Pro Mouse

iTrader: (15)

What can cause this?The car starts fine when cold not surging ,But as soon as I drop it into reverse or D it stalls immediately.Is this an IAC issue?It's only when cold sitting overnight.Hot start is fine...Thanks for your help....

Pro Mouse

iTrader: (15)

Anyone have Knowledge of this Problem?Surely I cant be the only Stroker thats had this problem

mrr23

iTrader: (3)

bump up the base running airflow 2 grams/sec and see what happens.

ringram

+1
Yes in the Drive cells. Your Park/Neutral is probably ok, just add some more air into the drive area as above.

Pro Mouse

iTrader: (15)

Could it be possible that my tuner Has to much IAC in it to cause this problem?Because he has got my Idle airflow alot higher than my cam and heads 346 was.But in the hot area's he has got less and in the cold area's he has got them alot higher....Thanks

P Mack

iTrader: (6)

No, your problem is not too much airflow in drive. You need more airflow in drive. It might be possible that too high of an airflow value in park would cause the STIT to be way negative, then you shift into drive and the negative STIT work against you. But on autos I don't know if STIT's reset to 0 when you shift from park to drive. Regardless, you just need to get your idle trims to 0 in park and drive, cold and hot.

Pro Mouse

iTrader: (15)

P Mack ,My Tune on my 408 is an open loop tune.MY LT's and ST's are allways at 0%.So you Think I need to go Higher with base Airflow then?

mrr23

iTrader: (3)

what are the IAC counts in park?

Pro Mouse

iTrader: (15)

Not really sure how to check that

mrr23

iTrader: (3)

a scanner like autoxray, or if you have tuning software. without being able to see what's going on, you are shooting in the dark as to what the problem is that's causing it.

Pro Mouse

iTrader: (15)

I Have HPT.What do I need to check?Do I check Desired Counts or actual Counts?

mrr23

iTrader: (3)

actual counts called IAC Position. if you don't have it set up in the config file under the table display, you'll have to do it.

Pro Mouse

iTrader: (15)

Ok I will check that in the table display.What should I see for numbers,Where do I want it to be?Thanks

mrr23

iTrader: (3)

mine typically are in the 50-70 range in park

Pro Mouse

iTrader: (15)

Ok Thanks I will check it when I start it in the morning and I will check it hot as well...

P Mack

iTrader: (6)

I think you are talking about fuel trims. I am talking about short and long term idle trims, which measure how much your computer is adjusting the airflow to keep your car idleing. If your Idle airflow table has 10g/s of airflow and your car really needs 12 g/s to idle at 900rpm (or whatever you have set), the car will sense the idle is too low and adjust the STIT to +2 g/s over time. The IAC will open based on the positive STIT and your idle will increase with the new airflow. Your car is constantly changing STIT to keep the rpms exactly at idle rpm, and the ltit learns over time based on long term trends.

When your car is not moving, your IAC opens to a position based on the idle airflow+short term idle trims + long term idle trims. By logging idle trims you can see how much you need to adjust your idle airflow tables.

If you actually were talking about idle trims, sorry for the long explanation. But your idle trims will not always be zero, if that is the case, something is not letting your trims learn.

Pro Mouse

iTrader: (15)

P Mack you are correct thats what I thought you were saying.In my tune where is STIT and Where is it in my scanner what would it be called thanks...

Pro Mouse

iTrader: (15)

Ok My IAC Position at 95 ect my number is 175 and 185 ect it fluctuates from 50-80....

P Mack

iTrader: (6)

On the scanner, open up the table display, right click and press insert>engine>idle> Idle Adapt (STIT). There's also LTIT for in gear and in park.

Pro Mouse

iTrader: (15)

Got it P Mack.So I want to see what this number is doing?So this would explain why I have a difference in Idle about 50-100 rpm then....Thanks