Looks choppy, click on polynomial smoothing ONCE. Try toĬomplete this on the same day for best results as LTFT values can vary +-4% perĪnd +5, look at the VCM Editor>Edit>Engine>Airflow>Main VCM Scanner>Histogram display>LTFT are between -5 and +5. 10, SUBTRACT 10 from the (2000, 30) cell in the VCM Editor>Edit>Engine>Airflow>Main If the VCM Scanner>Histogram display>LTFT cell (2.0, 30) is The VCM Editor>Edit>Engine>Airflow>Main VE>Primary VE vs. To bring the VCM Scanner>Histogramĭisplay>LTFT cell (.8, 4.0) DOWN to 0 from 4 ADD 4 to the (.8, 4.0) cell in For example, In the VCM Scanner>Histogramĭisplay, the (.8, 40) cell, 800 RPM's and 40 kPa, is 4. To increase a LTFT value, a larger number or number farther awayįrom zero, SUBTRACT the difference between the LTFT value and zero and SUBTRACTįrom the corresponding cell in the VCM Editor>Edit>Engine>Airflow>Main 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 theĭifference between the positive LTFT value and zero to the corresponding cell Would be (67 )+(-4)=63, decreasing VE and thus reducingįuel. increasing the VE, which is adding fuel. If LTFT = (4), VE cell value is 67, result would be (67 )+(4)=71 Increasing the VE table value by the amount of the LTFT value. 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 Turn off the engine until the log is saved or it will be lost. Try to hitĪs many cells in the histogram as possible. LogĪbout 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 aboutĥ0 minutes or roughly 100 miles to allow for the PCM to relearn the fuel curve. Then Tools>VCM Controls>Fuel & Spark>Fuelĭ. When a MAF failure is indicated, this will assure optimal timing.ĭisplay. The computer reverts to the low octane table Don’t worry about the DTC at this time.Īdvance>Main Spark vs. Ensure that the P0103 DTC is enabled and youĪre seeing P0103 in the DTC list. This will set a P0103Ĭode and turn on the SES light. Open the VCM Editor>Edit>Transmission>Torqueĭiagnostics>General>MAF Sensor Fail Frequency = 0.

Transmission (M6) and continue to step 2.Ī. DISABLE ALL TORQUE MANAGEMENT – This willĮliminate all torque management within the PCM.

Obdwiz ls1 for tune