It is due to poor contact at the battery terminals. The battery has positive and negative terminals, each connected with wires. The connection points are prone to oxidation, leading to poor contact. The solution is quite simple: pour boiling water over both terminals. While using sandpaper to polish them is the standard method, it's time-consuming and labor-intensive. This primitive method is simple and effective. Then, tighten the screws at the connection points with a screwdriver, and it's best to apply some grease to prevent future oxidation. Ignition system faults can be categorized into two types based on their location in the system: (1) Common faults in the low-voltage circuit: Insufficient battery charge; Poor or incorrect wiring connections; Poor battery grounding; Damaged distributor or Hall sensor; Faulty ignition switch or poor wiring; Damaged transistor ignition control unit or poor wiring. Most low-voltage circuit faults are diagnosed using an ammeter or voltmeter to check each wire and eliminate the fault point. (2) Common faults in the high-voltage circuit: Disconnected or leaking high-voltage wires; Cracked or punctured distributor cap; Burnt or punctured distributor rotor; Spark plug electrode gap too large or too small; Excessive carbon buildup on spark plugs; Damaged spark plug insulator; Damaged ignition coil or disconnected wiring. Most high-voltage circuit faults are diagnosed using the high-voltage spark test method. This involves removing the center high-voltage wire from the distributor or a cylinder's high-voltage wire, placing the wire end 3-6mm away from the engine block, and starting the engine to test for sparks, as shown in Figure 2. A strong spark indicates that the ignition system is functioning normally.
