04 Z4 SMG - Starting issues....

My second question of the day.

I have an '04 Z4 SMG that I purchased used about two years ago. Just coming up on 50,000 km now.

I use the car exclusively for weekends which means the car sits doing nothing for a week or two at most.

I find that if I don't start hte car for about two weeks it has a bit of trouble starting. Here's what happens.

- I start the car.
- The revs go up when the engine starts as per usual.
- Then the revs almost completely die...but then goes back to purring at the engine idle rpm's.

After I use the car once I don't have any more issues. It just does this if I don't use the car for about 1.5 weeks.

Any ideas on what might be happening?

Sounds like it's beign starved of fuel, like the line back to the tank is draining during the 1.5 weeks.

There is enough fuel in the fuel rail to start the car but before the fuel pump brings the system up to pressure, the car stumbles.

I think on the Z4's if you switch the ignition on (but dont start), the fuel pump runs to pressurize the system, after a couple of seconds then go ahead and start the car.

thanks for the help! I'll be sure to give that a try.