What are the possible reasons for difficult or failed engine starting?
2 Answers
There may be several reasons for difficult or failed engine starting: 1. Starting system failure prevents the engine from turning or turning too slowly, resulting in the engine failing to start: (1) Insufficient battery charge. (2) Ignition switch failure. (3) Starter motor failure. 2. Ignition system failure causing the engine to fail to start: (1) Poor performance of the ignition coil. (2) Ignition module failure. (3) Incorrect ignition timing. 3. Fuel injection system failure leading to engine starting failure: (1) No fuel in the tank. (2) Fuel pump not working or fuel pressure too low. (3) Fuel pipe leakage or deformation. (4) Overly dirty fuel filter. 4. Intake system issues: (1) Idle control valve or its control circuit failure. (2) Air flow meter failure. (3) Throttle valve failure.
I often see that when the engine has difficulty starting, a dead battery is the number one culprit. Corroded or aged electrodes causing the voltage to drop below 12 volts can prevent the starter from turning. Carbon buildup on spark plugs is another common issue, and a failing ignition coil can cause the engine to misfire. If the fuel pump is weak or the filter is clogged, the fuel supply is cut off, starving the engine. A stuck starter or a faulty relay can also prevent the engine from turning, especially in sub-zero temperatures. Sensor failures, such as a faulty crankshaft position sensor, can confuse the ECU, leading to incorrect ignition. Simple tools like a multimeter can quickly check battery voltage. Regular maintenance and inspection of these points can save a lot of trouble. Warming up the car or preheating it before starting in winter is more effective.
