What year engine? The 95 uses a crank sensor on the front of the engine. Not sure about 92-94.
3800 ignition system is similar to 3.8 2nd gen. There is quite a bit here including waveforms (p. 4 or 5):
http://easyautodiagnostics.com/gm/3....-sensor-test-1
More waveforms:
https://www.youtube.com/watch?v=jACyNHl_L1g
Balancer images and some other goodies:
https://www.youtube.com/watch?v=G99ell1_99o
Some good stuff on the older 3.8 (ICM synched spark) on P. 5 & 6
http://www.askatech.com/askatechlive...track/g015.pdf
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