What causes multiple cylinder injection shutdown in a BMW X5 stalling?
2 Answers
Generally, it's due to spark plug failure, which can be diagnosed using the swap method. Activation procedure for BMW injection system shutdown: Open the drain valve on the injector outlet pipe; slightly open the injector inlet valve to preheat the pipeline and injector; gradually open the steam valve while monitoring the pressure in the steam tank; open the condensate valve to allow slow entry into the steam tank for 5-10 minutes of vessel preheating while observing tank pressure, maintaining proper drain tank water level to ensure normal automatic drainage, then slowly merge the injector outlet's mixed steam into the deaerator heating steam line before gradually closing the drain. Spark plug replacement intervals: Platinum spark plugs should be replaced around 40,000 km; performance degradation manifests as cathode erosion causing ignition gap variation and stability reduction - regular replacement is recommended.
I've encountered the issue of multiple cylinder injection shutdowns on the BMW X5 several times. Common causes include ignition system failures, such as worn spark plugs or faulty ignition coils. Once a cylinder fails to ignite, the engine control unit automatically shuts down multiple injectors to prevent damage. Fuel system issues are also critical - injectors may be clogged with carbon deposits or have poor electrical connections, leading to fuel supply interruption. Voltage stability should also be checked, as problems with the alternator or battery can affect injector operation. Multiple cylinder shutdown indicates a serious problem, possibly an ECU module error. It's recommended to stop the vehicle immediately, check the fault codes, avoid DIY repairs, and seek professional auto repair services promptly to prevent engine damage.
