Have a 2011 MCS with the later N18 engine, however it has started to develop a few issues in the last few days.
Firstly I get a rattle from the engine between 2500 - 3000 rpm particularly when cold but then disappears when the car is warmed up. Noise only occurs when the car is driven and not when you rev it when stationary.
Second problem that has now occurred is the erractic idle which happens both when the car is stationary and under load. Strange when driving as it is as if the accelerator has a mind of its own. I have taken a video of the car when stationary and the engine warmed up after a 25mim drive;
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