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What is the reason for the sudden increase in idle speed when stepping on the brake?

1 Answers

BraxtonAnn

07/30/25 5:44am

The reason for the increase in engine speed when stepping on the brake may be due to a faulty ignition coil, resulting in insufficient ignition energy; a dirty throttle, leading to abnormal air-fuel mixture; a vacuum booster system leak, causing insufficient system vacuum; or a transmission or engine electronic control system malfunction, resulting in unstable operation when braking. Below is relevant information: 1. Engine speed: The higher the engine speed, the more work is done per unit of time, so the power is greater. However, higher speeds accelerate the entire cycle, causing fuel to be expelled before it has enough time to fully combust. Therefore, fuel consumption increases exponentially. Thus, higher speed is not always better. The speed should mainly be determined by the vehicle's speed and gear. Maintaining around 3000 RPM is sufficient. Additionally, avoiding low-gear high-speed and high-gear low-speed driving is essential, as both are harmful to the engine. 2. Emergency braking: When performing emergency braking, press the brake pedal firmly. Most vehicles without ABS systems are not recommended to brake with full force at once; instead, brake in two separate steps to prevent wheel lock-up, which can lead to skidding and steering lock. However, ABS systems are now standard in vehicles, so in emergency situations, it is crucial to press the brake pedal with full force.

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