop at idle.

[et89]

Are you using a wideband O2 to measure in this case? The car should be seeking stoich based on O2 sensor readings as it operates in closed loop at idle.

I have no Wideband installed at the moment.

I also tried to block the EGT Sensor DCT; but the sensor DTC is still showing.
So that might not stop the EGT monitoring.

Maybe there is something in the ECU that makes the cat protection run non stop at idle when the EGT DTC is on.
I know this makes the car run rich so the Cat's will be cooled. Hence the rich conditions for the O2's

My next step is to do the same things I did myself with tunerpro; but using Marty's tool. See what that does.
if that doesn't work I'll code cat protection out of the ecu 100% and see what that does.

Stock EU cats though, so I would like to keep some protection for the Cats. things ain't cheap.

this still won't make me understand why some changes (Like the rev limiter/Dyno mode) don't work though.
My tune says that I did all the things correctly, but my car doesn't behave like it.