2015 C400 Engine Issues
Thread Starter
Newbie
Joined: Nov 2012
Posts: 1
Likes: 0
From: Toronto
2012 ML350, 2015 C400
2015 C400 Engine Issues
Anyone have any issue with engine backfire on cold startup? C400 is 8 weeks old, and at 3 weeks started to backfire in the engine compartment, not the exhaust, approx 2-8 times, and idle's around 1,300rpm. Engine sounds a little rough when idling. The problem goes away after engine warms up - runs smoother then, and idle's around 700pm.
Junior Member
Joined: Oct 2013
Posts: 64
Likes: 1
From: Quebec
2015 C400
Anyone have any issue with engine backfire on cold startup? C400 is 8 weeks old, and at 3 weeks started to backfire in the engine compartment, not the exhaust, approx 2-8 times, and idle's around 1,300rpm. Engine sounds a little rough when idling. The problem goes away after engine warms up - runs smoother then, and idle's around 700pm.
MBWorld Fanatic!
Joined: Oct 2014
Posts: 4,524
Likes: 1,181
From: WI
17 E43; 21 GLS580
The engine can be less than smooth till the engine reaches 80C. Its completely normal. I dont warm up the engine, simply drive conservatively till it reaches normal operating temp. Never had any problems except the almost imperceptible lumpiness till warm.
