BMW 745Li cranks but won't start despite new battery and rebuilt alternator on BMW 745Li

Some BMW 745Li owners report experiencing issues where the vehicle cranks but won't start, even after installing a new battery and a rebuilt alternator. These problems may stem from improper or insecure battery connections, which can hinder the starting process. Additionally, some owners find that the alternator may not be charging the battery correctly, leading to further starting difficulties. Faulty spark plugs or ignition coils are also common culprits, potentially causing power failures and poor fuel economy. Moreover, issues with the immobilizer system can prevent the car from starting, necessitating a check for malfunctions. Lastly, problems within the fuel system, such as a malfunctioning fuel pump, can contribute to these starting issues. It is recommended that owners systematically diagnose these components or consult a professional mechanic for a thorough inspection if the problem persists.