e46 318 auto cold start problem

[aidenwildey]

hi i have a 318 auto basicly when i go to it in the morning it struggles to start it takes up to 6 or 7 attempts to get it going i have checked the fuel pressure the vanos the valvetronic the air flow meter the trottle body had it on the diagnostics no obvious fault codes i have a feeling it is the crank shaft sensor if anybody can tell me if what it could be it would greatly appreciated thanks aiden