What are the reasons why the car always has no power and cannot start?

[StJames]

The reasons why the car always has no power and cannot start may include abnormal gear position, carbon buildup in the throttle, insufficient engine oil, etc. Below is a detailed introduction about the car throttle: Overview: The throttle is a controllable valve that regulates the air entering the engine. After the air enters the intake pipe, it mixes with gasoline to form a combustible mixture, which then burns to generate power. It connects the air filter at the top and the engine block at the bottom, and is referred to as the throat of the car engine. Classification: Throttles are divided into two types: traditional cable-operated and electronic throttle. In traditional engines, the throttle control mechanism works through a cable (soft steel wire) or linkage rod, with one end connected to the accelerator pedal and the other to the throttle linkage plate. The electronic throttle primarily uses a throttle position sensor to control the throttle opening angle based on the engine's required energy, thereby adjusting the amount of air intake.

[StPaige]

As a seasoned driver with nearly a decade of experience, I've encountered this situation multiple times where the car won't start due to a dead battery. Common causes include battery aging—these typically last only three to five years, as internal resistance increases over time, reducing charge retention. High summer temperatures accelerate electrolyte evaporation, making failure more likely. Alternator issues are another culprit; after driving, the battery should recharge, but a loose belt or faulty voltage regulator can prevent proper charging, leaving you stranded at the next startup. Parasitic drain is a sneaky problem—think trunk lights left ajar or aftermarket audio systems quietly draining power. Once, my oversight drained the battery overnight. Starter motor internal shorts can also sap power. Environmental factors like winter cold halve battery capacity and double starting difficulty. My advice: regularly test battery voltage with a multimeter—replace if below 12V, ensure all lights are off before parking, avoid insufficient charging from short trips, and use a maintainer to prolong lifespan.

[SanJayce]

I used to be an enthusiast for long-distance road trips and have experienced the embarrassment of a car that wouldn't start in remote areas. The reasons for a dead battery are often related to usage habits. Batteries reaching their lifespan is common, especially when I parked at airports or scenic spots for weeks without moving, leading to automatic power depletion. Generator issues, such as burned-out diodes or rotor failures, can prevent the battery from fully charging while driving. I always check the belt tension before trips to prevent this. Hidden power drains, like a stuck door light or a cigarette lighter overloaded with devices, continue to consume power after parking, increasing starting difficulties. In cold weather, the battery's chemical reactions slow down, making starting harder. I recommend keeping a portable jump starter handy and checking if a blown fuse has broken the circuit. Corroded wires or loose connections increase resistance, draining power faster. For prevention, develop the habit of turning off high-current devices when the engine is off and test the battery's health before trips to avoid risks.

[LaTanner]

I often encountered this issue shortly after driving, turns out it was a faulty battery - likely aged or with internal short circuits unable to hold charge. Replacing it solved the problem. Sometimes leaving the reading light on overnight drains it completely, so develop a habit of checking when locking the car. Generator issues could also be the culprit if it's not fully charging after driving. Cold weather makes batteries underperform, causing hard starts. Recommend asking a mechanic friend to test voltage and replace the battery.

[ElizaRose]

I'm concerned about vehicle maintenance. Most cases of a car not starting are due to a dead battery or issues with the charging system. Regularly measuring voltage can prevent this; the normal value is 12.6 volts, and action is needed if it drops below 11.8. A faulty generator regulator can prevent the battery from charging fully, and the dashboard lights may flicker as a warning while driving. To check for leakage, close the car doors and wait a while before measuring the current—if it exceeds 0.05 amps, there's a problem. In cold seasons, battery capacity decreases, making starting difficult, so it's important to clean the battery terminals promptly to prevent oxidation. Avoid frequent short trips that don't allow the battery to charge sufficiently, and test its health every six months.

[VonIvan]

I believe this issue is caused by multiple factors. The primary reason is an old or internally damaged battery that reduces its capacity, compounded by alternator malfunctions such as pulley wear preventing effective charging. Post-parking power drains like dashboard lights remaining on secretly consuming electricity, or starter problems such as a faulty solenoid switch drawing power without engaging are also common occurrences. Extreme cold or heat accelerates battery degradation. Checking fuses or loose wiring can provide emergency solutions like jump-starting, while long-term solutions involve replacing damaged components and regular maintenance to prolong usage.