EvoJoeIX

iTrader: (16)

When i use my a/c, my car idle drops and likes to go bsck and forth between about 800 and 500 rpms. It seems like its gonna stall but never will. It will also drop to about 500rpms if i push the clutch in when driving. Sometimes when i do this, it will stall. I dont have a big cam (gsc s1) so its not a vaccum issue or anything

Anyone know what tables i need to change in my ecu to solve this problem? Im running tephra speed density

killerpenguin21

iTrader: (20)

havent loked in a while, but the tables are something like target idle and a/c target idle. make sure your in highest user setting.

EvoJoeIX

iTrader: (16)

I seen those tables and the idle in the tables is like 1200.... The car definately doesnt idle at 1200 when the a/c is on

killerpenguin21

iTrader: (20)

sounds like you have a mechanical issue then

Chef-j

iTrader: (16)

Is your battery in stock location?

sujinX

iTrader: (22)

i just went thru this long process so i can help you. i have gsc s2 cams and it stalled almost every time with a/c on

download ur file from your ecu and open it in ecu flash. change the user level to developer.
scroll all the way down to the bottom and click the "Desired Idle rpm with AC on"
and change the value to like 1140 or whatever for all 4 cells. this worked for me and has been. but again each car is different, some said 900 works but it didnt on mine, so i slowly bumped it up. it takes a lil bit for the ecu to learn it so upload and sit there and idle with the ac on for a few mins so it can learn then drive around with ac on around the neighborhoods. dont blip the throttle when its about to die, just let the ecu save it and figure it out and it will.

EvoJoeIX

iTrader: (16)

Its definately not a mechanical issue...

And no my battery is in my trunk. What would this have to do with anything

Chef-j

iTrader: (16)

My car does same expect its fine when its sitting. My tuner bump idle up but didnt work. My battery is in trunk, he is guessing voltage issue with mine. That is why i asked.

EvoJoeIX

iTrader: (16)

Intresting.... I would think it would affect other things also if it was voltage. Not just the a/c idle

240Z TwinTurbo

iTrader: (25)

Look at these two tables...

Desired ISCV initial Step position with AC off-drive
Desired ISCV initial Step position with AC on-Neutral

You will see the steps with the 'AC-on' are higher. Essentially, when you kick on the AC the engine is under more load so it opens up the IAC to add more air to compensate.

Chef-j

iTrader: (16)

Op, if you fix this issue please update for us. I like to give a try.

EvoJoeIX

iTrader: (16)

Ill look at my maps tomorrow and mess with some stuff. Ill let you guys know if i get anywhere

rcheung

iTrader: (15)

Were either of the battery terminals recently unhooked?

EvoJoeIX

iTrader: (16)

No

nytalonTSi

iTrader: (18)

I had this issue with a/c and heat before replacing the throttle body seals.

Try adjusting your BISS to the point where you log 20-25 idle steps in evoscan. This helped my idle drop with a/c on.