Hi everyone

I want to use a PIC or even a stamp to manipulate fuel injector pulses,
mainly reduce the pulse width. I really don't want to utilize individual
injector drivers (for sequential injection systems) that will complicate the
project. As you are probably aware sequential systems usually use an
individual driver for each injector. One side of all the injector has a
common 12v source to all injectors and the individual drivers (sink) control
the ground.

I was wondering if it is possible to modulate the 12v power line which is
common to all injectors. For example say the PIC measures the previous
injector pulse at 5 msec and I want the injector to pulse 2.5 msec on its
next fire. Could I allow the injector to fire normally and cut the power at
2.5 msec (to shut off the injector) and turn power on again in time for the
next injector firing? I am not sure what effect the  rise and fall times of
the power supply will have on injector firing or operation.

If this is possible, I would just need one power control circuit to trim 4-8
injectors. I could easily use a PIC to measure the pulse, allow the initial
injector firing to happen on schedule and trim each injector by controlling
the power source which is common to each injector.

What do you think?

Any comments or suggestions for hardware that could accomplish this?

Thanks in advance

Jon