* Idle air control valve (IACV): This valve regulates the amount of air that bypasses the throttle body when the engine is idling. If it's stuck open or not functioning properly, it can cause the engine to idle too high.
* Throttle position sensor (TPS): This sensor tells the engine control module (ECM) how far the throttle plate is open. If the TPS is out of adjustment, it can send an incorrect signal to the ECM, causing the engine to idle too high.
* Vacuum leaks: If there are any vacuum leaks in the engine, it can cause the engine to lean out and idle too high.
* Fuel injector issues: If one or more fuel injectors are stuck open, it can cause the engine to run rich and idle too high.
* Computer Issues: Faulty wiring or a faulty ECM can also lead to high idling.
To pinpoint the exact issue, a qualified mechanic or technician will need to perform a diagnostic inspection of your Ford Festiva. They will be able to check the aforementioned components, check computer diagnostics, and determine what repairs or adjustments are needed to get your vehicle idling properly again.
