What are the reasons for the throttle RPM not increasing?

2 Answers
OSophie
07/24/25 7:41pm
Throttle RPM not increasing reasons are: 1. Damaged spark plugs; 2. Poor fuel quality; 3. Unstable oil pressure. The throttle, also known as the air valve or throttle valve, refers to the control device that regulates engine power (thrust). In piston aircraft engines, the throttle controls the carburetor's throttle opening to regulate cylinder filling, thereby determining the engine's output power. In gas turbine engines, the throttle controls the metered fuel flow of the fuel regulator, thus determining the thrust generated by the engine. The throttle position is manipulated by the pilot in the cockpit via the throttle lever, transmitted through control system components such as pushrods, rocker arms, torque tubes, cables, pulleys, and sector gears to the carburetor or fuel regulator on the engine.
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Selena
08/11/25 10:51am
I've encountered the situation where the engine speed doesn't increase when pressing the accelerator several times. Most often, it's caused by fuel system issues - either the fuel pump is about to fail leading to insufficient fuel supply, or a clogged fuel filter preventing the engine from getting enough 'food'. Air intake system problems are also common - when the air filter is too dirty and clogged with dust, fresh air can't enter the engine when you step on the gas, making it 'short of breath'. Electronic component failures occur frequently too, like throttle position sensor malfunctions causing the ECU to misjudge and think you're lightly pressing the pedal. Additionally, aging spark plugs in the ignition system can reduce combustion efficiency. Remember not to underestimate these issues - delaying repairs can easily lead to accidents. Clean the air filter and check the fuel system during every maintenance service for safer driving. If the RPM won't increase, you really should get it checked at the shop immediately.
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