Mercedes ML350 M276 engine tune cautions and noise diagnostics.

My experiences in diagnosing an engine starting, running rough, and noise issue.

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[JettaRedIII]

The M276.8XX turbo motors do use a 6-point plug, whereas the M276.9XX NA motors use that strange 12-point 14mm plug. The turbo motors use NGK plugs and mine indexed nicely within +/- 45° if the injector.

[pyatt]

Spark plug Shims are used to index plugs. Changing Shims will alter the fully seated rotation angle of the electrode.

[pyatt]

Full Synthetic oil is critical on these motors and maximum of 5, 000 mile intervals if you don't want problems. Every PM the injectors need cleaner concentrate ran through them to stay clean.

[lilchu]

I have a SLK 350 with a small rattling noise when starting. Lasts about 2-4 seconds. I changed the Timing tensioners and Check valves behind the tensioners. When I was going to remove the check valves the vehicle didn’t have any??? I installed new check valves and it still rattles after sitting for a long time. I’ve read about that the Engine belt tensioner can make rattling noises too

[Leo]

So what your Mercedes dealer did was give inaccurate information typical, that's why it's best to use an independent Mercedes mechanic in my opinion .

[AD-ctmx]

Use Mann filter with liqui moly 5 w 40. And add liqui moly jectron in gas tank. It’s injectors.

[besikchitidze]

GREAT VIDEO!!!
Hi, I have a 2012 ml350.. actually, my wife does...))) The engine has a rattling noise at startup and goes away after a few minutes of idling. After engine restarting it runs normal but if I restart after a few hours it comes back((( my guess is it's got to be those engine oil flow control valves ( there are 4 of them) people say it may be chain tensioners or cam udjasters. What's the best way to identify the problem? Was told there is TSB because of that problem. Should the Benz dealer take care of it?
thanks

[TripleB]

Still sounds rattled..check the Crankshaft position sensor and replace it ..and possibly the camshaft position sensors and camshaft magnetic adjusters ..very easy to do ..plus the oil should be changed a lot sooner than specified..oil burn does happen if left to normal change periods ..these M276 motors are touchy with oil and the sensors

[MultiKevinhill]

I think you should still replace the gaskets

[Efficient]

How did you get off the middle cowl piece? It is attached to the same bracket the wiper assembly is mounted to

[joelcrow]

Is the sound we hear in this video the problem or after it’s been fixed?

[s.b.]

Could the timing chain cause the cam shaft adjuster to fail in the ML350

[henryforo]

Man zip it for a sec let us hear the engine