Derrick115

Has anyone experienced this problem? I have a 2016 E350 Sport (Flex Fuel) with 71K miles and on several occasions, while approaching the car after an hour or more of turning it off there's a small engine compartment explosion with smoke coming from underneath the hood (before I start the car). Recent repairs include replacement of ignition coils, replacement of intake manifold and gaskets, replacement of spark plugs, replacement of 1 fuel injector, oil separator, centrifuge cover, and camshaft. But no one seems to know the cause of this problem.

CaliBenzDriver

Real good maintenance items list. Consider a serpentine belt kit within 10kMi or replace old idler bearing directly above A/C compressor soon.

This sounds like it could be heat stress sounds while engine is cooling down.... the smoke may be release of coolant vapor.

Pls use your camera take picture of your concern ✌️

Jeedie

Sounds a lot like this issue recently posted:

https://mbworld.org/forums/e-class-w...-exploded.html

Derrick115

Hi, thanks for replying. A photo would only show smoke coming from underneath the engine, also the problem is random and seems only to occur after the proximity key gets in range of the vehicle when I'm walking toward it.

S. Madman

Sound like a fuel pump priming, if you are walking around the car with your keys W212 (and newer cars) like doing that. Most people don't like to wait to crank a car, so pump preps just in case. Could be a faulty one?