Grouped Injection

Injectors are grouped into pairs. The pairs consist of two consecutive cylinders in the firing order; each pair is driven by a separate driver circuit. Four cylinder engines use two groups, six cylinder engines three groups, and the 1UZ-FE V8 engine uses four groups of injectors.

Injection is timed to deliver fuel immediately preceding the intake stroke for the leading cylinder in the pair. The entire group is pulsed once per engine cycle, delivering the entire calculated charge of fuel. This timing method ensures that fuel does not linger behind the intake valve, thereby, reducing emissions, improving fuel economy and throttle response.

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