What is the appropriate RPM after starting a car?
2 Answers
Generally, the engine RPM can reach 1200-1500 during the starting moment. However, during a cold start, when the lubricating oil cannot reach the upper part of the engine, it is more appropriate to keep it within 2000 RPM to reduce wear. Below is some related information about car RPM: 1. Definition: Car RPM refers to the engine's rotational speed. The level of engine RPM relates to the number of work cycles per unit time or the effective power output of the engine, meaning the engine's effective power varies with different RPMs. Therefore, when specifying the engine's effective power, the corresponding RPM must also be indicated. 2. RPM measurement: Typically, a speed sensor is used, corresponding to the signal teeth on the flywheel, to measure the engine's RPM.
Having driven so many cars, the RPM after startup is indeed a common issue. During a cold start, it's completely normal for the RPM to be higher, usually around 1200 to 1500 RPM. Why? The engine is cold, so the ECU injects more fuel to increase the RPM, helping the catalytic converter and engine warm up quickly. After about half a minute to a minute, when the temperature gauge needle starts moving, the RPM gradually drops to 700 to 900 RPM, which is the most comfortable idle state. However, be cautious—if the RPM stays above 1000 RPM after the engine has warmed up for three to five minutes, or if the needle shakes like it's dancing, it might indicate a dirty throttle body or a faulty oxygen sensor, and you should get it checked immediately. Also, avoid stepping on the accelerator right after startup; letting the car idle for a moment is better for the engine.
