Cold Start Problem
I looked a bit, and found similar issues but none that seemed to actually match what I am experiencing. I am going to try to be as specific as possible.
Car model: 2008 325i Coupe
My car has recently been having problems during ignition. It started happening right after I almost ran out of gas. I had stopped somewhere after the car already read ----km remaining, but the gas station was real close so once I started the car I only had to drive like 300m to the gas station. The car got there fine and the fuel pump read 16.2 gallons dispatched after refueling.
After that, anytime the cas has not been driven for 12+ hours it will not start on its own. Pressing the ignition button will cause the engine to start, then it will rev to 1000rpm, falter, and shut down. I've only ever done this more than once a couple of times. Usually I press the gas pedal like I describe next on the second attempt.
Only way to get it to start is to press the gas pedal. I only have to press it briefly to rev beyond 1000 to like 2k or so. After that the car returns to 1000, falters a bit, but regains compusure and returns to 1000.
The car is a little jumpy for a couple of 100 meters of driving, but once it warms up it drives fine for the rest of the day. Even after 8 hours of none use it is fine the same day.
The threshold seems to be around 12-15 hours, any rest that long or longer results in the problem described above.
I took it to the dealership and they could not find a problem with it. Said it was fine after a week, but I have the car again and the problem persists. One of the supervisors at the garage said that I should try running the car at heigh revs to try and clear the fuel intake and other systems in the car.
What do you all think? Any ideas what the problem might be?