"Octane Adjust Switch" pinout on ECU?

[NoSlo]

Helms says that pin 29 (pink) on the ECU pinout is for 'octane adjust switch' (at least on the 3.2; there is no such pin on the 3.8 taurus ecu). From doing some googling, it seems like on other cars, there is a jumper like the SPOUT connector connected to this pin, and pulling it will retard the timing 3 degrees, adjusting for lower octane fuel. Apparently, dealers pull the plug if annoying customers complain about pinging.
There is no connector reference I could find that says if there actually is a switch or jumper wired up for this. I'm wondering if anyone has seen or played with this pin, if it is wired to a jumper, if there is a table or mapping in the ecu for when this pin is pulled or grounded, and if it actually might improve fuel economy or emissions when running lower octane...?

 

[Ishodu]

Take a look here
http://www.shoforum.com/showthread.php?t=56278

 

[NoSlo]

Thanks for the effort, but I'm not interested in the SPOUT connector; I know where both of those are.

 

[Ishodu]

With the car running correctly it will do this on its own if it senses a knock via knock sensor.

 

[NoSlo]

You can see from my post here:

http://www.shoforum.com/showpost.php?p=525622&postcount=12

I understand that concept too...

Just wondering if anyone (TwEECer types, etc) has some first-hand or anecdotal experience with this pin. It seems to be more prevalent and used in OBD-II cars, there is even a DTC set on OBDII if the ECU input on this pin is wonky. I also saw a post from a Mustang LPM programmer complaining that in one of their chips, superchips cleared the map table data the computer uses if this jumper is pulled. Since there is a map it possibly does more than simply retard timing.

Maybe I'll just trace the pin on my own car, and see if it is pinned and wired. A rotunda breakout box should allow grounding or disconnecting this pin a little more easily, and we can see what happens...

 

[projectSHO89]

The "Octane Adjust" bar is the SPOUT #2 plug on the SHO engine.

This plug is the one located adjacent to the ignion coil. Rermoval of the plug causes the engine controls to back off a bit to reduce spark knock. Since these engines are monitored by the KS, this plug receives little attention on these engines.

Steve

 

[Axianator]

Jay,

In my disassembly and study of the '89-'95 V6 SHO calibrations, I have found no evidence that the octane adjustment pin modifies fueling or any other behiavor - only spark advance. Furthermore, there are several octane-related tables (or "maps") that are utilized by the EEC on these vehicles; however, very few people actually possess access to said tables on the V6 SHO.