Late Gear Shift Up, Gear Change up at high Revs - Intermittent fault - S212 E350 Estate 2011

[Seftonbarn]

Bit of a strange one this that has been going on for several months. It has been plugged in and there are no relevant fault codes. Occasionally, when starting the engine it kinda struggles to start and coughs a little before firing up. When the car starts like this, when I drive off it doesn't change up gear until it reaches about 2500-3000 revs. So when I am driving around town at 20-30mph it is sitting at about 2500 revs in, I guess, 2nd or 3rd gear. It won't change up until closer to 3000revs. On another day, when I start the car and it starts normally with no hesitation, when I drive off the gear change up is smooth and normal. In both cases the engines itself sounds and feels as if it is performing normally. Any ideas from you clever people would be very much appreciated.

 

[markjay]

Has it been plugged to MB STAR? Or to a generic OBDII scanner?

 

[Seftonbarn]

Has it been plugged to MB STAR? Or to a generic OBDII scanner?

It was plugged in to a newly purchased Snap On device from my local garage.