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Thanks bud, to cut a long story short it looks like the coils are okay, it does however smell quite strongly of petrol fumes which may suggest over fueling. My attention has turned to the variable intake which has a vac operated switch to one side - mine has a split boot but also noting...

Plugs arrived early, popped those in (real job getting caps off) no change - taped cylinder 4 plug to engine and started, plenty of spark so looks like coil pack okay. The catalytic convertor is starting to whiff, possibly due to unburnt fuel making its way back ?

Hello folks, similar problem to OP but probably not the same furry issue or least hope not :) This is w245 B1700 petrol 2005/6 with no history, basic runaround. Cylinder four has a miss determined by pulling HT, removed plug - gap looks huge at 1.1mm although OEM plugs are set to 0,9m which I...