Fox 1.6 Idle speed 840 rpm Throttle opening 13.3%

The normal idle speed of Fox is around 800 rpm. If the speed is abnormal, it may be caused by the following points: the most common thing is that the throttle is dirty or the throttle fails, which will lead to idle jitter. The main reason of dirty throttle is that there is carbon deposit at the joint between throttle valve plate shaft and throttle body, which leads to inaccurate throttle opening, so idling jitter will occur.