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Whenever we start our car, the RPM engine spikes to about 2000-3000 RPM and immediately drops to 1200 RPM. After hitting 1200 RPM, it falls to 600-800 RPM. Why does it happen?
- Cruise Control failed at 220km/hr speed – Saudi tells the story.
It is normal for a cold engine to start with high RPM; it will drop immediately after warming up, especially when the engine is trying to heat itself up. This is called the cycling of RPM.
Stage 1 – Starting the car
When we start the car, the RPM rises to 600-800 points for a fraction of a second, and then a fuel bunch is drained into the car’s engine.
Stage 2 – RPM goes up
As soon as the fuel is injected into the car engine, it runs at a higher RPM (2000-3000) for a limited time.
Stage 3 – RPM comes down
When the car’s RPM goes up to 2000-3000, it increases the temperature, which reaches the peak-point operating temperature, and after that, RPM drops to around 1200 first and then in the range of 600-800.
RPM Spike in New Cars
In modern vehicles, these steps are controlled by the Engine control unit (ECU); therefore, you do not see RPM going up when you start the car.
ECU is an electronic control unit that receives feedback from different sensors which specify the temperature of the particular engine, the incoming volume of air, density, fuel burn ratio, and many other things.
How long to wait before driving?
Whenever we start a car, one of the best things we should do is turn on the car engine and wait for 10-30 seconds.
After 30 seconds, start driving slowly. This way, we can warm the car’s engine to its optimal temperature.