The following instructions assume that all pre-start set-up instructions given in previous sections have been completed. Only after all pre-start checks have been made should an attempt be made to crank the engine. The following steps must be performed before an attempt is made to start the engine to ensure the G4X ECU is calibrated to precisely measure engine position.

1.Connect the ECU to PCLink.

2.Select 'Fuel', then 'Fuel Set-up':

a.Set ‘Injection Mode’ to OFF. This will prevent the engine from trying to start while the triggers are calibrated.

b.Perform a Store (press F4) to make sure fuelling is not re-enabled if power to the ECU is lost.

3.Click on ‘Triggers’ then ‘Calibrate Triggers’.

4.Perform the correct trigger calibration procedure specific to your vehicle as described in the PCLink help (Press F1).

Note that trigger calibration must be performed again once the engine is running. Due to the acceleration and deceleration of the crankshaft at low speeds, an inaccurate measurement of engine timing is usually made. Also it is often harder to see timing marks with a timing light at slow engine speeds. Trigger calibration should be checked again at between 2000-4000 RPM where engine speed is stable and a more consistent timing reading can be obtained.

 

A more in depth explanation is provided in the PCLink help Manual under G4X ECU Tuning Functions -> Triggers -> Calibration.

 

Note: On Rotary Engines check both the leading and trailing spark positions when determining the trigger offset.