Help with vehicle staying running and cold starts without throttle aid...

[sac811]

Here is a log from today using your most recently updated tune for me, but with the A/c running:

LS1B_0656.efi

[statesman]

Okay, just a few changes here. Do a log with your A/C running with this new tune.

[sac811]

Here is the new log with A/c running:

LS1B_0657.efi

I'm not sure completely, but I dont think it liked the increased timing added around idle rpms. I had lowered those previously to what they were based on logs showing that the vehicle seemed to do better at those timing levels. But take a look at the log and see what you think. I'm definitely not as good with finding out what works right compared to you of course. Not sure if the VE changes helped or hurt, since the timing was also changed.

One more thing I noticed was that when running with the A/c off, it seemed to run worse than before with these changes. Again my guess is the timing, but I don't know how much the VE effected it either way though.

[statesman]

I can't feel or hear your engine so your feedback helps. I've gone back to the previous tune and made a couple of air adjustments. With this new tune, I'd like you to log a different set of PID's.

SAE.TP
SAE.MAF
SAE.MAP
SAE.RPM
SAE.ECT
SAE.VSS
GM.IAC
GM.IAC_TC_DMA
GM.IAC_TF_DMA
GM.IAC_LTDAC_DMA
GM.IAC_LTPNAC_DMA
GM.IAC_STDAC_DMA
GM.IAC_STPNAC_DMA

Do your log with the A/C on, but also let me know if driving with the A/C off has suffered at all with the throttle cracker change I made.

[sac811]

Here is my current tune:

CL_33WOTSpark_MAFail_ModAir3.ctz

In the tunes a bit early in thread I had the low octane spark tables 6 degrees less than the high, but forgot with MAF failed it defaulted to low. So copied those over to low and then did these logs with air on and new pids you have in last post:

LS1B_0664.efi
LS1B_0665.efi

[sac811]

Another couple logs with same tune as above:

LS1B_0666.efi
LS1B_0669.efi

[statesman]

Your air looks alright. I've made a few changes and unfortunately you'll need you to redo your RAFIG/RAFPN and your VE with this new tune. When you've done that, I'd like you to do a log with the pids you were logging before... the one with the long term and short term trims.

[sac811]

Here is latest tune used to get logs below:

OL2_33WOTSpark_Mod4.ctz

And here are drive and park logs with MAF readings after an hour or so of driving then being back home taking these logs at idle:

ParkMAF.efi
DriveMAF.efi

And if you have time, adjust the low octane timing table to the timing you said works the best for idle control.

Thank you

[statesman]

The low octane timing table isn't referenced during idle conditions.

Here's a new tune with a slightly lower base spark... Do a RAFIG/RAFPN with this new tune and then do a driving log in closed loop with the A/C on... logging with the old pid list, which has the short and long term fuel trims.

[joecar]

+1 what statesman said, HO/LO timing tables are not referenced during idle.