What Causes a Volkswagen Car to Fail to Start with Abnormal Noises?

[McIsaac]

Insufficient battery power, starter motor failure, fuel supply system malfunction, and ignition system failure can all cause a Volkswagen car to fail to start and produce abnormal noises. Battery failure or excessive discharge leads to insufficient power, which is inadequate to drive the starter motor. Normally, the starting voltage of the battery should not be lower than 11.45V. If it falls below this voltage, the car will not start properly. You can use a multimeter to check the voltage between the battery terminals and replace the battery if necessary, or use jumper cables to start the car. Starter motor failure prevents it from driving the flywheel to rotate, making it impossible for the engine to start. It is necessary to check whether the starter motor's wiring is properly connected. If there is an internal fault, the starter motor needs to be replaced. Blockages in the low-pressure fuel line, loose or leaking fuel pipes, air in the high-pressure fuel line, clogged fuel injectors, or incorrect fuel injection timing can all cause fuel supply system failure. In such cases, there will be insufficient combustible gas in the cylinders, preventing the engine from starting. It is necessary to visit a repair facility to systematically check whether all components of the fuel supply system are functioning properly. In the ignition system, both the ignition coil and spark plugs are wear-prone parts and typically need to be replaced every 50,000 to 80,000 kilometers. If they have not been replaced for a long time, the insufficient ignition energy will fail to fully ignite the combustible gas mixture in the cylinders, causing the engine to fail to start. It is necessary to check whether the components of the ignition system are functioning properly and replace them if needed.