Is It Normal for Idling to Only Reach 4000 RPM?

1 Answers
ColtonLynn
07/30/25 7:55am
This is a normal situation. Here are the relevant details. 1. Under normal conditions: A 1.5-liter displacement car can generally rev up to 5000 to 6000 RPM during idling, unless the vehicle's computer program is set to limit it to a maximum of 4000 RPM. There is no issue in actual driving, and this is considered normal. During regular driving, the engine speed is mostly between 1500 and 2500 RPM. 2. Internal reason: Vehicles are typically equipped with an idling protection function. The absence of this function would be abnormal. A 1.5-liter displacement engine should at least be able to rev up to around 6000 RPM during idling.
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