Fluctuating Idle Issue - S54 swap

[DesertBMW]

These are the last codes:

P1122
P1222
P0506
P0030
P0050
P0036
P0223
P0122
P0056

Do you have PAsoft 1.4? You should be able to dump software from DME, then send it to me, I will see if there is something wrong with the tune.

[E30Strube]

As a follow up to this, I seem to have solved the idle issue (P1122, P1222, P0122, P0223, P0506) by replacing the TPS and adjusting the TBs. The car still goes into "safe" mode (won't go past 4000rpm). After connecting the car to a BMW scanner, the O2 sensors are not active. To the ECU, they are basically not there. I'm not sure why they wouldn't be reading.

[nando]

Do you have PAsoft 1.4? You should be able to dump software from DME, then send it to me, I will see if there is something wrong with the tune.

PAsoft can't do anything with MSS54 other than read/reset codes.

[E30Strube]

As a follow up to this...I figured out the problem. I spliced in a new connector for my O2 sensors and soldered the connections. Apparently that was the issue with the car going into limp mode. I cut out the soldered joints and used BMW butt connectors with heat shrink insulators. After changing them out, the O2 sensors activated and the car went into closed loop like it should. For the idle issue, I changed the TPS and adjusted the TBs. Once that was done, no more codes and the car runs like a champ.

I'm still amazed that a few simple solder connections could cause these issues.

[328ijunkie]

^Notice the factory doesnt use solder anywhere

they crimp everything.