Step Initial Timing Adjustment

The first step involves correct adjustment of initial timing. The input sensor used by the ECU to determine initial timing is: 0 Standard Crankshaft Angle (G1, G2, and Ne)

The initial timing adjustment is critical to proper operation of the ECU controlled spark advance system. Initial timing is a function of the physical position of the distributor in the engine and becomes the base upon which all advance functions are added. Once the initial timing is adjusted properly, it will not change.

Crank Angl«

- Change in Initial Timing

• If distributor position in the engine is changed, the relationship between Ne and G signals to TDC changes.

• Any deviation from specified initial timing will cause an equal amount of error in the final spark advance angle.

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