How to Troubleshoot Fluctuating Idle Speed?
1 Answers
Troubleshooting methods for fluctuating idle speed: Adjust the idle speed by turning the throttle opening adjustment screw to allow the engine to operate at a lower stable speed. Idle speed is an operational condition of a vehicle, referring to the engine running in neutral gear. The engine speed during idling is called the idle speed, which can be adjusted by modifying the throttle size. Causes of fluctuating idle speed: 1. Excessive carbon buildup in the throttle body; 2. Leaks in the intake manifold or various valves; 3. Faulty valve timing; 4. Clogged three-way catalytic converter; 5. Faulty fuel injector; 6. Low fuel pressure; 7. Engine misfire; 8. Excessive or insufficient ignition advance angle.