What is the high idle speed of Cherokee?

As for the analysis of the situation you reflected, the reason may be that the idle speed control device is stuck or beyond its adjustment range because of the carbon deposit blocking the idle speed passage, or that the throttle valve is stuck because of too much carbon deposit, which leads to the increase of idle speed after receiving oil. Many times, after cleaning the throttle, the idle speed of oil collection will rise. This is because when cleaning the carbon deposit, the carbon deposit solution enters the throttle shaft, causing the throttle shaft and the valve body base to get stuck. I hope my answer is helpful to you.

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