How to Quickly Resolve Multi-Cylinder Misfire?

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Solutions for multi-cylinder misfire are as follows: 1. Fault Diagnosis: First, identify which cylinder(s) is experiencing misfire. Connect a fault diagnostic tool while the engine is running to check for misfire trouble codes in specific cylinders. Combine this with the diagnostic tool's live data stream function to monitor detailed misfire conditions. If basic valid information cannot be obtained through the diagnostic tool, the "cylinder cut-off method" can be used. This involves manually deactivating a cylinder during engine operation (e.g., temporarily stopping fuel injection or ignition to that cylinder). If engine RPM drops significantly or vibration worsens after deactivation, the cylinder is functioning properly. If RPM drop or vibration change is minimal, the cylinder is malfunctioning or inactive. 2. Component Replacement: Check the spark plugs of misfiring cylinders for proper condition (correct gap, carbon buildup, or insulation breakdown). Replace faulty spark plugs if found. If spark plugs are normal, perform a high-voltage spark test on the misfiring cylinder. Weak or absent sparks indicate issues with the ignition system's power supply, high-tension wires, or ignition coils. Replace faulty components based on inspection results. 3. False Alarm Monitoring: Sometimes misfire faults are falsely reported due to monitoring system errors, triggering the check engine light. For engines using crankshaft speed fluctuation monitoring systems, utilize the diagnostic tool's "tooth signal learning" function to recalibrate and eliminate false alarms.