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I don't know much about oscilloscopes but I found this analysis to be very interesting utilizing starter current draw to isolate a mechanical problem:

The article begins on page 2, its a 1994 Cadillac (notice the exhaust valve!):


Their archives have some interesting articles including many on Cadillacs, GM injectors, cleaning, fuel trim, etc, great reading:


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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