Engine misfire is the result of ignition system failure, and when multiple cylinders experience misfire simultaneously, it's referred to as multiple cylinder misfire. Several factors can cause multiple cylinder misfire:
1：Faulty Spark Plugs and Ignition Coils: Aging or damaged spark plugs or ignition coils can lead to poor ignition. If multiple cylinders are affected, it results in multiple cylinder misfire. Therefore, regular inspection and replacement of spark plugs and ignition coils are essential preventive measures against multiple cylinder misfire.
2：Fuel Supply Issues: A lean or rich fuel-air mixture supply can cause multiple cylinder misfire. Possible reasons include fuel pump failure, clogged injectors, low voltage, and lost injector data within the DME (Digital Motor Electronics) system.
3：Abnormal Cylinder Pressure: Cylinders require adequate pressure to operate correctly. If there are pressure issues in multiple cylinders (such as low pressure), it can lead to multiple cylinder misfire. Checking for cracked or scored cylinder walls can help determine if there's a problem in this area.
4：Cylinder Wire Faults: Cylinder wires connect the spark plugs and ignition coils, and if there are issues like open circuits, short circuits, or wire aging, it can cause multiple cylinders to misfire.
In summary, multiple cylinder misfire can result from various factors. Regular inspection and maintenance, along with timely troubleshooting and resolution of issues, can prevent and address multiple cylinder misfire, ensuring the engine operates smoothly.
