4/16/2024 0 Comments Tuning factory ls ecu![]() ![]() To increase a LTFT value, a larger number or number farther away from zero, SUBTRACT the difference between the LTFT value and zero and SUBTRACT from the corresponding cell in the VCM Editor>Edit>Engine>Airflow>Main VE>Primary VE vs. To decrease LTFT values, a smaller number or number closer to zero, ADD the difference between the positive LTFT value and zero to the corresponding cell in the VCM Editor>Edit>Engine>Airflow>Main VE>Primary VE vs. If the LTFT was (-4), the result would be (67)+(-4)=63, decreasing VE and thus reducing fuel. If LTFT = (4), VE cell value is 67, result would be (67)+(4)=71 - increasing the VE, which is adding fuel. The operation is opposite for negative LTFT's.* Richen this cell by increasing the VE table value by the amount of the LTFT value. Positive LTFT's indicate fuel is being added because of a lean condition. The goal is to get ALL LTFT’s between -5 and +5. Open the VCM Editor>Edit>Engine>Airflow>Main VE and select Primary VE vs. Go to VCM Scanner>Histogram display>LTFT's. Do NOT turn off the engine until the log is saved or it will be lost. Try to hit as many cells in the histogram as possible. Log about 30 minutes of driving at many different speeds and conditions. Try not to enter PE mode while driving and logging for this procedure. Changes to the LTFT’s do not take effect immediately – the PCM requires about 50 minutes or roughly 100 miles to allow for the PCM to relearn the fuel curve. Then Tools>VCM Controls>Fuel & Spark>Fuel Trim Learn>Reset Fuel Trims. The computer reverts to the low octane table when a MAF failure is indicated, this will assure optimal timing.*Ĭ. Copy the High Octane table to the Low Octane table. In the VCM Editor>Edit>Engine>Spark Advance>Main Spark vs. Don’t worry about the DTC at this time.ī. Ensure that the P0103 DTC is enabled and you are seeing P0103 in the DTC list. This will set a P0103 code and turn on the SES light. In the VCM Editor>Edit>Engine Diagnostics>General>MAF Sensor Fail Frequency = 0. Set Abuse Mode RPM, Abuse Mode TPS and Abuse Mode Speed = 0ĭ. Open the VCM Editor>Edit>Transmission>Torque ManagementĬ. Ignore this step for a standard transmission (M6) and continue to step 2.*Ī. 1.ĝISABLE ALL TORQUE MANAGEMENT – This will eliminate all torque management within the PCM.
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