Each time I start the car, it will not make 1st to 2nd shift, until the engine reaches approximately 3000 rpm, regardless of engine load. If I turn the S-E-M switch to the "M" position, the transmission immediately makes the upshift. After a couple of minutes of driving, everything is OK! I have changed the engine (because of very high oil consumption) and transmission, aswell as the Motronic and transmission control unit. The new (used) transmission acts exactly like the old one. Any ideas?