Why does the tachometer not move when stepping on the accelerator?
2 Answers
The reasons why the tachometer does not move when stepping on the accelerator include a broken tachometer or foreign objects stuck inside preventing movement. Below is expanded information on the functions of the tachometer: 1. Observing whether the car is started: When the car is not running, it will be in an idle state. At this time, the tachometer needle does not point at 0, but at a position above 700 RPM. Therefore, at any time, if you are unsure whether the vehicle has started, you only need to check the tachometer. 2. Determining the shift timing: Generally, gear shifting is based on the engine sound, but with the increasing sound insulation of vehicles, the engine sound is almost inaudible. The most accurate method to determine is based on the engine RPM.
Last time my friend's car had the same issue, the tachometer wouldn't budge when pressing the accelerator. I told him to first check if the clutch pedal was stuck. For automatic transmission cars, you need to verify whether the brake override system was accidentally triggered. Another common culprit is the throttle position sensor - this component is particularly prone to acting up. Once it fails, the ECU won't receive throttle signals. If the electronic accelerator pedal sensor has poor contact, it can cause similar symptoms - inspect the connector for water damage or corrosion. For older vehicles, pay special attention to fuel line blockages; if the fuel injectors aren't working, the engine naturally won't respond. This problem shouldn't be ignored - last week a car with this issue almost caused an accident on the highway. The safest approach is to immediately call a tow truck to take it to a repair shop for diagnostic trouble code reading. Attempting DIY fixes could easily lead to more serious problems.
