- Faulty Idle Air Control (IAC) Valve: The IAC valve regulates the amount of air that bypasses the throttle plate, helping maintain a steady idle speed. A faulty IAC valve can cause the idle speed to drop and stall.
- Stuck or Dirty Throttle Body: A stuck or dirty throttle body can prevent the engine from getting enough air, causing it to stall.
- Faulty Oxygen (O2) Sensor: The O2 sensor monitors the oxygen content in the exhaust and adjusts the fuel mixture accordingly. A faulty O2 sensor can provide incorrect data, leading to a lean or rich fuel mixture, which can cause idle issues and stalling.
- Fuel Pressure Problems: Low fuel pressure can cause the engine to run lean and eventually stall. This can be caused by a faulty fuel pump or a clogged fuel filter.
- Vacuum Leaks: Vacuum leaks can also cause the engine to run lean and stall. Check for loose or cracked vacuum hoses around the engine.
To diagnose the specific problem, it's recommended to have a qualified mechanic perform further testing and inspections. They can diagnose the cause and recommend the appropriate repairs to ensure your Mustang idles and runs smoothly.
