What is the problem with the car not starting? The car can't start and there is a sound of gear grinding. What should I do?

To start a car, you first need to step on the accelerator to give it fuel, and then the spark plug will ignite it. Generally, it will start immediately. If it doesn't start for a long time, you have to consider whether there is a problem. So what should you do if the car can't start and there is a sound of gears?

What is the problem when the car won't start?

If the starter motor speed is slow when starting the engine and the instrument light is obviously dimmed when starting, it is mostly caused by insufficient battery power. If the battery power is sufficient and the starter motor speed is normal, there are many reasons why the car cannot start, the most common ones are spark plugs, ignition coils or air flow meters and gasoline pumps working poorly.

If the battery is fully charged, first turn the ignition switch to the ON position, let the fuel pump work for three seconds before starting, and step on the accelerator appropriately during the starting process, which is conducive to starting the engine. If the engine still cannot start after turning on the ignition switch and waiting for a few seconds, connect the oil pressure gauge to check whether the fuel pressure is abnormal. If the fuel pump is abnormal, replace it in time.

Secondly, malfunctioning spark plugs and ignition coils or engine control wiring harnesses bitten by rats may cause the car to not start. In addition to routine inspections, it is best to use the diagnostic computer to check for fault codes, and observe the water temperature when the engine starts, and whether there are any abnormalities in related signals such as the crankshaft and camshaft position sensors. This will help to better analyze the cause of the fault.

The car won't start and there is a gear rattling sound. What should I do?

When the vehicle starts the engine, it cannot start after turning on the key, and a gear-grinding sound can be heard. We cannot confuse the rattling sound of the battery being low on power with the sharp sound.

When the battery is low on power, the starter will only make a rattling sound, and will never make a sharp gear clicking sound. If there is a sharp gear clicking sound, there may be a problem with the motor gear or flywheel ring gear.

This means there are faults in the following aspects.

①, the outer edge of the flywheel gear ring is fuzzy, the motor gear cannot mesh with the gear normally, and there is a sound of friction between the motor gear and the gear ring.

② Similarly, the edge of the motor gear swells and there is a sound of friction with the gear ring.

③. The one-way device inside the motor gear is broken and cannot mesh with the ring gear normally.

The appearance of this sound indicates that the car should be an old car. It will not happen with a new car. You can only dismantle and check the ring gear and motor gear. Of course, after some motors are replaced, this phenomenon may also occur if the gear and ring gear do not match.

Why does the car make a clicking noise when it starts?

The first is the common battery drain, such as when the car has not been started for a long time, causing the battery to discharge itself. This situation is especially prone to occur in the winter when the temperature is low in the north. You can find a battery and use wires to correctly connect the positive and negative poles to the car battery.

The second situation is that the starter motor belt is too loose or the pulley is worn. Emergency start for manual transmission cars. Find a safe downhill slope, shift to third gear and use the car speed to drive the engine, then start the engine. There is a high chance that it will start, but after starting it, you need to go to the nearest repair shop for repair.

The third situation is engine failure, which can only be repaired by a maintenance technician.