Is High Idle Speed Dangerous for a Car?
2 Answers
High idle speed is not particularly dangerous, but it does consume more engine power. Below is an introduction to vehicle idle speed-related knowledge: 1. Definition of Idle Speed: Idle speed refers to the condition where the car is started without any load or need to perform external work, and the engine maintains the lowest and most stable speed by controlling the throttle solenoid valve's air intake through the onboard ECU. 2. Idle Speed Range: Generally, the normal idle speed for a car is around 600 to 800 RPM, though some models may have an idle speed of up to 1000 RPM. 3. Consequences of Idle Speed: The hazards of high idle speed include increased fuel consumption, higher engine operating temperatures, and increased mechanical wear. If the idle speed is too low, it may also lead to the vehicle stalling while driving.
I've been driving for over a decade and have encountered high idle speed situations, which indeed pose safety hazards. For instance, when waiting at a traffic light, if the engine speed suddenly surges, the car can become unstable or feel impulsive. At this point, if the brakes fail or the driver is distracted, it may lead to scraping the vehicle in front or losing control. High idle speed is often caused by carbon buildup in the throttle body, malfunctioning air flow sensors, or idle motor failures, resulting in incomplete fuel combustion, engine overheating increasing the risk of knocking, and possibly accelerating component wear. Prolonged neglect can also significantly increase fuel consumption, exceed emission standards, and even cause delayed response during emergency braking. For safety reasons, I usually take my car to the repair shop immediately upon discovery to clean the throttle body and check the wiring, preventing problems before they occur.
