My 95 bmw has trouble starting sometimes lately

Sounds like worn trans clutches

try to get a fuel pressure test or get it put on the machine to see if the
crank sensor or cam sensor is going bad.

for bmw 1999 323i

the next day my car dont starts
battery alternator starter was checked

Check the wiring connector on the coil. It may be loose. This really does sound like an issue in the ignition electricals similar to an issue I had with my 95 S-10. The coil itself had loosened as well as he wiring to it.

Check the fan activate sensor/switch seems to be not functioning well its allowing the fan to operate late.

There is an over pressure protection switch that could be at cause and there is an under pressure protection switch that might be at cause and there is also the on/off pressure switch located on the dryer canister that actually controls the temperature of your evaporator that might be just plain wore out. Last I remember NAPA wouldn't even stock these as they wear out within a month of use and just quit like your situation. My solution to that is to hot wire them on with a section of bare copper wire within the plug assembly - cu'mon GM you have to do better than that to stay slovent. Opps, too late.

So, what pressure(s) are you running and/or can you trace down the lack of electricty to your compressor's clutch? You've just started to trouble shoot this problem.

I had this problem in my shop and its been a Crank sensor and on one occasion it was a fuel pump relay that was bad. Most like its a the cranks sensor that's bad NOT the fuel pump relay but check both. To check see what missing when vehicle doesn't start or shuts off . If there is NO gas its the relay. If there is NO spark its the cranks sensor. Good Luck and contact if you need more help. Thanks for using FIX YA

This may be the fuel pump failing, if it is it will strand you some time in the next few months.