What are the causes of high car idle speed?

1 Answers
DiGage
07/29/25 11:48am
The causes of high car idle speed are: 1. Throttle stuck or not closing properly; 2. Idle speed control valve failure; 3. Coolant temperature sensor failure; 4. Air intake system leakage; 5. Air conditioning switch or power steering pressure switch failure. The solutions are: 1. Check the operation sound of the idle speed control valve. If there is no sound, it indicates a fault in the idle speed control valve; 2. Locate the leakage in the air intake system and reseal or replace the relevant components; 3. Measure the fuel injection volume of the injector. If the injection volume exceeds the standard, the injector may be dripping. When the engine is running without load, it is called idle speed. When the accelerator pedal is fully released during engine operation, the engine is in idle speed condition. The engine speed during idle is called idle speed, which can be adjusted by changing the throttle opening size and other methods.
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