What are the reasons for a car motor not starting?

[Ricardo]

There are several reasons why a car motor may not start: insufficient battery power or dirty starter terminals causing poor contact, leading to the starter not turning; a broken electromagnetic switch coil in the car starter; issues with internal components of the starter; or a fault in the anti-theft system. 1. Car Motor: The electronic starter is what people commonly refer to as the motor, also known as the starter. 2. Notes: When the starter carbon brushes are severely worn, the symptom during startup is weak starting, and the crankshaft can be seen turning very slowly through the belt and pulley. If the wear is extremely severe, the starter may not be able to turn the crankshaft at all, only producing a buzzing sound of current.

[JoelDella]

I've encountered the issue of the engine not starting several times. With the old Santana, the most common causes were a dead battery or poor contact. When the negative terminal of the battery was loose, turning the key would result in no response except for a clicking sound, while a completely drained battery would just black out the dashboard. Another issue could be a faulty starter relay, where a burnt coil fails to conduct electricity—turning the key would light up the dashboard but the car wouldn't start. Additionally, worn ignition keys or interference from the anti-theft chip can cause signal errors, making the car fail to recognize the key, as if the wrong key was inserted. In winter, low temperatures reduce battery performance, making it more prone to failure. It's best to regularly check the battery fluid level and keep the terminals clean, forming a habit to avoid being caught off guard when urgently needing the car. Experienced drivers often keep a set of jumper cables handy for emergencies.

[Hector]

Having seen numerous cases of motors failing to start during car repairs, they generally fall into several categories: starter motor body failures such as seized gears or worn carbon brushes, preventing the engine from turning over; or insufficient fuel pump pressure leading to fuel delivery issues, especially noticeable during cold starts with a weak humming sound; then there's the ignition system where spark plugs fail to spark or ignition coils are damaged, preventing fuel ignition. Sometimes, sensors like the crankshaft position sensor lose signals, misleading the computer to lock out the start, requiring checks for corroded or short-circuited wiring. Modified cars are more prone to issues, such as high-power headlight replacements potentially interfering with the circuit. It's advisable to focus on inspecting the starter and fuel filter during annual maintenance, rather than scrambling when a breakdown occurs.

[BarrettAnn]

It's really annoying when the motor won't start. Once when I was going to work, it just wouldn't budge. After checking, I found that the battery terminals were corroded and loose. After cleaning them, it started successfully. Battery aging is the most common issue, and if the key fob's battery is dead, the signal won't transmit, causing the same problem. Sometimes the anti-theft system might malfunction and block the start, but a simple reset will fix it. Usually, don't pile up clutter near the engine compartment, and regularly clean off dust to prevent the wiring from getting damp. These life tips will help you handle it easily without rushing to call a tow truck.