[dk944s2]

Hey Maciek, my 1989 944S2 has the same cold-start problem, though it runs flawlessly otherwise. Been reading up on Bosch Motronic engine-management, and one thing it says to look at is the engine temp sensor. If it's faulty, maybe mixture is not rich enough on cold-start. My source (Charles Probst's Bosch Fuel Injection and Engine Management) says to also check the thermo-time switch, the fuel-pressure reading and for smooth operation of the flap in the airflow sensor.
I'm a novice at this stuff. Does anyone know if a bad oxygen sensor(s) could cause a very difficult cold start? Thanks for any insight!