Ignition/Tuner/ECM/Fuel InjectionNeed advice on ignition issues? Questions about a tuner? Have questions about a EFI calibration or Fuel Injection? Tips on Engine Diagnostics, how to get codes, and what they mean. Find your answers here.
From what I understand the factory ECM can only adjust the fuel about 1/2 percent, if this were not the case they would have used a mass airflow sensor and you could put any exhaust and A/c within reason and it would automatically re-set the fuel.