1. Idle Air Control (IAC) Valve: The IAC valve is responsible for controlling the amount of air that bypasses the throttle body when the engine is idling. A faulty or dirty IAC valve can cause the engine to idle higher than normal.
2. Throttle Body: A dirty throttle body can also lead to high idle issues. Over time, carbon deposits can build up on the throttle body, restricting airflow and causing the engine to run rich, resulting in a higher idle.
3. Vacuum Leaks: Vacuum leaks can cause the engine to run lean, which in turn can lead to a high idle. Inspect all vacuum hoses for any cracks, tears, or loose connections.
4. Oxygen Sensor: A faulty oxygen sensor can provide incorrect information to the engine's computer, which can cause the fuel mixture to be off and lead to a high idle.
5. Transmission Linkage: If the transmission linkage is not adjusted correctly, it can cause the transmission to remain in a higher gear while in park, which can result in a high idle.
It is important to identify and address the underlying cause of the high idle to ensure the proper functioning of the vehicle. If the problem persists, it is recommended to take the Land Cruiser to a qualified mechanic or service centre for further diagnosis and repair.
