Why Does the Car's RPM Increase?

1 Answers
Mila
07/25/25 4:08am
An increase in vehicle RPM may be caused by faults in the engine's intake system or fuel system. Below are specific details about engine RPM: 1. During a cold start, if the engine idle speed is below 800/min or above 1200/min, it indicates poor engine condition. 2. While driving, try to avoid letting the engine operate below 2000r/min. If the RPM is too low, the engine will lack power, and operating under heavy load at low RPM can cause damage to the engine and easily lead to carbon buildup. 3. When the engine operates above 4000r/min, the combustion time shortens, leading to incomplete fuel combustion and a significant increase in fuel consumption. If driving in fifth gear at this RPM, the speed usually reaches 150km/h, which is already a dangerously high speed. 4. The most economical and optimal engine operation occurs between 2200~3500r/min. It is advisable to keep the RPM within this range during regular driving.
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