How to Solve the Problem of 4000 RPM at 120 km/h?
2 Answers
Generally speaking, exceeding 3500 RPM indicates insufficient vehicle power or excessive wind resistance, which can be resolved by reducing the speed. Different vehicle models may vary. For manual transmission vehicles, it is necessary to check if the clutch is slipping, while for automatic transmission vehicles, the transmission issues should be inspected.
I found that when the speed reaches 120 kilometers per hour, the engine speed reaching 4000 RPM is indeed abnormal, which may indicate a problem with the transmission or improper settings. If the car is an automatic, check if it's in sport mode or if the manual mode is stuck in a low gear, and try shifting to a different gear. A fault in the electronic control unit could also prevent upshifting. I recommend first connecting a diagnostic tool to read the error codes—sometimes it's just a loose or dirty sensor that needs cleaning. Older cars are prone to this issue due to thick or stagnant transmission fluid, and timely replacement with fresh fluid often improves the situation. Low engine efficiency may also consume more power, so check if the spark plugs and air filter are clean. A systematic inspection from simple to complex troubleshooting is necessary to avoid wasting money on unnecessary part replacements. Paying attention to the transmission system during maintenance is key to prevention. Don’t overlook this during high-speed driving, as it can burn out the engine or cause accidents. It’s best to have a professional shop thoroughly test the drive shaft and gears.
