What Causes High Idle Speed in Cars?
1 Answers
Here is a detailed explanation of the causes and solutions for high idle speed in cars: 1. Throttle valve sticking or not closing properly: If the engine idle speed drops to normal when the throttle lever is pushed in the closing direction, it indicates throttle valve sticking or improper closure. Solution: Replace the cable, remove the sticking parts, and clean the throttle body. 2. Additional air valve malfunction. Solution: Replace the additional air valve. 3. Idle speed control valve failure: Check for the sound of the idle speed control valve operation. If there is no sound, the control valve is faulty. Solution: Replace the control valve. 4. Water temperature sensor failure. Solution: Input an artificially low water temperature signal to the ECU. 5. Air conditioning switch or power steering pressure switch failure. 6. Crankcase forced ventilation valve failure. Solution: Replace the crankcase forced ventilation valve. 7. Air intake system leakage. Solution: Locate the leak, reseal or replace the relevant components. 8. Generator charging voltage too low. Solution: Inspect and repair the engine.