Originally Posted by
axekick
I thought about hijacking the 99 XJ thread but I didn't want to be rude and I suspect the 99 and 97 XJs are a little different.
I got my MVPI2. I hooked it up last night, pulled the tune without any problems and made a short data log with it running. Here are a couple of things I noticed... My Fuel Trims seem stuck. Even on my way to work the LTFT and STFT were the same all the way to work. They were something like -3 for STFT and 1.5 for LTFT. If they aren't moving, I'll have to do any fuel tuning with my wideband or based on the narrowband voltage but I'd rather get it trimming like it should. It was commanding Closed Loop, BTW.
Also, There was no PID for MAP that was working. There's a "Manifold vacuum" PID but it stayed at 60kpa even though the MAP Voltage seemed to be reading correctly. I'll have to make a custom PID to log MAP based on voltage. I can't understand the numbers in the tune for the MAP sensor curve. Maybe someone can help with that.
Lastly, my engine coolant temperature was stuck at 90 degrees F the whole time. I suspect my sensor is bad. I unplugged it to see if it would change and it did. It went to -40 deg and threw a CEL. Then when I plugged it back in it stayed stuck at -40. I'll try to get a sensor today and see if that fixes that.
I haven't started making changes in the tune yet. I need to be able to monitor some of these parameters before I'll feel comfortable making changes.
I'll post my log file later today.