Hello All,
My DD (TI log)started to run super rich with black smoke out the pipe. Started a few days ago running rich but getting worse. Now looks like old school diesel!

Vacuum at -15" idle approx 900rpm.

1)Checked AIS appears to work. Yes the old style is a PITA.
2)leakdown on fuel rail is great... lots of pressure after the car sit for an hour.
3)FPR slight smell of fuel when vacuum nipple open but no liquid. the other vacuum lines slight fuel smell as well.
4)swapped MAP and doubled checked that baro solenoid was in correct position and not leaking with the car off (solenoid also off). car ran the same.

No codes shown

My thought is extra fuel is getting into the engine by a leak or the ECU is adding extra fuel due to a sensor issue

my action plan for lunchtime
1)ordered a new FPR just in case but a good idea to have a spare anyway.
2)check FPR with vacuum pump
3)check 02 sensor readback
4)check TPS
5)check VSS
6)check coolant sensor

other thought are welcome.