M102 high idle when warm

S2ksimon

Hello,

I have run out of ideas tracking down this high idle - I have reverted to the stock ECU to control the idle, and while this gives a better outcome when cold and when in gear - the idle is too high when in park.

I have connected a smoke machine to check for vacuum leaks.

log-jetronic-v412-20250301-105257.csv

86kB

This is a M102 in a w460. Log attached shows a warmed up engine moving from park to drive.

Any ideas?

JHM

Drive selector has a switch, that is engaged, when selector is moved out of P or N. Check if the switch is working