Recently had engine mounts replaced under warranty on my 2015 S model.

Sitting at idle in park, my idle RPM is at 500. As soon as I switch into S+ I notice my RPM goes up to around 850-900 and stays there. This definitely did not happen before the mounts were replaced and I’m wondering if it has anything to do with the mounts.
my SA is out on vacation right now so I can’t contact him to ask if there was a trans software update performed on the vehicle or not.

Is this normal? Anyone else’s vehicle do this? I am 100% sure this did not happen before the mounts were replaced.

tia

 

This is normal. Well discussed before.
Most likely you never paid attention to this prior to the mounts

https://mbworld.org/forums/w212-amg/...servation.html

your 100% isn't so close to 100%

 

I tried searching and couldn’t come up with anything.
So weird how I never noticed it before. Do you know if it was part of a update on ECU/TCU or was it always there?

 

My cars doesn't do squat. No change in RPM or sound between C, S, S+ or M.
I even went so far as to update my stock TCU flash from factory thinking that was the culprit.
I have friend with a 2014 E63S that does in in S+, and another with a 2015 that does it in S and S+.

Drives me nuts not knowing why stuff does what it does.
We all have EC tunes by the way, just different versions.

 

Mine has always had a noticeable change between C, S, S+ I love it. S+ is like an exited puppy just squirming with excitement waiting to be let go, compared to C lazy sleepy dog.