Installation manual

90-898305
1-62
Compressor Notes: To aid in starting when the air rail pressure is low and
before the compressor has time to build pressure, the direct injector is held
open by the ECM. This allows the compression from inside the cylinders to
pressurize the air rail faster (1 or 2 strokes, or 60° of crankshaft rotation).
Idle Notes: Idle quality is controlled by fuel volume and fuel timing. The
throttle shutters will be open at idle speeds. The shift cut-out switch will
interrupt the fuel to 3 of the cylinders to assist in shifting.
The TPS signals the ECM to change the fuel and spark without movement of
the throttle shutters. The throttle cam is manufactured to allow the TPS sensor
shaft to move before opening the throttle shutters.
Notes
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