What are the causes of high engine idle speed?
1 Answers
The causes of high engine idle speed are: 1. Excessive oil accumulation and carbon deposits in the throttle body; 2. Weak spark due to spark plug failure; 3. Fuel line blockage or intake pipe malfunction; 4. Sensor failure causing the ECU to lose control; 5. Blown fuse or ignition module failure; 6. Poor fuel quality. The methods to address high engine idle speed are: 1. Clean or replace the idle speed control valve and perform basic idle speed setting using a dedicated decoder; 2. Locate and repair leaks, reseal or replace related components; 3. Adjust or replace the throttle position sensor; 4. Clean and inspect each fuel injector's spray volume to ensure no blockage or leakage; 5. Remove carbon deposits from the EGR valve or replace the EGR valve.