M275 Idle misfire (or return to idle misfire)

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pillow

Active Member
Joined
Feb 19, 2019
Messages
274
Location
Hampshire
Car
C216 CL600
Hi all,

Does anyone know what can cause a misfire during idle only, or that can be provoked by poking the throttle pedal and letting the car roll back to idle (it then stumbles a bit when it hits idle rpm).

Codes aren't being set but they can be felt, and are detected by the fault counter. One cylinder (nr. 5) is notably worse than other but it occurs across about 9-10 cylinders. Cylinder 5 has read up to 5 faults on the counter before it resets.

When being driven under any conditions there is nothing registered on the fault counter under any driving style. This only happens at idle.

Any ideas?
 

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