What are the causes of high idle speed in sedans?

1 Answers
ColemanDella
07/30/25 5:42am
The causes of high idle speed in sedans are: 1. The idle switch does not close; 2. Malfunction of the idle control valve; 3. Air leakage in the intake pipe; 4. Incorrect valve timing; 5. Fuel injector dripping or clogging; 6. Blockage in the exhaust system; 7. The EGR valve opens during idle conditions. Solutions for high idle speed in sedans: 1. Adjust or replace the throttle position sensor; 2. Clean or replace the idle control valve, and use a decoder to perform basic idle speed setting; 3. Locate the leakage point, reseal or replace related components; 4. Check the timing marks and readjust the valve timing according to standards; 5. Clean and inspect the fuel injection volume of each injector and confirm for any blockages or leaks; 6. Replace the three-way catalytic converter; 7. Remove carbon deposits on the EGR valve or replace the EGR valve.
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