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Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 21982
Experience:  BEng hons Mech engineering, in auto industry 22 years
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A class diesel recent sudden noise with small amount of smoke

Resolved Question:

A class diesel recent sudden noise with small amount of smoke in engine compartment near front and left side of engine, sounds like a machine gun and increses with accelleration
Submitted: 1 year ago.
Category: Mercedes
Expert:  Matt replied 1 year ago.
Hello I'd say whats most likely is you have an blown injector seal so the combustion gas is blowing past the injector, either that or a cracked exhaust manifold I'd suggest having a feel around the engine with bare hands to feel for gas blowing past your fingertips - do this from cold and you'll have 20 seconds or so before it all gets too hot
Customer: replied 1 year ago.
Took off mainfold no gasses from injectors.Sounds like exhaust but cant see where or feel escape of gas.This my daughters car and I have also questioned her about miss fueling which may have happened and my limited experience with a Peugeot diesel similar problems, smoke and noise like a machine gun until repaired.Will see if I can get it on a ramp to check exhaust leakage and follow through from there.
Expert:  Matt replied 1 year ago.
hello the other possibility is a hole or crack in the inlet manifold? as its only plastic so check along its seams for leaks
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