Questions and Answers

Injector Firing Q. I have a 1996 Ford Taurus GL with a 3.0 V-6 engine which runs fine but I do have a question about the timing of the fuel injectors. My Taurus repair manual indicates the six fuel injectors to be wired in two banks of three which would result in three injectors firing at the same time?

Is this true and if so how can this be? Would love to hear an explanation.

Thanks,
Glenn

A. You are correct, each bank of three injectors do fire at the same time. On most older EFI engines all the injectors fired at the same time.

The reason this is done is to make injector control a little simpler. On most modern cars each injector fires just before its intake valve opens.

In systems that fire injectors all at once or in banks, the injector only injects half the fuel required. The chamber around the intake valve holds the fuel charge until the next injector pulse. When the intake valve opens, the combined fuel from the two pulses is drawn into the cylinder where it is burned.

Now some cylinders will have two injector pulses before the intake valve opens and some will have one stored charge and the second charge comes as the valve opens. It depends on when the pulses occur in the cycle.

Systems that use this system are refered to as Sequential Fuel Injection (SFI) while systems that use one pulse per cylinder as the intake opens id called Multi-point Fuel Injection (MFI)

Additional Information provided courtesy of ALLDATA