Sean

The point Andrew his making is that all versions of the DME ME9 on N42 / 46 engine have the ability to program a slight offset that can increase the base setting of the minimum valve lift limits from 0.3mm to 0.9mm.

Also the DME ME 9 will perform Minimum travel adaptation . Due to differing levels of internal friction from one engine to another, each individual engine has a slightly different air requirement at idling speed. Thus the valve travel of the variable valve gear at idling speed is dependent on the engine's internal frictional losses.

The minimum valve travel is limited to a specific practicable distance. This is necessary in order that manufacturing differences in components do not result in severely uneven distribution of intake air to the individual cylinders. If the amount of air required to maintain idling speed is less than that achievable with the minimum permissible valve travel, the throttle valve closes by an amount sufficient to reduce the idling speed to the required level.

If the DME then nevertheless detects uneven running at minimum valve travel, the minimum permissible valve travel is increased. When valve travel is greater, the differences between individual valves are proportionally lower.

Example: Minimum valve travel: 0.3mm, Difference in valve dimension: 0.03mm = 10%

Example: Minimum valve travel: 0.6mm, Difference in valve dimension: 0.03mm = 5%

There is also a maximum limit to adjustment of the minimum valve travel as above a certain valve opening, the desired consumption-reducing effects of the Valvetronic system are lost.

So are you saying the Function to alter the minimum valve lift was missing , Which I have to say its always been there when I have needed it when using Autologic. Or are you saying the Autologic team actually wrote a programme that altered the valvetroinc base setting so it is greater than the BMW original programming limits, i.e greater that lets say 0.9mm.

The picture shows wear on the eccentric cam /intermediate levers . Also sticking valves can cause the problems.