What Causes High Idle Speed in Small Cars?

[MilesRose]

High idle speed in small cars is caused by the idle switch not closing, a faulty idle control valve, or intake pipe leakage. Reasons for excessively high idle speed in small cars: Idle switch not closing, faulty idle control valve, intake pipe leakage, incorrect valve timing, fuel injector dripping or clogging, exhaust system blockage, EGR valve opening during idle conditions. Solutions for high idle speed in small cars: Adjust or replace the throttle position sensor, clean or replace the idle control valve, use a diagnostic tool to perform basic idle speed settings. Locate leakage points and reseal or replace relevant components. Check timing marks and readjust valve timing according to standards. Clean and inspect each fuel injector's spray volume to confirm any clogging or leakage. Replace the three-way catalytic converter. Remove carbon deposits from the EGR valve or replace the EGR valve.