Mercedes 7G Gearbox- hard downshifts cold

[LittleEnus]

2007 W221 and when cold coming to a stop it really jerks down (from 2nd to 1st). Its fine when warm and throughout the rev ranges.

Any experience or advice?

Many thanks

[Speed_Demon]

Transmission fluid?

[buggalugs]

Transmission service (oil & filter)

There's a re-adaption procedure you can do if above doesn't work, can't remember the details but google will.

[Claudia Skies]

Probably a software issue, so I suggest starting with proper diagnostics - probably by your friendly local dealer (or expert independent IF he has all the right equipment)

[LittleEnus]

Thanks all. Is Mercworld in Nuneaton recommended?

[kuro]

Sounds like a sticking valve body. I had a saab93 that developed various problems with the autobox including harsh shifting, although mine was like that even when warm. Yours doesnt sound as bad. A fluid change is your first port of call as new fluid may free up the problem. Its not a guaranteed fix though.

[TheAllSeeingPie]

Sounds like a oil and filter change at least, maybe even two of them with about 200 miles done between them.

[Welshbeef]

Surely its only in sport mode it enters 1st gear to pull away and to ease to a stop.

[PositronicRay]

LittleEnus said:

Thanks all. Is Mercworld in Nuneaton recommended?

I've not used them but they do have a good reputation.
PM me and I have the details of a mobile guy (ex MB maindealer tech) which I've used.

[surveyor]

PositronicRay said:

LittleEnus said:

Thanks all. Is Mercworld in Nuneaton recommended?

I've not used them but they do have a good reputation.
PM me and I have the details of a mobile guy (ex MB maindealer tech) which I've used.

Yes - The owner is on the mbclub forum and knows his onions.

[LittleEnus]

surveyor said:

Yes - The owner is on the mbclub forum and knows his onions.

Thanks guys- I've PM'd you Ray.

[LittleEnus]

Hi chaps and chapesses. Ray never replied so wondered if anyone knew this ex-Mercedes engineer that is mobile around Warwickshire?

[LittleEnus]

Bueller... Bueller.... anyone?