Since I've recently done this 727 ecm swap from a MAF originally, Car ran good, Though I had an aldl issue. Ended up being that I was running around in 'backup mode'. But the car ran just as strong as it did with my tuned maf setup. Now that I finally got a new ecm that fixed my backup mode issue, I started with a copy of super aujp v3. The car ran like crap. I get stumbles like when a fuel filter is clogged. So I tried just the stock hypertech chip I had, The car wouldnt even run for more then 5 seconds at a time. I modified the super aujp v3 bin for more fuel, less fuel, Ive ran stock timing tables. All runs the same, Like crap. Am I missing something here in the speed density tuning? I had my maf tuning down pretty good.

 

Are you starting with the most basic things, like Cylinder displacement and Injector flow rate?

 

Yes, I have corrected the super aujp v3 for my cylinder displacement, And fuel injector rate, As well as base timing of 17 degrees.

 

Double check your fuel pressure to be sure the inj constant is figured right.
Adjust the o2 constants for idle a bit lower (like 50 mV) and the idle should improve.
Might need a new o2 sensor if you were running in limp mode. Could be all gobered up with soot and not helping things.
Are you rich or lean for the most part?
A couple around the block runs with DM and VEmaster will help get the bottom end running closer to 128's. Beats guessing when just roughing it in.

 

S_AUJP_v3 in a 727 ECM? I thought the 730 and 727 were pinned out differently? Not sure, never used a 727 ECM.

 

The harness connector pins are labelled different (4 connectors instead of 3) but the ECM's circuit board is essentially a 730 - except for the obvious connector difference.

 

which particular o2 constants should I adjust, I find four constants to play with and one table.
=Constants=
"Idle o2 rich/lean slow zero error lower"
"Idle o2 rich/lean slow zero error upper"
"Idle o2 rich/lean threshold fast"
"Idle o2 rich/lean threshold fast hysteresis"

=Table=
"o2 rich/lean upper zero reference error slow vs. map"

I am not quite sure which ones to adjust lower.

 

Take a look here for some direction on the changes and reaction to expect.
Go slow with the adjustments, they don't help things once you go too far.
https://www.thirdgen.org/forums/diy-...%2Fl+threshold

 

17* base timing? Do you mind if I ask why you're running that much base?

 

Cuz thats how it idles best, And people on these boards suggested around that much because of the cam.

 

Do you mean base, or idle? Base is what the distributor is set to, and should be adjusted for best cold and hot starting. Idle timing is the timing in the spark table, and should be adjusted a few degrees less than minimum MAP timing.