What Causes Unstable RPM in a Sagitar Manual Transmission?

[VioletMarie]

Sagitar manual transmission RPM instability may be caused by engine ECU programming and throttle response delay. Below are more details about RPM instability: 1. The electronic throttle is controlled by an idle speed motor with two position sensors. When the throttle pedal sensor receives a signal, the ECU controls the idle motor to open the throttle, with position sensors determining its position. When values from other vehicle sensors change, the ECU automatically adjusts throttle position. However, due to the electronic throttle's gradual deceleration program and inherent delay, RPM will temporarily rise when the clutch is depressed due to load disconnection. 2. During neutral coasting, unstable RPM with rhythmic needle fluctuations indicates ECU programming adjustments to the throttle. This relates to ECU programming - when vehicle speed signals exist without throttle pedal input, the engine ECU defaults to throttle compensation to address acceleration delay issues.