W169 (A150) engine revs 'bouncing / pulsing'

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tuscan440

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

I can't use the forum search function on my phone for some reason as it keeps disappearing so I'm not sure if this has been answered before.

Basically our A150 seems to pulse or bounce at any of the rev ranges. It happens every couple of seconds and is most noticeable when maintaining a rev range and when at idle. I connected up my ODBII reader and looked at the live data and the only thing that struck me as being a bit suspect was the O2S 11 (oxygen sensor) reading jumped between 0.1-0.8v no matter what the revs were. Is this to be expected? If not then any ideas what it could be and/or what i should be looking for on my ODBII reader?
 
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