Viano Over Revving when cold

M80

Senior Member
Joined
Jan 21, 2006
Messages
5,930
Reaction score
2,733
Location
Derbyshire
Your Mercedes
2014 639 Viano- 651, 5sp Auto. 2009 S211- 646, 5sp Auto.
I'm interested in opinions on this.

When I start from cold and drive even with very little throttle the engine will rev, up to 3k.
In Buxton it's not possible to leave the town without going up hill, and more often my 1st mile or so is up a steep hill.

I try to keep it gentle as in the 30 I'll be doing 20, then a little later in the 40 I'll be doing 32, accelerating slower than a push bike the revs are high. If some one comes up behind I can't keep them down to my restricted speed so up with the revs to get more speed, still slow though.

I hate the idea of the engine revving so high on a cold engine even if it does have full synth oil.
I know there is supposed to be a faster warm up due to cats and DPF but flippin' 'eck.
Yesterday at coolant temp 35 C it started to behave by running at lower revs, today it was at 32 C.

On Torque there are no fault codes.

Do others experience the same or should I be looking for a fault?
 

LostKiwi

Senior Member
Joined
Aug 25, 2006
Messages
31,324
Reaction score
21,574
Location
Midlands / Charente-Maritime
Your Mercedes
'93 500SL-32, '01 W210 Estate E240 (RIP), 02 R230 SL500, 04 Smart Roadster Coupe, 11 R350CDi
3000rpm does sound excessive. I would expect 1200-1500 perhaps but not 3000rpm.
 
Top Bottom