What Causes the Speedometer Needle to Swing Back and Forth?
1 Answers
When starting the vehicle, erratic jumping of the dashboard needles may be due to poor contact in the control wiring of the dashboard or a malfunction in the circuit board controlling the dashboard. If the idle speed is unstable and the dashboard needles jump erratically when the engine is running, and the throttle response is sluggish when pressing the accelerator, it indicates that the throttle body and intake passages are dirty. 1. Possible causes: If power-consuming devices such as lights or the radio were left on when the vehicle was last turned off, causing a power drain, this can also lead to erratic jumping of the dashboard needles. In this case, jump-starting the vehicle will allow the battery to recharge once the engine is running. Another possibility is a faulty battery, which needs to be replaced promptly. 2. Precautions: Upon starting, the speedometer and tachometer needles will rotate from 0 to full scale and then return to their positions. The fuel gauge and water temperature needles will rotate from one side to the other and then return, which is the dashboard performing a self-check—no need to worry. If the needles continue to swing back and forth after the self-check is completed, it indicates an electrical fault. It is advisable to promptly visit a 4S shop or repair facility for inspection and repair to avoid potential driving hazards.
