What Causes Excessive Idle Control Speed?
1 Answers
The reasons for excessive idle control speed are as follows: Specific causes: Idle switch not closing; Faulty idle control valve; Intake manifold air leak; Incorrect valve timing; Fuel injector dripping or clogging; Exhaust system blockage; EGR valve opening during idle conditions. Solutions: Adjust or replace the throttle position sensor; Clean or replace the idle control valve and use a dedicated decoder for basic idle setting; Locate and seal leaks or replace related components; Check timing marks and readjust valve timing according to standards; Clean and inspect each fuel injector's spray volume to ensure no clogging or dripping; Replace the three-way catalytic converter; Remove carbon deposits from the EGR valve or replace the EGR valve.