I have a 2001 530I, 120,000 miles. A couple of weeks ago the breather system froze up while it was about -25 degrees. Car thawed out and seemed to be fine. Several days later, it starts fine but about 1 minute into the warm up it starts running very rough. Took it to the shop and was told that the fuel injector o rings were bad and needed to be replaced. Today the shop calls and tells me that did not fix the problem and it now appears that all six of the injectors are leaking fuel during the warm up process. Keep in mind that after the car is warmed up it runs fine.
I am wondering what could have caused all six injectors to go bad at the same time. Is this a common problem or is this somewhat of a mystery. The shop is questioning why they would go bad all at the same time and wants to replace the fuel pump regulator too!
Any opinions or help would be appreciated.