Abnormal engine operation is usually caused by many reasons. In order to accurately diagnose the fault location, it is necessary to carefully analyze the cause of the fault and find out the fault location by scientific methods. The following are common troubleshooting methods for abnormal engine operation: 1. [Engine ignition time is too late] The engine is not easy to start, and the speed cannot be increased when accelerating. Sometimes the exhaust pipe "explodes" and the carburetor backfires. The reason may be that the gap between the power-off contacts of the distributor is too small, the fixing screw of the distributor shell is loose, and the ignition advance device fails. It is suggested to check whether the distributor shell is loose and whether the ignition time is adjusted too late, and adjust it according to the specifications. 2. 【 Engine ignition time is too early 】 When the engine starts, it will reverse, and when the throttle opening is increased, there will be a metal knocking sound, and the engine temperature will rise. The reason may be that the gap between the power-off contacts of the distributor is too large, the fixing screw of the distributor shell is loose, and the ignition device fails in advance. It is suggested to check whether the contact gap is too large and the ignition time is too early, and make adjustments according to the specifications. 3. 【 Engine ignition timing disorder 】 The engine fails to start or the carburetor backfires, and the exhaust pipe "catches fire", and the engine vibrates after starting. The reason may be that the high-voltage line is inserted incorrectly, and the electrical appliances and distributors are damaged or out of order. It is suggested to check whether the position of high-voltage branch pipe is correct, whether the socket of distributor cover leaks electricity and whether the distributor head is damaged. 4. 【 Engine circuit breaker contacts are easy to be ablated 】 The engine is not easy to start, and the electrical contacts are ablated. The reason may be that the contact gap is too small or the contact surface is too small, the capacitor is faulty and the regulator is not operated properly. It is suggested to check whether the contact gap is too small, whether the contact surface is skewed or offset, and whether the capacitor is invalid. 5. 【 One or more cylinders of the engine do not work 】 When one cylinder of the engine does not work, there will be a "chug chug" sound, and the engine will not run smoothly. It is suggested to cut off the fire source one by one, check whether the cylinder branch pipe position is correct one by one, and check the high-voltage line, spark plug and distributor cover to determine the fault position. 6. [Engine can't work] Engine powerlessness is characterized by poor acceleration, high water temperature, "beating" and tempering during acceleration. The reason may be that the low-voltage circuit is faulty. Check whether the contacts are in good contact and the capacitors are in good condition. If the contact gap is too large, the spring force is too weak, and the spark plug gap is too large, it is recommended to restore the technical state and adjust the gap as needed. 7. 【 Poor engine operation at high speed 】 The engine is unstable at high speed, which may be caused by excessive contact gap, weak contact spring elasticity, excessive spark plug gap, etc. It is suggested to check whether the contact gap is too large, whether the contact spring can contact normally and whether the spark plug gap is too large.