What is the reason for a car having power and fuel but unable to start with no sound?
2 Answers
The reason a car has power and fuel but cannot start with no sound is severe wear of the starter carbon brushes, malfunction of the starter control mechanism, or damage to the starter clutch. The specific reasons are as follows: Severe wear of the starter carbon brushes: This manifests as weak starting, where the crankshaft turns very slowly, visibly through the belt and pulley. When the wear is extremely severe, the starter cannot rotate the crankshaft at all, producing only an electric current sound. Malfunction of the starter control mechanism: In addition to the starter motor, the starter assembly includes an electromagnetic control mechanism. When the control mechanism fails, the small pinion gear cannot engage with the large flywheel gear, preventing the engine from starting. The symptom is turning the key to start, hearing only the high-speed rotation sound of the starter without the sound of the engine crankshaft flywheel operating. Damage to the starter clutch: Generally, the starter operates at a speed of 120r/min, while the engine idles at around 900r/min after starting. The clutch's role is to prevent the engine from driving the starter in reverse after startup, which could happen if the driver fails to release the key promptly, keeping the small pinion gear engaged with the large flywheel gear, potentially burning out the starter.
Oh, I've encountered situations where the car has power and fuel but makes no sound at all when trying to start it many times. The most common issues are problems with the starter motor or solenoid switch—the motor might be stuck or the relay could be faulty, preventing it from turning. The inspection steps are simple: first, ensure the battery terminals aren't loose (some people think having power means everything's fine, but poor contact can also cause it to fail); then check the fuse box, locate the fuse for the starting circuit, and replace it if it's blown. If all these are okay, it might be the anti-theft system locking up—try unlocking with the key a few times. When repairing cars, I've found these faults are often caused by moisture or aging, so don't force ignition; it's safer to have it fixed at a shop. Remember, regular maintenance of the electrical system can save a lot of hassle.
