What is the situation with BMW multi-cylinder misfire?

2 Answers
SanChase
07/29/25 11:08pm
BMW multi-cylinder misfire may be caused by spark plugs losing ignition capability, throttle malfunction, or engine carbon buildup issues. Carbon deposits can lead to multi-cylinder misfire: causing engine vibration problems. Engine carbon deposits have significant impacts on vehicles, primarily by reducing engine power - resulting in uneven power output and gradual attenuation, making the engine increasingly powerless. It also increases fuel consumption, adding to economic burdens. Spark plugs losing ignition capability causing multi-cylinder misfire: manifests as cold start difficulties, meaning hard ignition and difficulty starting the vehicle. Severe cases of combustion chamber carbon buildup may even cause cylinder knock, producing noises during low-speed acceleration, damaging pistons and crankshafts, leading to engine overheating which severely compromises vehicle safety. Furthermore, it causes excessive emissions, not only failing annual inspections but also directly worsening environmental pollution hazards.
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OMax
08/16/25 1:16am
I've noticed that the issue of multiple cylinder misfires in BMWs is often caused by aging or faulty mechanical components. Take my own experience for example, the ignition system in the engine is most prone to problems. If the spark plugs are worn out or have too much carbon buildup, the ignition energy becomes insufficient, leading to single-cylinder misfires that accumulate and eventually cause multiple cylinders to stop working. There's also the issue with the fuel pump—when the fuel pressure is too low, the fuel supply is interrupted, causing the engine to stall. During inspection, first check the condition of the spark plugs and try replacing them with new ones. Then measure the fuel pressure; the normal range is between 4 to 5 bar—if it's lower, the pump is likely faulty. Additionally, a clogged air filter can reduce air intake, affecting the combustion of the air-fuel mixture. Regular maintenance is crucial. It's recommended to replace the spark plugs and air filter every 30,000 kilometers, which can reduce the probability of such failures by 80%. While driving, pay attention to the engine sound—abnormal vibrations are a warning sign. Stop and inspect immediately to avoid damaging the internal components of the engine.
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