1. Circuit breakers often see oxidation and erosion of faulty contacts. When the capacitor fails or is not selected, the circuit breaker contacts will be oxidized and ablated. When the capacitor is not in good condition, it will cause a weak overall high-voltage fire. If the contact gap is too large, the engine will misfire at high speeds; If the contact gap is too small, ignition will be delayed. If the spring force of the contact arm is insufficient, the engine will stall at high speed. If the cam wear is uneven or the transmission shaft is loose, the ignition time of each cylinder will be inaccurate, and even the contacts cannot be disconnected, and the ignition cannot jump.
     2. The distributor often sees that the fault Distributor cover or distributor head is cracked, damaged, damped, and contaminated, which leads to leakage, causing engine misfire.
     3. The ignition advance mechanism often sees faults. If the spring of the center block loses elasticity, the engine often experiences excessive ignition advance angle when running at medium and low speeds. If the dial pin is excessively worn, it will cause inaccurate ignition advance angle. If the diaphragm of the vacuum regulator ruptures, it will prevent the engine from increasing the ignition advance angle at low loads. If the spring tension of the vacuum regulator is insufficient, it will cause the ignition advance angle of the engine to be too large.