What Causes a Weak Sound When Starting the Car?
2 Answers
Car starting sound feeling weak may be due to the following reasons: 1. Battery charge: Nowadays, most cars use maintenance-free batteries, but it's still necessary to regularly check the charge indicator: ① Green indicates normal charge ② White indicates the need for charging and maintenance ③ Red indicates the battery is dead (some may display: green for good, black for low charge, white for battery damage requiring replacement). The lifespan of a battery is generally around two years. If the battery charge is found to be low, it should be replaced promptly. 2. Throttle valve body and idle valve: Carbon buildup in the throttle valve body and idle valve can cause starting difficulties. For vehicles with an idle valve, lightly pressing the accelerator while starting can help the engine fire, but releasing the pedal may cause immediate stalling. It's best to have these components cleaned and inspected at a repair shop promptly. Additionally, during maintenance, it's essential to change the air filter frequently. In northern areas with more dust, the air filter should be replaced every 10,000 kilometers, and even more frequently if driving on sandy or dusty roads. 3. Fuel pressure: To ensure normal engine starting, the residual fuel pressure in the fuel system after the engine is turned off should not be below 2.5～3.5 kg/cm². Otherwise, insufficient pressure will prevent the fuel injectors from spraying enough fuel to guarantee startup. Repeatedly turning the ignition switch can restore the fuel pressure to normal, making starting easier. However, it's best to have a professional mechanic inspect the fuel system to identify and fix any issues. 4. Lubricant quality: As winter approaches, it's important to replace all types of lubricants, including engine oil, transmission fluid, and power steering fluid. Regular lubricants become more viscous in winter, reducing fluidity and increasing friction resistance during component movement, which makes cold starts difficult. Choosing slightly less viscous oil can reduce mechanical wear and protect the engine.
I used to experience weak ignition when driving my old car, mainly due to a failing battery. If the battery is aged or chronically undercharged, it can't support the starter motor's power demand, resulting in a sluggish cranking sound. Problems with the starter itself, such as worn internal brushes or coil failures, can also cause the engine to turn over slowly. Additionally, loose or corroded battery terminal connections can lead to intermittent current flow. In summer heat, batteries are prone to electrolyte evaporation, while in freezing winter temperatures, their discharge capacity plummets. I always listen to the cranking sound when starting the car - if abnormal, I immediately check the voltage with a multimeter. If it's below 12V, the battery needs replacement. Regular maintenance includes testing battery life; typically, replacement is needed every 3-4 years to avoid the frustration of roadside breakdowns. Always remember to turn off lights and electronics to prevent excessive power drain.
