Hi all hope somebody can throw some light on this, from start off the gearbox seems to go through all gears very quickly, when you go to kick down it wont drop back any gears , then on other occasions everything is fine and full power through all gears and kick down is working, somebody says air mass meter? somebody says vacum , somebody says transmission, first 2 i dont know but its a sealed transmission unit which is filled from factory but can it be checked , hope this makes sense as it is killing me
thanks
paul

 

Year, model?

 

Hi Year is 2001 and model is ML 270 CDI , Automatic