[Aundrew]

Starting a few days ago, my car is having trouble starting from a cold start. Once it does start, it drives normally until a certain point. Then a chirping sound comes from my car while driving. The car idles very roughly where it shakes my car. This is a 2008 328i. Just had oil and brake fluid changed last week.

[dylim]

Eccentric shaft sensor and/or gasket leaking oil (valve cover, oil filter housing). If you have lots of sludge in your engine, the sensor gets clogged, and results in rough idling and difficult to start. For the chirping noise, put the car on lift and take a look at the brake cables, including the brake pad wear sensor cables, maybe it's loose and rubbing? Also check the master cylinder to make sure the level is good.

[dylim]

chirp could be due to the serpentine belt. http://www.e90post.com/forums/showthread.php?t=945070

[Aundrew]

Thanks dylim. I'll check them out asap