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View Full Version : lower temps = more idle problems


spy2520
February 16th, 2015, 10:11 AM
I thought I had my idle set pretty decent but lately with these low temperatures I've been having problems. I can repeatably stall the car by turning the rear defroster on. And steering input at low speeds seems to have a negative effect as well.

Is this just not enough air for the change in load? If so where should I add air? I've been leaning towards the engine speed compensation table.

This is an A4 camaro with a VRX5 cam.
joecar
February 17th, 2015, 05:01 AM
In defrost mode, the A/C is running... maybe also look at the A/C columns in Desired Airflow Correction table B4515.
spy2520
February 19th, 2015, 05:56 AM
Yes, i have much to address. I have not touched any of the AC tables since tuning as it hasn't been warm enough to use it.

But one thing, it would stall when hitting rear defrost button even when the HVAC controls were off. Also, when releasing the parking brake after first turning the car on when its dark. Seems to be related to the load the alternator creates.
joecar
February 19th, 2015, 05:35 PM
At idle what is the ignition advance (pid GM.SPARKADV)...?
spy2520
February 20th, 2015, 02:56 AM
At idle its averaging around 26* which is what i have in the base spark tables. sometimes it may be +/- half a degree or so.
joecar
February 20th, 2015, 04:41 AM
Post log/tune files.
spy2520
February 20th, 2015, 02:01 PM
attached are my latest tune along with a short log of the car idling in park, and then I press the rear defrost button and it stalls out. Hopefully I logged enough stuff to make sense of it.

Ambient temperature is about 11*F in that log. You may be able to tell by the long ridiculous title of the tune that I've been through several iterations.

edit: throttle body and MAF are 102mm