Hi,everyone
I recently drove my 2011 Mini r56 s from LA to Toronto, and everything were fine along the way. But after one night stay in Detroit, when i start the car in the morning, the engine rev very unstable (acting sort like the fuel pump failed).
and this rattle gose away after 1 mins orso, and the check engine light gose off as well, and dose not happen again when engine is warm. And today i just found out that this cold start problem can be stopped by double cliking the sport button!!!??? really really weird. i hope its not electrical system failure. Before i left LA, the car had done a comprehensive Service and check.
Plz help, thanks

 

Btw, the car feels normal when i driving it.