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What harm does coasting in neutral downhill cause to the car?

1 Answers

DiBrady

07/30/25 3:41am

Coasting in neutral downhill can cause the following harm to the car: 1. Coasting in neutral makes the engine prone to knocking, as the explosive force of the fuel cannot fully perform work, impacting the connecting rod mechanism and causing premature wear. Additionally, due to insufficient low-speed torque, acceleration becomes weak; 2. Most fuel-injected engines reduce or stop fuel injection during braking or downhill driving. However, when coasting in neutral, the engine is considered to be in an idle state, leading to additional fuel injection and increased fuel consumption; 3. Without the engine's traction resistance, the vehicle speed will continuously increase, extending the braking distance and placing a greater burden on the braking system; 4. The likelihood of the car stalling increases when coasting in neutral. If the car stalls for any reason, it will immediately lose power steering and brake assistance, making the vehicle completely uncontrollable and prone to accidents.

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