Idle/decel surging problem

[BlownAlaskan]

Hey Guys,
I was working my VE/autotune the other night and everything was cool until my third flash of the evening:

The truck is surges really bad at idle now. The timing oscillates, and so does the afr. It seems to drive ok, but when I slow down to stop it dies. It also dies switching from Park to Drive or Reverse.

What could I have messed up? Is there something mechanical that could be wrong? I hate to start changing stuff in the tune when all was doing was working on the VE table.

Running SD Cust OS 3. Fuel pressure good and no logged misfires.

[Dirk Diggler]

Check the RAFIG pid and see how much air the car wants to add or subtract. This pids goes right back to your desired airflow table and esp check this if you are drive by wire

[BlownAlaskan]

Can't seem to find that one. Is it a custom PID?

[Dirk Diggler]

Do you have the latest version if not you have to make a calc pid

*CLC-00-945
gps -32.0 32.0 .2 "{GM.IAC_LTD_DMA.gps}+{GM.IAC_STD_DMA.gps}"
lbpm -5.0 5.0 .2 "{GM.IAC_LTD_DMA.lbpm}+{GM.IAC_STD_DMA.lbpm}"



CALC.RAFIG F53D CLC-00-945 "gps,lbpm" Idle "Idle Airflow Correction AC Off, In Gear"

[BlownAlaskan]

Ok I put that in the slot definations section, what do I put in the Parameter Reference Numbers section below it? Sorry, I'm slow.

[Dirk Diggler]

That goes there but if you have the latest version it should allready be included and if you are adding it you will get an error. If you dont have the latest and greatest then you need to add it.

CALC.RAFIG F53D CLC-00-945 "gps,lbpm" Idle "Idle Airflow Correction AC Off, In Gear

[BlownAlaskan]

Ok, I got her in there... Now Iam going to go and log it. What am I looking for? Is there a good write up on how to pursue this?

[joecar]

It's already in the latest version which is downloadable from the website.

[BlownAlaskan]

yea, I downloaded the latest version tonight. What is the procedure for using the new idle pids to correct the idle? I have already constructed the maps, so is it just a matter of logging and then pasting the data into the tables in the tune? What is the procedure?

Thanks for the help.

[Dirk Diggler]

Make the maps log the startup with the pids and paste them to the desired airflow table, startup tables and startup friction tables repsective of course