Four mechanics can't find problem
 

My 2001 X5 3.0 will start when it wants.Sometimes it starts right a way for a week and sometimes for an hour.The car cranks and sounds like it's going to start,but it does't,you keep trying for 15 min. to 30min. then it starts like nothing happended.Then it will work perfect for 3 days or a week maybe more,then samething happens again and it can do it everytime you try to start it,the car has gone thrue 4 mechanics wich I believe they are trial&error mechs.They have change fuel pump,computers and everything they ca think of.I'm starting to believe it could be injectors or electrical,because once it starts it runs great.I would like to get some feed back before I keep spending more money.Thanks to anyone that can help me out,RAFAEL.

Sell it on the days it working great.

crankshaft sensor?

Throttle Valve??

I been thinking the samething,but I would really would like to keep it as second car and keep the M5 in the garage more time

Thanks I will check it out

Have you taken it to the local BMW dealer? They should have the proper diagnostic tools. Hopefully you're not gonna say you already took it there.

Yes I taken it to the dealer,they gone thrue all the diag.test,maybe I should sell it before I grab a hammer.

Oh man, thats not good. Well, hopefully someone will have an idea. Sorry can't help more. :(

can a bad key cause starting issues? (referring to the programming) try the valet key or the spare.