1991 TBI Tuner Pro RT Data Analysis

[jim_in_dorris]

no, $42 also has 350 bins, I run it in my truck. If you are truly running $85, then you have a 7060 ecm which is for 4l80E transmissions. If you have a 7747 and are using the $85 adx and xdf, you data will be wrong. totally different masks. the ECM is behind the glovebox I think. you should be able to see the sticker without removing it. Since you are not tuning, just trying to see what is happening, I wouldn't remove it right now.

[WICruiser]

I finally got a chance to check my MAP sensor.

I forgot to capture the 0" vacuum reading but it seems pretty good everywhere I checked:
5" Hg - 3.82 volts
8" Hg - 3.27 volts
10" Hg - 2.92 volts
12" Hg - 2.55 volts
15" Hg - 2.00 volts
17" Hg - 1.67 volts
20" Hg - 1.12 volts

With the base timing reset the fuel economy seems better (roughly 11 or 12 MPG when towing vs. 8 prior).

I need to capture some data with the timing change to see what the knock sensor is doing but I do not hear any ping noise.

[WICruiser]

I finally got a chance to check and indeed I do have the 7747 ECM.

I am getting better at using the software to record data, now all I need to do is decide if it is telling me anything.

The base timing advance really did change the performance and I believe the fuel economy. I should really determine how to confirm where the timing is (the timing tab is rusty and hard to see so no real numbers are visible.

One thing that I thought was odd is the knock sensor is still only reading 1 or 2 events. I am not hearing any pinging but I expected more knock sensor activity with the timing change. It could be I am not really getting a knock sensor signal so I am not banking on the number meaning anything.