Rough idle when warm - CLS55

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Merc55k

Member
Joined
Nov 8, 2016
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50
Car
Cls55
Looking for some thoughts on a slightly odd issue thats recently developed.
My car runs fine when it’s cold, but when it’s warm it turns really rough, to the point it feels like it might cut out. Past experience was always been the opposite... any ideas? Tried googling and also searched the forum, but can’t find anything on it.

Thanks
Neil
 
Try the following if no codes present

Plugs, Leads, Coils, + Fuel pumps and filter
 
yep mine is slightly uneven when cold but settles after a decent blat up to 4k revs (when warm of course) Have not had it the other way round. Coil packs (only needs one to affect the idle noticeably) probably the most likely suspect If my 996 is anything to go be.
 

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