What is the appropriate RPM for a car when it is first started?
3 Answers
When a car is first started, an RPM of around 1000 per minute is appropriate. RPM refers to the number of revolutions per minute of the engine crankshaft. The level of engine RPM is related to the number of work cycles per unit time or the effective power output of the engine. Precautions for starting a car include: 1. Shift to neutral and avoid pressing the accelerator when starting; 2. Turn the key to the 'on' position and wait for the vehicle's self-check before starting the engine; 3. Avoid cranking the starter for more than 30 seconds; 4. If the engine fails to start after three attempts, check the electronic control and fuel systems; 5. Avoid keeping the starter engaged after the engine is running.
Hey, I noticed that the tachometer shoots up pretty high right after starting the engine, usually around 1200 to 1500 RPM. Especially on cold mornings when the temperature is low, the needle jumps up immediately. I asked a technician friend at the 4S店 and learned that the engine needs higher RPM to warm up quickly when it's cold. The engine oil is as thick as honey, and the high RPM helps circulate the oil faster. However, after about 30 seconds, the needle drops on its own. Once it stabilizes around 800 RPM and the temperature gauge starts to move, that's when you can shift into gear and start driving. In winter, you might need to wait a bit longer than in summer. Remember not to rush and step on the gas pedal too hard—being gentle is better for the engine. If the RPM stays high for three to five minutes after starting, there might be an issue with the idle control valve or a sensor.
I've been driving my new car for almost half a year, and I've developed a habit of watching the tachometer every time I start it. For the first few dozen seconds, it usually fluctuates around 1400 rpm before gradually dropping and stabilizing at 750 rpm. Once during a maintenance check, I specifically asked about this, and the technician explained that this design is quite intelligent—the computer automatically controls the engine's 'warm-up,' and the high-temperature exhaust helps the catalytic converter reach optimal conditions quickly. However, there was one time when I was driving in the mountains, and the temperature suddenly dropped below freezing. After starting the car, the needle stayed at 1500 rpm for two minutes without moving, which startled me. Later, I discovered that the outdoor temperature sensor was covered in mud. Anyway, just remember this principle: it's normal for the rpm to be higher right after ignition, as long as it drops back to the 700–900 rpm range within two or three minutes. By then, the temperature gauge on the dashboard should also start moving.
