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Mini Cooper R R56 won’t start but crank.

Hello all,

I am
Happy to make my first post here I hope anyone can help me.

I have r56 Cooper S won’t start but crank without problème I can feel and see the engine hesitate (firring) I can see the gauge level up and engine want to start but no real and concret start.
We connected ista D and no fault code..
only few battery management and tension too low but it’s not this my problème.

UPDATE
Today I take compression in all cylinder !! Result :
Cyl.1 - 85 PSI
Cyl.2 - 85 PSI
Cyl.3 - 67 PSI
Cyl.4 - 85 PSI

I lost compression in all cylinder..
regards.