What to Do When a Car Won't Start?

[EllianaRose]

Jump-starting: Bring two vehicles close together, connect the positive and negative terminals of their batteries, turn off all auxiliary electrical equipment in the vehicles, and start the vehicle with the dead battery. After starting, lightly press the accelerator pedal, turn off the ignition switches of both vehicles, and carefully remove the cables. Push-starting: Utilize a downhill slope, turn on the ignition switch before pushing the vehicle. Once the desired speed is reached, shift the transmission into second gear, quickly release the clutch pedal, and apply throttle. Analysis of Fault Symptoms: If a whirring sound is heard when the starter drive gear engages with the engine flywheel ring gear during startup, there are two possible causes: First, the engagement surface of the flywheel ring gear may be deformed. Second, the gap between the starter drive gear and the flywheel ring gear may be too large. If they cannot mesh properly, the engine will not start. When the main power switch is turned on, the starter drive gear engages with the flywheel ring gear and rotates together. This issue can arise due to two reasons: First, the holding coil of the starter solenoid may be incorrectly connected to the power terminal. Second, the three wires on the ignition switch may be misconnected. The diagnostic method is as follows: When the key is in the "0" position, the starter drive gear does not rotate; when in the "2" position, the starter motor drive gear engages with the flywheel ring gear and rotates together. If the engine does not start when the ignition switch is turned to the start position and no other symptoms appear, the possible causes are: First, the key or switch may be worn out and fails to complete the starter circuit. Second, the starter relay may not be connecting the starter solenoid circuit. Third, the power switch may not be completing the main circuit. Using a screwdriver to bridge the terminals at the rear of the starter can complete the starter circuit, allowing the engine to start. Testing the Starting System: The starting system's circuit generally includes the following basic components: the battery, the starter motor, and the cables connecting these parts. Additionally, the ignition switch, starter relay, solenoid coil, and the vehicle's anti-theft system are also critical components of the starting system. Malfunctions in any of these parts can lead to difficulty starting the engine or complete failure to start.