1228747 to 1227477 swap.

[EagleMark]

We did. Turbo 400 = 1227787. 700r4 = 1227747. Ha! You have any idea how many times I have used this diagram and never got down to bottom to see Turbo 400? I just happened to spot it today looking for wiring diagram for fasteddi soliniod, he was hooking it to ground and I swore it needed to be hooked to power as the ECM was ground...

I really don't think you need a one ton or turbo 400 specific bin, just have to figure out how to adjust TCC ground in XDF! But there are van 5.0 and 5.7L 3 speed bins in the ECM information thread. But I don't remeber anything in XDF for it, going to look now...

[EagleMark]

I'll take that back! I compared a 3 speed van bin to my ASDU 700r4 TCC bin and there are a lot of changes when you look at the XDF for TCC! One thing I noticed outside tranny controls is the Van 3 speed bin was set RPM for open loop idle, I didn't like that?

The $42 XDF was written for 700R4 and never took into consideration turbo 400. There is a bit for manual...

[1leg]

I have been driving the suburban all week, The off idle stumble is a pita. I have done a few tweeks to the VE to try and make some improvements but nothing has really helped. I switched to the to AHWZ bin for a 88 5.7 3speed application and it seemed to improve it a little. I have been looking thru the bins with compare and having a hard time find anything that is really different.

Where/what should i be adjusting for a off idle stumble? it's stumbles in drive or park, but in park its really bad. And i know it really rich at idle.
With the 8747 it idled really low but never stumbled.

[EagleMark]

That is usually an AE adjustment. But before I would do anything there I would know fuel pressure is 13PSI.

Also do a compare of your bin to ASDU and in tables there are four settings for Open Loop Closed Loop. Copy all them from ASDU to your bin and you will have closed loop idle like you did on your 8747! Might just go away...

[1leg]

That is usually an AE adjustment. But before I would do anything there I would know fuel pressure is 13PSI.

Also do a compare of your bin to ASDU and in tables there are four settings for Open Loop Closed Loop. Copy all them from ASDU to your bin and you will have closed loop idle like you did on your 8747! Might just go away...

I'll be doing all the system check this weekend. I also burned a chip with the changes you suggested. test it tomorrow.

[EagleMark]

And i know it really rich at idle.

Just caught this from above, then reading your last post. If it is really rich at idle which is open loop in that bin, then accelerate the RPM reach closed loop and there's going to be a drastic change! Possibly your stumble!

But now you will have closed loop idle, and if not to rich O2 will stay hot enough to give BLM readings to tune Idle VE cells!

[1leg]

using the AHWZ bin as a starting point did the IAC reset and updated the 4 open/closed loop setting to the same as the ASDU. Suburban runs much better still has a little stumble but i would say its about 90% better, at least its drive able. Still has BLMs in the 119-121 range at idle. IAC seems to go wacky sometime, goes really low when i go from park to drive. I wasn't able to duplicate the problem consistently to get a handle on what might be causing it

Still takes a long time to get in to closed loop so i checked the BLM history, still way rich at idle. making some changes to ve in the idle cells.
Questions
Going down in the VE cell = leaner RIGHT?
How much would you change if you had 119 BLM in a cell and the cell has 19.50 in it?(just want to see how much i can change in one step)
Would a heated O2 sensor be better? this truck has a custom exhaust system O2 sensor is in the stock location in the merge collector but moved about 6-12" away from the engine compared to were it was before, I also have shorty headers.
Would it be better to move the O2 into one of single down pipes?
Should the O2 stay consistent when at cruse speeds? My o2 voltage will drop suddenly from above 400 then go to 50 or 60 even with the steady 2500-2800 rpm.

Thanks everyone for the help. Its great to see the changes making improvements. finally heading in the right direction.

[gregs78cam]

I am sure someone more knowledgeable than I will chime in soon but these are my thoughts.

Questions
Going down in the VE cell = leaner RIGHT? Yes
How much would you change if you had 119 BLM in a cell and the cell has 19.50 in it?(just want to see how much i can change in one step) Calculated value should be 18.12, I would go with somewhere around 18.25 and sneak up on the right number
Would a heated O2 sensor be better? this truck has a custom exhaust system O2 sensor is in the stock location in the merge collector but moved about 6-12" away from the engine compared to were it was before, I also have shorty headers. Anytime you add headers always go with a heated O2, just my thinking though.
Would it be better to move the O2 into one of single down pipes? I think really only if you put a bung in both and then check the other bank after you think the tune is satisfactory
Should the O2 stay consistent when at cruse speeds? My o2 voltage will drop suddenly from above 400 then go to 50 or 60 even with the steady 2500-2800 rpm. As long as it is moving across stoich that is good. A reading of .050 could just be timing of the data point picking up the extreme peak of the swing, I like to watch the O2 cross counts and make sure they accumulate quickly.

Thanks everyone for the help. Its great to see the changes making improvements. finally heading in the right direction.

[1leg]

Thanks Greg.

That way exactly the same way i was thinking. just want to confirm that i wasn't doing something wrong. I might have to take it to the exhaust shop this week and have him add a couple of O2 bungs to my down pipes.

[EagleMark]

With headers and your non heated O2 sensor that far back at highway speed it sounds like it's cooling off going open loop. Run your data log in TP and look at Item list for O2 ready and closed loop when this is happening. Or post up your data log!