WS6FirebirdTA00

iTrader: (33)

i start my car and the rpms go up to ~1350 then way way low to about 400 and then over shoots again to 1100 and then goes to 900 and then back out even at 1000.

i also see that the dynamic airflow fluctuates a lot too with the iac count staying the same. i dont know what i can do here or what i can adjust really. any ideas?

also i cant find out the max iac position, what is the max number of iac counts?

WS6FirebirdTA00

iTrader: (33)

also, can i adjust idle spark,i see it goes down to 1.5* at peak rpm and at about 22* at lowest dip in rpm and once it evens out its only at about 12*, is this normal or no?

wrencher

iTrader: (2)

Sure sounds like a mechanical issue & not a tuning issue?
Sounds like a vacuum leak to me, if IAC is not reacting.

2xLS1

iTrader: (25)

Your adaptive idle spark control - overspeed/underspeed is probably causing the timing instability and may even be agrivating the condition.

WS6FirebirdTA00

iTrader: (33)

there is nothign wrong, this happens for about 10 sec when you start the car cold then its fine. the iac motor is at 310 right now and i dont know if i can set it higher. the tb is ported and epoxy fillled with copper tube so its letting less air in, but i have read of oters with this problem and stock tb. once the car warms up just a little bit its alright.

WS6FirebirdTA00

iTrader: (33)

yeah i was thinking of this, ill give it a shot and see what it does. do you have any ideas on a good starting point? and do you know if there is a way to adjust cold temp timing

99whitews6

iTrader: (2)

I have the exact same problem so keep us posted. I have tried messing with the RAF table although I havent had any luck. This problem came about when I plugged the MAF back in after SD tuning(not sure why this happened since it is in open loop at cold start).

This was not a problem on cold start ups when I was still in SD mode. Why would this start after pluggin in the MAF?

Black02SS

iTrader: (36)

What are your IAC counts at a warm idle?

WS6FirebirdTA00

iTrader: (33)

hot idle the iac counts are about 30, once the temp is about 160*+ at about 130* the iac counts are right at about 65-55. ive opened the TB blade more but if i go any more then im gonna be left with 0 iac counts on hot idle

sevanseriesta

iTrader: (34)

My Iac accounts do not go to 0 ever is there something wrong with my car.....Do you also think that may be the reason why it is not idleing right.

WS6FirebirdTA00

iTrader: (33)

it shoudlnt go to zero at all, min should be about 30

Black02SS

iTrader: (36)

Yes, you need them to be around 30-60.

Larry

iTrader: (4)

What values would you recommend starting with?

WS6FirebirdTA00

iTrader: (33)

i would like to knw this as well, dotn want to change it too mcuh

2xLS1

iTrader: (25)

Zero out the table to see if that is what is causing the problem.

WS6FirebirdTA00

iTrader: (33)

underspeed is already zeroed out, ill zero out the overspeed and check out how that is.

Larry

iTrader: (4)

No luck. Probably cycles more.