Why does the car rev up to 2000 RPM immediately upon starting?

[DiEvangeline]

It's likely a sensor signal issue, possibly caused by the newly changed engine oil that the engine hasn't adapted to yet. It will adjust after some use. Below is detailed information about automotive sensors: 1. Sensor: A detection device that can sense measured information and convert it into electrical signals or other required forms of output according to certain rules, meeting requirements for information transmission, processing, storage, display, recording, and control. 2. Features: Miniaturization, digitization, intelligence, multifunctionality, systematization, and networking. It is the primary link in achieving automatic detection and control. The existence and development of sensors give objects senses like touch, taste, and smell, gradually bringing them to life. Typically classified into ten major categories based on their basic sensing functions: thermal, photosensitive, gas-sensitive, force-sensitive, magnetic-sensitive, humidity-sensitive, sound-sensitive, radiation-sensitive, color-sensitive, and taste-sensitive elements.

[MichaelAnn]

My car also had this issue before where the RPM would suddenly surge to 2000 when starting. At first, I thought it was normal, but then realized something was wrong. There could be several reasons, such as a dirty throttle body getting stuck, causing unstable air intake control; or a faulty idle control valve that fails to adjust properly when it should slow down. Another possibility is sensor issues—if the coolant temperature sensor sends an error, the ECU might incorrectly command higher RPM. Additionally, an air leak in the intake pipe could introduce excess air, making the engine rev up. If this persists, it can lead to higher fuel consumption and potential engine damage. It’s best to visit a repair shop soon and use a diagnostic tool to check for error codes—don’t wait until it becomes a major problem. Regular throttle body cleaning can also help prevent this issue.

[KiraDella]

After starting, the RPM instantly jumps to 2000, and the car sounds like it's roaring, which is really annoying. I once encountered this issue in winter and thought it was due to the cold weather, but after checking, I found out it was either the idle speed motor malfunctioning or a vacuum pipe leak. It could also be caused by unstable voltage, problems with the battery or alternator, leading the ECU to misjudge and increase power. Don't underestimate this problem; over time, it can cause increased engine wear, make the ride less smooth, and increase noise. It's recommended to first check simple things like whether the air filter is clogged or if a plug is loose. If that doesn't solve it, take it to a professional shop to avoid affecting driving safety.

[VanClayton]

My old car often does this, the RPM spikes when starting, which is quite startling. It's usually an issue with the idle control system, like a faulty sensor or carbon buildup in the throttle body jamming the opening. An air intake leak can also cause erratic RPM fluctuations, making the car noisy and fuel-inefficient. It needs to be addressed promptly—better have a mechanic check it out to prevent further damage.