I was Art's place in Ontario, Ca. today and he gave me some pointers and helped me get this MAP adjuster installed. Thanks again, Art!
We found the stock voltage reading on the map sensor was 4.63V . This falls in to the range the Turbo City directions suggested that most stock Jeep map sensors would read at, which was 4.60-4.85V
With the stock voltage obtained, you then plug the Adjustable Map between the stock Map connector and the Map Sensor itself (this is just for YJ 2.5s; TJs need you to do a bit more wiring and the Turbo City kit includes what's needed).
Then there's a long white wire on the Adjustable Map that you need to run to the side to connect to a +12V Key On Wire.
I started looking around the engine bay for the PCM and we identified it as behind the coolant and windshield washer fluid containers.
These containers looked like they were going to have to be removed to get to the PCM. So we looked around to see what else was available.
We ended up finding a 12V source on a exposed electrical connection very close to the PCM -- turned the ignition to on, did a voltage check on one of the end connections on the connector and found it reading 12V on and 0 switched off. The connector wire we ended up connecting the adjuster's 12V wire to happened to be white with a yellow stripe (wire color I would have been looking for if we had used 9 on the PCM)
So we went ahead and connected the white wire from the adjuster to that using the multi-lock connector included with the adjuster.
Once you get everything connected, the Turbo City directions advise you to turn the little plastic screw on the adjuster so that it is .2V higher than your original reading -- in this case, this would be 4.83V
So with the multimeter still connected, I turned the screw on the adjuster and took it up from 4.63V to roughly 4.83V according to the multimeter. (This adjuster is a little tough to dial in precisely in .01V increments -- the multimeter showed 4.82V after a lot of trial and error, so I just left it at 4.82V for the time being)
I then drove it around and on the highway for about 20 minutes and came back. It drove better all around just with this little .2V adjustment.
Obviously, I'll certainly experiment with settings higher than just 4.82V and see how it then drives on the city/highway. And I can always pull the adjuster or probably even just set it to the stock map reading -- 4.63V -- for emissions tests.
Do think it would be decent to have 02 Sensor-based readout for A/F so you could adjust raise the voltage to achieve a specific AF ratio with your current setup or even with additional modifications. So I might see what's out there along those lines.
I'll take a few photos of the adjuster in place and where we wired it to.
