Cold idle/drive stumbles, warm is mostly

[tenpaiyomi]

01 LS1, LS6 Intake, 224R Cam, Long tubes

I went through the standard Calc.VET tuning for my driving and, outside of an occasional stall when coming to a stop here and there, it drives great. My problem is the cold idle/drive, I'm not sure where to go on getting that tuned to where I don't have to sit in my car for 5-10 minutes just idling (sometimes having to hold the gas a bit) to keep it from dying, or try and shift under ~1.5k rpms to prevent it from stumbling. Any potential insight would be great.

[LastCall]

A tune and log would help. You may need to add some air to your desired airflow and perform a rafig/rafpn. Once you do that, take a look at the throttle follower values.

[joecar]

+1 what LastCall said.

[tenpaiyomi]

Yep, I'll get the tune/log as soon as possible. What sort of log are you guys wanting, just a general startup until it's warm? Any particular PIDs you want me to monitor? I'm not familiar with rafig/rafpn, can you explain on that?

[LastCall]

The rafpn and rafig are calculated pids that measure the correction applied by short and long term idle trims. Right clicking on them will tell you the other pids required to make them work properly. You'll also need the map so you can apply the values to the desired airflow table. Other pids I would log are iac steps, rpm, dynclyair, timing, iat, and ect.

[tenpaiyomi]

The rafpn and rafig are calculated pids that measure the correction applied by short and long term idle trims. Right clicking on them will tell you the other pids required to make them work properly. You'll also need the map so you can apply the values to the desired airflow table. Other pids I would log are iac steps, rpm, dynclyair, timing, iat, and ect.

Thanks for the explanation on that. I've got RAFPN, RAFIG, MAP, IAC, RPM, DYNCLAIR, IAT and ECT. Only thing I'm a little unsure of is timing, not really sure which PID it is. My guess off hand is EST_RUN_DMA, but wanted to confirm before I do some logs.

[LastCall]

Should be timing advance for cylinder 1. Add in TPS, MAF airflow, and and long term fuel trims.

[tenpaiyomi]

Should be timing advance for cylinder 1. Add in TPS, MAF airflow, and and long term fuel trims.

Currently running an SD tune, so no MAF right now. I can add all the others though and get the log. If MAF is absolutely needed, I can swap back to non-SD and put the MAF back on.

[tenpaiyomi]

Log and tune. This is from cold to normal operating temperature when my fans turn on. Any help is greatly appreciated!

20021
20022

[joecar]

Thanks for the explanation on that. I've got RAFPN, RAFIG, MAP, IAC, RPM, DYNCLAIR, IAT and ECT. Only thing I'm a little unsure of is timing, not really sure which PID it is. My guess off hand is EST_RUN_DMA, but wanted to confirm before I do some logs.Timing pid is SAE.SPARKADV.

[joecar]

Maybe also log GM.DYNAIR (g/s).

[tenpaiyomi]

Maybe also log GM.DYNAIR (g/s).

I already have the SAE.SPARKADV in the log I provided. I'll do another log in the morning with the GM.DYNAIR and post it. Thanks for the recommendations.

[tenpaiyomi]

I went through the idle tuning tutorial and it seems to have helped some, but I can't really say for sure until the car cools down and I can do a cold start. I do have another issue, but I'm going to start a new thread for that.

[LastCall]

I went through the idle tuning tutorial and it seems to have helped some, but I can't really say for sure until the car cools down and I can do a cold start. I do have another issue, but I'm going to start a new thread for that.

I looked at your tune, your timing is only about 12-13 degrees when cold. I think it is due to the values in your timing ECT table (B5910). Has you pulling out -6 degrees where you idle at. Timing is also getting pulled from somewhere else. You can try bumping the timing up with the DVT controls to see if that helps. If it does, I would edit the table some or zero out the values in the start up temps.

Based on the RAFIG, you don't have enough air cold and too much air when warm. I would adjust that and see how it affects things.