2013 Mustang GT Procharger Stage 2 Kit Issues

There is an "Idle Relearn Procedure" from BAMA tunes that may help.


This is a hybrid method based on what works in practice on Fords of similar era. Use at your own risk; “relearns” can vary by calibration or PCM version.


— Preconditions —
• Good battery, healthy charging system
• Throttle body and IAC (or equivalent) clean
• No active faults (check engine light off)
• All accessories off (radio, lights, blower, etc.)

Procedure:

1. Start engine; leave it to idle (in Park or Neutral) until it reaches **full operating temperature** (coolant temp stable).
2. Let it idle for about **1 minute** with **A/C off** and no extra loads.
3. Turn the **A/C on**, but leave blower low or as usual, let it idle for **another minute**.
4. Drive the car **under light load** (no heavy throttle) for some miles (5-10 mi or so) to let the PCM adjust fuel trims, adaptives, idle targets, etc.
5. Optionally, you can shut engine off, wait a bit, restart, and observe idle. If idle is still unstable, repeat steps above.


If you have a scan tool that supports “Throttle Body or Idle Learn / Relearn” functions, use that after battery disconnection or when replacing throttle body / sensors.