Small misfire when warm W169 A150

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tuscan440

New Member
Joined
Feb 27, 2016
Messages
6
Car
Mercedes A150
Hi

My wife's A150 has a very small misfire, or more like an intermittent judder (very small) when the engine is warmed up. You can only really feel it when sat in traffic or when cruising at a constant speed. The rev counter doesn't even dip when it occurs but it is just noticeable. We still have warranty on the car for the rest of the month but they will charge for diagnostics and any work that isn't covered in the warranty. Can i expect this to be something in the ignition system slowly on its way out? Motorway mpg is still around 36mpg and there is no noticeable loss of power.

I can borrow a obdII reader to view the live data but I'm not sure if i will see anything so let me know if you think it would help.

Any ideas?
 

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