What Causes the Automatic Acceleration Phenomenon?

[AxelLynn]

Automatic acceleration phenomenon may occur due to the following reasons: Dirty Throttle: A severely dirty throttle with excessive carbon buildup can cause unstable idle control, sometimes leading to the engine automatically increasing its RPM. The solution is to clean the throttle. Electromagnetic Interference: Electromagnetic interference in the electronic control system can disrupt the voltage signal output from the accelerator pedal, causing unstable signals and affecting engine speed control. The solution is to repair the electronic control system and avoid sources of interference. High Engine Idle: Improper adjustment of the throttle cable or throttle position sensor can result in excessively high main oil circuit pressure and delayed gear shifting.

[VonAdriana]

Once when I was driving on the highway, the car suddenly accelerated on its own, which scared me so much that I immediately hit the brakes. Later, I found out the possible causes could be a stuck throttle cable or a faulty electronic throttle sensor. In older cars, if the throttle cable is aged or stuck, the engine will continuously supply fuel, causing acceleration. In newer cars, common issues include sensor failures, such as a malfunctioning throttle position sensor or the cruise control being accidentally activated. Additionally, if there's a bug in the engine control unit (ECU) software, it can also command acceleration. I remember this happening once after a rainy day when the sensor got damp. In any case, if you experience unintended acceleration, don't panic—immediately shift to neutral or pull over for inspection. Regularly check the throttle system and clean the throttle body as a preventive measure.

[VonEliza]

During vehicle maintenance, I've encountered numerous cases of unintended acceleration, with the most typical being throttle valve sticking or electronic control module malfunctions. If excessive carbon buildup occurs in the throttle body, it may stick in the open position, causing the engine to run at high RPMs. For electronic throttle systems, sensor failures such as pedal position sensor malfunctions, or cruise control actuator faults sending erroneous acceleration signals could be the cause. Additionally, the fuel system should be inspected - for instance, a faulty fuel pressure regulator may cause excessive fuel delivery. It's recommended to use a diagnostic scanner to check for trouble codes first. For simple cases, try cleaning the throttle body yourself; for complex issues, seek professional repair immediately rather than waiting for an accident to occur.

[Gracie]

Unintended acceleration is absolutely a safety hazard. Sudden speed increases while driving can lead to rear-end collisions or loss of control at any moment, so extreme caution is necessary. The causes are often intertwined mechanical or electronic failures. For example, in older vehicles, a broken throttle spring can get stuck, preventing the throttle pedal from returning. In newer cars, software issues are common, such as the ECU misreading sensor data or ABS sensors providing incorrect speed feedback. Improper modifications can also introduce interference, like aftermarket electronic components affecting the original system. If encountered, immediately turn on hazard lights, pull over, shut off the engine, and check fuses and wiring. Do not attempt to continue driving—prioritize safety by heading straight to a workshop for a thorough inspection.