jeepguy553

What all is used to calculate the total SA in the $61 code? I have found 4 basic things that look like SA sort of stuff:
1.) Main SA vs RPM and MAP
2.) Main SA bias
3.) Coolant Compensation SA table
4.) Coolant SA bias
Looking at the Main SA table, it appears that at certain points, it would be possible to get a negative SA (or spark retard). Is this correct or is there something else in the code that I am missing?

Grumpy

All the masks I've looked at have a max, and min timing possible.

You also might have PE spark, EGR spark, knock retard, initail start, maybe highway cruise. Gotta read the hac, and actually read the code to see if the code actualy runs the routines, or use an ecm bench, to see if you calculated data matches commanded.

jeepguy553

I was looking at the hac and found a little more. The problem I am having is that I have the BLMs and INT's at 128 across the board from 400 to 1200 rpm. The engine is still running rough and has to be held at about 1100 rpm for a couple of minutes at initial startup...making me think that it is somehow timing-related. I haven't messed with any open loop fueling yet, but that it definitely next on the board. Closed loop stuff is right where it needs to be as of now. Upper rpm stuff is still a little lean even in closed loop without PE or AE being set. I have been working with the low and mid timing stuff with the emulator and it seems to be getting better by ear. I am about to go outside and run the latest BIN to see where that has put it in terms of knock counts and BLMs. Once it is warm (over 170F) the idle is really smooth and has a nice bump to it that could be a little intimidating to lesser vehicles/drivers at a light. It's just that little pop I can't get out of it with the fueling...it HAS to be SA. The engine is all but new with good compression on all 8 cylinders and a great ignition system.

Grumpy

Without looking at your code, generally,

you have a crank AFR.
Then a choke AFR.
Then a time till choke starts to decay setting.
Then a how fast to decay out choke, after the above timer, setting.

YMMV

jeepguy553

Found it. I got a great tune going now. Not all 128's across the board, but it is getting there. I looked in the hac and found all the stuff you were talking about, Grumpy. Sure enough, it was there in the ECU, I was just too stupid to read it. Idle stuff is in great shape. 128-129 at 800 rpm from 40 to 60 MAP. O2 volts are a little wacky, though. At 800 rpm x 50 MAP, they will sit there and climb, but the BLM won't budge from 128...INT sits at 128.8. In the cells around 800 x 50, (40 and 60 MAP) they will sit on about 0.460 while the 800 x 50 reading will climb up to about .780. Am I missing something here? Is this what is referred to as O2 crosscounts?
Oh yeah...a bit OT here...my battery volts read 11.8 in WinALDL. That alarmed me, so I put a DVM on the battery and it read 12.89 VDC and climbing right after startup. I think I caught that in the datalog too...and I may have managed to catch an intake pop as well. I'll have to look to be sure. I did some stuff with the SA and bumped the mix up in that cell (400rpm x 50 MAP) and it hasn't happened again since.
Thanks, Bruce!
EDIT: I know what's coming next..."Get a WBO2." As soon as I can afford it, I will definitely get one. I have a few other priorities right now like getting my tuition paid for this summer, getting my Jeep registered so I can legally drive it on the roads, and getting a top to go with it because my old one is junked. I just hooked the A/C compressor up in it for the 200 mile highway drives I will be doing this summer for my thesis project.