What Are the Consequences of Shifting to Neutral While Driving?
3 Answers
Consequences of shifting to neutral while driving: does not save fuel, reduces engine lifespan, causes loss of vehicle control, and severely damages the transmission. Details are as follows: Does not save fuel: When the engine speed exceeds 1200 RPM, the fuel injection system stops injecting fuel when the throttle is released. However, if shifted to neutral, the engine speed will inevitably drop below this baseline, causing the fuel injection system to inject fuel, which actually does not conserve fuel. Reduces engine lifespan: When the engine is idling, the fuel concentration in the cylinders is relatively high, which can easily lead to carbon buildup, wear on the cylinders, and a reduction in engine lifespan. Causes loss of vehicle control: In emergency situations, the inability to promptly restore power can result in loss of vehicle control, endangering safety. Moreover, most drivers cannot quickly shift to the correct gear based on the actual situation during emergencies. Severely damages the transmission: If an automatic transmission vehicle is driven in neutral, it may directly cause severe damage to the transmission. This is because the output end of an automatic transmission is directly connected to the drive wheels, while the lubrication system is linked to the engine. Therefore, shifting to neutral at high speeds can lead to insufficient lubrication and burnout of the transmission. Detailed information on car gear speeds: Speed ranges: First gear corresponds to 0-5 km/h, second gear to 5-20 km/h, third gear to 20-40 km/h, fourth gear to 40-60 km/h, and fifth gear to 60-100 km/h.
I've been driving trucks for over a decade, and coasting in neutral is absolutely not advisable! Especially when going downhill, the vehicle loses engine braking force, causing the brake pads to work overtime. Last week, a young guy in our fleet almost hit the guardrail because his brakes overheated and failed due to this. In neutral, power steering also becomes heavier, making the steering wheel as hard to turn as lifting a brick—impossible to maneuver in an emergency. Modern cars are even more problematic; putting an automatic transmission in neutral can trigger a transmission fluid temperature warning, with repairs costing over ten thousand yuan. I used to think it saved fuel, but the onboard computer showed that coasting in neutral actually consumes 3% more fuel than engine braking—totally not worth it.
As a frequent customer of auto repair shops, I've personally experienced the pitfalls of coasting in neutral. Last year, while driving a manual transmission car downhill in neutral, the transmission synchronizer wore out and started making strange noises, costing over 2,000 yuan to fix. The mechanic later explained that neutral disconnects the engine from the drivetrain, causing gears to lose lubrication and wear out faster. Automatic transmissions are even more delicate—coasting in neutral leads to insufficient hydraulic pressure, causing planetary gears to grind dry. It's also dangerous in emergencies. Once, an electric scooter suddenly darted out at an intersection, and I couldn't accelerate quickly to avoid it while in neutral, nearly causing a collision by half a meter. Braking distance increases too—tests show that emergency braking at 60 km/h in neutral adds over 2 meters compared to braking in gear.
