What Causes Sudden RPM Increase Without Pressing the Accelerator?

1 Answers
McLorenzo
07/30/25 4:40am
Sudden RPM increase without pressing the accelerator may be due to a throttle malfunction or a faulty sensor near the throttle. How the accelerator controls throttle opening: When the driver presses the accelerator pedal, it doesn't directly control fuel injection but rather adjusts the throttle opening. As the throttle opening increases, more air enters the engine, and the ECU simultaneously commands the fuel injection system to increase fuel delivery. Sensors are crucial for proper engine operation: Numerous sensors surround the engine, including oxygen sensors, air flow sensors, intake temperature sensors, knock sensors, throttle position sensors, camshaft position sensors, and coolant temperature sensors. A malfunction in any of these sensors can disrupt normal engine operation. If the engine RPM suddenly increases while driving without pressing the accelerator pedal, it indicates a potential issue with certain sensors.
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