Eight-generation Accord 2.4 has high idle speed.

There are two main considerations for the high idle speed of the 8th generation Accord. 1 aspect is the throttle problem. Check whether there is serious carbon deposit in the throttle valve, which causes the idle intake air to be transferred out of the normal range. Second, check whether the air intake system leaks. If the air intake system leaks, some air will enter the intake pipe without passing through the air flow sensor, resulting in excessive idle speed.