What causes slow throttle return?
2 Answers
Slow throttle speed return may be caused by excessively rich air-fuel mixture in the engine or malfunctioning sensors. Here is relevant extended information: 1. Principle: The normal operation of a car engine relies on numerous sensors and electronic devices. If certain sensors malfunction, it may affect the engine's normal operation. Sensors around the engine include oxygen sensors, air flow sensors, intake air temperature sensors, camshaft position sensors, coolant temperature sensors, etc. If any sensor malfunctions, it may cause the engine's air-fuel mixture to become too rich, resulting in almost no reduction in engine speed when releasing the throttle pedal. 2. Maintenance: During routine maintenance, technicians can use diagnostic computers to check for fault codes in the vehicle. This way, any issues with the electronic systems can be immediately identified. A car is not just a simple mechanical product but a complex high-tech device equipped with numerous electronic components and sensors. The proper functioning of a car depends on these electronic devices and sensors.
I've been driving for decades and encountered the issue of slow throttle return, where after releasing the accelerator pedal, the RPM drops very slowly, and the car responds sluggishly. The reasons vary, but the most common ones are a dirty throttle body or excessive carbon buildup, where oil residue blocks the intake ports, disrupting airflow. For electronic throttle systems, it could be a faulty throttle position sensor or malfunctioning computer control, causing signal transmission issues. For cable-operated throttles, cable sticking or insufficient lubrication is also common. This issue not only affects acceleration and fuel consumption but, more critically, makes manual transmission shifting less smooth, increasing the risk of stalling or jerking, which poses significant safety hazards. It's advisable to regularly clean the throttle body, check the air filter, and visit a repair shop if symptoms arise to prevent minor issues from escalating into major safety concerns.
