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I am sorry I missed all of this I have been distracted with a lot of stuff.

I am happy that she is running well and the ISC is working!  @OldCadTech knows his stuff.  :hatsoff:

This is a great thread on the ISC, its slowly becoming a thesis paper! 

 

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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It goes without saying that BodybyFisher and OldCadTech are the "stuff" of Caddyinfo. This forum relies on expertise !

 

Quick update: yesterday, after several drivings and about 130 miles, the onboard computer seems to have finally reached its digital equilibrium (automatic idle learn) and the idle is now at about 650/675 RPM (at operating temp in drive at standstill and in park) as per eyeballing the tach.

Freeway MPG was 18.9 (120 miles) during the immediate post-ISC replacement with slightly high idle.

With the idle settled down now I should be getting better MPG for future  freeway driving.

 

Thank you !!

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