Glyn Morgan
The ECU is seeing a misfire on cylinder #4, it then turns the injector off to protect the catalyst.
You are seeing the effect rather than the cause of the misfire.
Regards Glyn
Message Thread 
Mini Cooper 1.6 2002 - Misfire on #4 injector, code P0304 - Fixed # - Kev Shackleton July 10, 2013, 5:17 pm
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on July 10, 2013, 6:15 pm, in reply to "