From Jan. 1994

PURPOSE
Fuel injectors supply highly atomized fuel at the intake port to ensure optimum combustion efficiency.
A new air shroud injection system is used which allows additional metered air to be drawn into the combustion chamber thus lowering CO/HC emissions.





OPERATION
The metered air drawn into the combustion chamber via the injectors is taken from a fitting located in the intake system bellows boot in front of the throttle body (ported vacuum). Due to the pressure differential, ported vs. manifold vacuum at the injector tip, the system is self-regulating with greater airflow to reduce emissions in the idle and low part load engine ranges, i.e., (large pressure differential) more air drawn in versus less airflow during high part load and full load engine ranges, i.e., (small pressure differential) less air drawn in.





The air shrouded injectors incorporate a hose fitting on the outer injector body which connects each injector, via a rubber hose, to the new idle control valve molded hose, located under the intake manifold. The gap between the inner and outer body of the fuel injector guides the metered air and allows it to disperse and mix with the injected fuel at the injector tip (improved fuel atomization).