Injector Firing Voltage

Bruce Plecan nacelp at bright.net
Sat May 15 20:12:22 GMT 1999


I hooked the scope up to a GM ecm running 8 saturated injectors.  The normal
12v only appreared rarely.  The usual voltage of the injectors firing was
75-100v..
So this flyback/kickback, is a very large issue.
This would seem to imply to me, that the stock ecm doesn't clip the voltage
by reverse biasing a diode, to contol it, but rather use a scheme, where
they deal with it.  Maybe clipping these signals has a adverse affect on the
injectors opening/closing..
  Jus curious, if this makes sense.
Grumpy




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