Hi:

Electromagnets, like I think are in the injectors, have both resistance and=
 inductance.
For proper function I expect they use high voltage drive with series resist=
ance in the circuit added to shorten the L/R=20
time constant.
So testing the inductance of the injector might be a good idea.

Now for the shameless plug.  It may be that an injector has a short between=
 turns, as happens in flyback coils for CRTs.
The effect is to make the coil worthless but it is very hard to detect with=
 resistance or inductance measurements,=20
what's needed is a Q measurement.
The FlyBack Tester I sell hits a coil with a pulse and counts how many time=
s it rings.
http://www.prc68.com/I/ESRmicro.shtml#FBTest

If you have a bad injector it would be interesting to compare it's FlyBack =
ring test result with a good injector.

While you're using a 4-chan scope, I would expect you have a trigger signal=
 once every other revolution of the crank)=20
for triggering.

Mail_Attachment --
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
piclist-request@mit.edu wrote:
> RE: [EE] Injector Testing

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