M272 C350 idle speed question
Thread Starter
Junior Member
Joined: May 2015
Posts: 23
Likes: 1
From: Vancouver B.C
2012 C350 coupe
M272 C350 idle speed question
I'm wondering what your guys idle speed in drive are? I picked my car up from the dealership today for having the air oil separator replaced and halfway home at a red light I realized that my car was idling poorly, I can feel vibration in the brake pedal, in my seat and by putting my hand on the passenger seat, as soon as you accelerate it goes away and back to running smooth. It's idling at 525rpm right now and I swear it never idled that low although I can't remember and I know it idled perfectly before I took it in.
Thread Starter
Junior Member
Joined: May 2015
Posts: 23
Likes: 1
From: Vancouver B.C
2012 C350 coupe
They also washed the car after I requested them not too and swirled the **** out of it which I'm not impressed about.
Junior Member
Joined: Feb 2016
Posts: 58
Likes: 9
From: Canada
'06 E55 / '10 GLK 350
OP, are your RPMs stable? My car idles at 500-600 RPM too, so that's fine. To me it sounds like engine mounts since you're only complaining about vibrations at idle. Do you feel more vibrations in Drive/Reverse or when you turn the steering wheel ( while at idle speed, not moving )? Do they fade away when you go over 1000-1200 RPM ?
