[QuasiMondo]

I redid the sensor wiring today. Took her out on a run....and got the same results(!) So I went back, double checked the wiring, and verified voltages. All were good. So I figured that I have the sensor tapped into the wrong vacum port, and even pulled the hose off to see if it would read any different, no change.

Then it hit me like a light bulb. I remembered that when I first upgraded the MMCD software, I saw two MAP readouts, one matched what I would expect, and the other didn't move. I selected the one that didn't move, and it worked.

Sweet success of mine!!!!!!

Then I got to thinking about why it didn't work before, and I remembered what Clint said about what the EGRT would read when nothing is connected to it. Turns out that when I had the MAP sensor wired in backwards, the EGRT saw nothing because pins 4, 5, and 6 were open. No different than if I had nothing there.

So what about the 'other' MAP reading? I got the sensor working right, I did a few runs, graphing both readings side-by-side. I discovered that the 'bad' MAP reading would peak right around 10 psi on the 'good' MAP reading. I also noticed that the factory boost gauge would hit its peak around the time the mechanical gauge reached 10 psi. This leads me to believe that the 'bad' MAP reading is actually what the factory boost gauge reads.

So to sum it all up, the wiring colors for DSM's is correct. If you're using MMCD, make sure that you're selecting the first MAP reading (the one after TPS) and not the second one (listed with the eight new inputs)

Many thanks for the help on this, Clint. With your permission, I'm going to put your FAQ on dsmtalk.com, they've been asking about it. I'm also going to see if any GVR4 people have done this as well so they can tell us what wiring colors they use, I'm sure it's going to be different as well.