Hello,

I've just signed up to this forum as I'm looking for a pinout diagram for the ECU 'AC DELCO - #88999186' GM part # 16163993.
A bit of backstory would be that I've just purchased a Buick Indy Lights V6 and with the motor I was given an engine harness and this ECU. My auto electrician needs to know which pin is the battery live feed.
I'm feeling that I've exhausted google at the moment so any help would be greatly appreciated.

I think the ECU is from the C4 Corvette (correct me if I'm wrong)

That is a 1993 ZR1 ECU, you may be able to search the net for the pin out info or purchase a factory service manual which will have the pin out info.

B11 is typical 16163993 Battery feed. There should be many ECU pin-out references for confirmation scattered about the WWW

** Mentioned later in the thread 'Indy Lights' Buick V6 is quite a piece. It might be interesting to 'SHOW US YOURS'!!

If a 90-91 ecu small block version of the ecu, 1227730 ecu would be easier for him, I will trade you straight across. I have a good 1990 L98 sbc ecm and I am looking for a ZR1 specific ecm.

I doubt that would be of any value to the OP. The V6 Buick uses individual 'coil-packs' so I'd think the ECU used is intentional.

ive been wondering why the lt5 had its own. that makes sense! thnx wvzr1

OP, i looked up the indy buick, VERY COOL!

Thanks for the response guys. I'll have to keep looking.
But here's some images of the engine and the car.

Keep looking for what? You're implying that B11 is incorrect?

Looking for more information, I know you said B11 is referenced as Battery Feed. I will have to investigate this when I get back home from work, do you have any full schematics which I can reference a known sensor in my harness to the GM pin outs on this ECU?

*Definitely not implying that B11 is incorrect! I'm just getting all information I can, if I get this feed wrong and burn it out then it'll be difficult to get another ECU.

I could supply you with the LT5 ZR-1 schematics. I answered only your question 'intentionally'! It's the only question you asked! I'd think the shop could maybe 'snapshot' the PROM. In my info left column there's an email link. Send me yours and I'll send you the typical 16163993 ECU pin-outs. Your shop guy could maybe then compare pins that are populated in yours for comparison. There are shops that actually still do electronics for this V6 configuration.

Here's FSM 'images' that I'd say are 'typical' for that ECU

I really appreciate that! Thank you!