What's the reason for the engine not starting and the needle shaking?
2 Answers
The reasons for the engine not starting and the needle shaking: instrument panel damage, dead battery. Here are the specific reasons: Instrument panel damage: If the idle speed is unstable and the needle jumps around when starting the car, and the throttle response is sluggish when stepping on the accelerator, then it is due to dirty throttle and intake tract; some car models have a self-check function, and the instrument lights will rotate for a self-check. Sensor/speedometer line damage or circuit failure. Dead battery: One situation is that there were power-consuming items left on when the car was last turned off, such as lights or the radio, resulting in a dead battery. In this case, you can ask someone to give you a jump start, and the car will recharge the battery after starting.
I've driven quite a few older cars and encountered issues with the engine not starting and the dashboard needles shaking, which are usually caused by a weak battery. When starting, the engine draws too much power, causing unstable voltage that makes the instrument panel needles go haywire. This is particularly common in winter or with cars that haven't been driven for a long time, as the battery's internal resistance increases with age, making this problem more likely to occur. Additionally, worn spark plugs or faulty ignition coils can also lead to difficult starts accompanied by abnormal needle behavior. During routine maintenance, it's important to regularly check the battery voltage and terminals to avoid problems when you need the car the most. In severe cases, it might even blow a fuse or damage the starter motor. I've learned to first try jump-starting the car, and if that doesn't work, take it to a professional shop to inspect the electrical system and ignition system. Safety first—don't repeatedly force-start the engine.
