Idle Air Control (IAC) Valve Issues:
- The IAC valve regulates the amount of air that bypasses the throttle plate, helping maintain a steady idle speed. A faulty IAC valve can lead to unstable idle or stalling. Check the valve for dirt, debris, or malfunctioning solenoids and clean or replace it if necessary.
Vacuum Leaks:
- Inspect the vacuum lines and fittings around the engine for leaks. Leaks can disrupt the proper air-fuel mixture, leading to rough idle or stalling.
Faulty Throttle Position Sensor (TPS):
- The TPS provides information about the throttle plate's position to the engine computer. A faulty TPS can provide incorrect signals, causing the engine to run too lean or rich and leading to stalling.
Fuel Pressure Problems:
- Incorrect fuel pressure can affect the engine's ability to stay running. Check the fuel pressure using a fuel pressure gauge and compare it with the manufacturer's specifications. A failing fuel pump, clogged fuel filter, or faulty fuel pressure regulator can be potential culprits.
Dirty Throttle Body:
- Over time, the throttle body may accumulate carbon deposits, affecting its performance. Clean the throttle body and its components to ensure proper airflow.
If the issue persists or if you're not comfortable performing the checks or repairs yourself, it's best to take the vehicle to a professional mechanic for diagnostics and repairs.
