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Hard start, stalling..
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Tmun1 is Offline
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Default Hard start, stalling.. - 29th January 2018, 07:00 AM

Hey guys. Having a bit of a problem with my 09 Mini Cooper S R57.

It started with a very sudden idle misfire. Or what I think is a misfire.. the whole car shakes on idle, rhythmic pumping sound from he exhaust and RPM needle goes up and down itself.

Now I’m having trouble starting and it keeps stalling at traffic lights.
My mechanic serviced the car and now he thinks the only issue left is the oxygen sensor (bank 1 sensor 1) which is he fitting soon.

It’s still misfiring on idle, the whole car shakes and has lost a lot of power. Runs surprisingly ok-ish around 20-30mph but it definitely stutters a lot.

Could it really be just the sensor or is there something more sinister going on?

Any help at all would be appreciated!
  
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