IAC steps.

[TAQuickness]

Yes definately IAC steps not IAT.
Sorry.As someone said b4 Brain fart.

Ill make sure the TB blade is closed fully, as the set screw can be adjusted further down.
Reset the TPS switch and then log to see IAC steps.

If its still low how do I increase the steps to something close to 30ish. Do I increase B4307?

From an ealier post:

I'm assuming you ment IAC (Idle Air Control) instead of IAT (Intake Air Temperature).

In the case of IAC (on cable actuated TB's), the goal is really to give the valve enough room to control idle. IMO, 30 steps is a bit on the low side. Stock the IAC count is about 60 steps at hot idle.

An IAC count of 0 steps means the IAC valve is closed. A count of 310 steps is 100% open. In your case, 7 steps, the valve is almost closed, indicating too much air is getting past your TB at idle. To correct this, you will need to adjust the set screw to allow the TB blade to close more. If the set screw will not fix it's because the TB blade hole is too large, you may need to replace the blade and drill a smaller hole.

But, definately try the set screw first and go from there.

[Big Kahuna]

From an ealier post:



But, definately try the set screw first and go from there.

Ok after much screwing (pun intended) around with the throttle stop screw and some alterations to make the T/B blade hole smaller. I am still seeing the IAC steps around the 19-24 mark. As soon as the cooling fans kick in the steps go to 34ish, so Im making some progress.

Ive noticed that with my T/B screw adjusted fully closed, the steps decrease, if I open it slightly (1 turn) the steps increase which suggests to me that either the balde is past 45 degrees when fully closed and starting to open again, or the blade itself isnt of the best machine work.

I've gone from T/B blade hole size of 4.5mm down to 3mm. I'm going to close it fully this morning and do some more testing. Ive notice if I place my finger over the hole to close it off, my IAC steps are in the mid 30's.


What do I make of all this????????????????????????

[ringram]

You have a weird throttle body
But it sounds like you are on the right path

[Big Kahuna]

You have a weird throttle body
But it sounds like you are on the right path

Given the T/B is from STARR Performance, anyhting is possible. The king of rip off.
Ive had it for many years so I will persist with closing the hole up and if that sucks, then Ill refit my stock t/b and start all over again.

But to answer one of my question still unanswered. To increase the iat steps, do you increase the desired airflow table?

[Doc]

Sounds like you have answered your own question...The hole is letting in too much air. By the way, how are you "making" these holes smaller? My untouched 80mm BBK has no hole, my stock 75mm Fbody had a little hole. With full control of the IAC valve via the cal I don't think there is a real need for a hole for most applications.

[Big Kahuna]

Sounds like you have answered your own question...The hole is letting in too much air. By the way, how are you "making" these holes smaller? My untouched 80mm BBK has no hole, my stock 75mm Fbody had a little hole. With full control of the IAC valve via the cal I don't think there is a real need for a hole for most applications.

Thats intersting Doc. I didnt know the BBK's had no hole.

No hole it is then.

[Big Kahuna]

Well as my predictions and logging suggested. After filling the hole, the car idles magically at 850 with iac counts of 30-35.

Bout time.

[Rhino79]

Did you weld it up or what??

[eboggs_jkvl]

Did you weld it up or what??

I think it was chewing gum?

Man, welcome to the club. I've twisted that damn set screw so much I have carpal tunnel! IAC is hell to get right.

[Big Kahuna]

Did you weld it up or what??

Bronzed close.