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What does 'empty throttle' mean?

2 Answers

LaElizabeth

09/03/25 8:21am

This is an issue related to downshifting in older vehicles. For cars without synchronizers, in order to match the rotational speeds of the two gears during gear engagement, the 'empty throttle' technique is used. When the transmission is in neutral and the clutch is engaged, the 'empty throttle' is applied to synchronize the rotational speed of the front part of the transmission gears with the rear part driven by the driveshaft. This allows smooth gear engagement without gear grinding. Below is additional information about the throttle: 1. Introduction: The throttle, also known as the 'accelerator' or 'throttle valve,' is a control device that regulates engine power (thrust). In piston aircraft engines, the throttle controls the opening of the carburetor's throttle valve to adjust the cylinder's air-fuel mixture, thereby determining the engine's output power. In gas turbine engines, the throttle regulates the fuel flow through the fuel controller, determining the engine's thrust. 2. Function: The throttle pedal, also called the accelerator pedal, is part of the vehicle's fuel supply system. By adjusting the pedal's depression, it controls the throttle valve opening, regulates air intake, and allows the engine control unit (ECU) to adjust fuel injection, thereby controlling the engine's speed.

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OCatherine

09/16/25 2:53am

I've been driving for almost twenty years, and the term "empty oil" doesn't sound very common, but when it comes to fuel consumption in neutral gear, I've had my fair share of experience. I remember driving an old manual transmission car, always shifting to neutral when coasting downhill to save fuel. I thought it would help, but actual tests showed that with lower engine RPM, fuel consumption actually increased because the idle fuel injector was still working, averaging an extra half-liter of fuel per kilometer coasted. Nowadays, many automatic transmission cars shouldn't be shifted into neutral at all—not only does it waste fuel, but it can also raise the transmission oil temperature and shorten its lifespan. After breaking this habit myself, my fuel consumption dropped significantly. If any friends ask, I suggest checking the user manual directly—don't believe the myth that neutral gear saves fuel. Safety always comes first.

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