Need to lower desired IAC counts...
10-16-2004, 07:12 PM
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Need to lower desired IAC counts... How do you lower your desired IAC counts? I want all the numbers to match and the PCM to be happy, however most of the time I have maxed IAC counts on my scanner. I would like to put them where they should be. Which table will actually change my desired IAC counts? None of the changes I have made appear to do anything.
10-17-2004, 05:30 PM
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One way you could do it is:
There is a hex socket under the throttle stop and under the boss that is on the TB
Turn that to adjust the stop until you get your desired IAC
Once you do that you will need to adjust your idle, to do this:
First unplug your TPS.
Then turn the ignition to the on position don't start it wait a min. or two.
Then plug it back in your done.( this method was outlined here before but I can't remember who wrote it)
Or you could drill the hole in the blade to a larger size but once you do this there is no going back.
There is a hex socket under the throttle stop and under the boss that is on the TB
Turn that to adjust the stop until you get your desired IAC
Once you do that you will need to adjust your idle, to do this:
First unplug your TPS.
Then turn the ignition to the on position don't start it wait a min. or two.
Then plug it back in your done.( this method was outlined here before but I can't remember who wrote it)
Or you could drill the hole in the blade to a larger size but once you do this there is no going back.
he wrote it LMAO 
10-17-2004, 11:15 PM
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I didn't think he was being smart-a about it. It looked to me like he was trying to help you out and seeing that he has 137 posts I doubt he realizes you're the one that posted the set screw trick. For that you call him a smart-a. Now that's weak.
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10-18-2004, 04:13 PM
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I think if you want to achieve the same idle airflow
with fewer IAC counts, you have to up the non-IAC
air available - drill or crack it with the set screw.
Are you trying to just center the counts for the airflow
you're at, or are you trying to knock down the real
airflow?
with fewer IAC counts, you have to up the non-IAC
air available - drill or crack it with the set screw.
Are you trying to just center the counts for the airflow
you're at, or are you trying to knock down the real
airflow?
10-18-2004, 06:19 PM
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Originally Posted by jimmyblue
I think if you want to achieve the same idle airflow
with fewer IAC counts, you have to up the non-IAC
air available - drill or crack it with the set screw.
Are you trying to just center the counts for the airflow
you're at, or are you trying to knock down the real
airflow?
with fewer IAC counts, you have to up the non-IAC
air available - drill or crack it with the set screw.
Are you trying to just center the counts for the airflow
you're at, or are you trying to knock down the real
airflow?
10-18-2004, 10:17 PM
#14
I would guess changing the idle airflow tables to a lower number would lower your desired counts. But then your desired airflow wouldn't match your actual airflow. I'm guessing there's still a hidden conversion table that changes airflow to counts like was mentioned in gameover's thread. So until we have access to that table you'll probably have to chose whether you want your airflow numbers or your counts to match.
10-18-2004, 10:17 PM
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Originally Posted by P Mack
I would guess changing the idle airflow tables to a lower number would lower your desired counts. But then your desired airflow wouldn't match your actual airflow. I'm guessing there's still a hidden conversion table that changes airflow to counts like was mentioned in gameover's thread. So until we have access to that table you'll probably have to chose whether you want your airflow numbers or your counts to match.
10-19-2004, 08:16 AM
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From reading the idle part 1 thread it seems to me that
the "Desired" value is an intermediate, the starting point
against which final trimming is done to get the "right
answer" for the idle closed loop.
According to that writeup at stopped idle the prime goal
is idle RPM and there are layers of airflow calculation,
followed by the closed loop feedback to hit RPM. Moving
idle uses the idle airflow as the target. Or something like
that. I suspect that this Desired Airflow is just not made
accessible (I saw nothing in the menus except RPM, airflow,
and temp compensation tables.
But as long as you can hit the RPM and running airflow
values you want, and stay stable about them, I guess
I'm missing the attraction here. Especially since your
actual counts were right about dead-nuts centered?
the "Desired" value is an intermediate, the starting point
against which final trimming is done to get the "right
answer" for the idle closed loop.
According to that writeup at stopped idle the prime goal
is idle RPM and there are layers of airflow calculation,
followed by the closed loop feedback to hit RPM. Moving
idle uses the idle airflow as the target. Or something like
that. I suspect that this Desired Airflow is just not made
accessible (I saw nothing in the menus except RPM, airflow,
and temp compensation tables.
But as long as you can hit the RPM and running airflow
values you want, and stay stable about them, I guess
I'm missing the attraction here. Especially since your
actual counts were right about dead-nuts centered?
10-19-2004, 06:03 PM
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Originally Posted by jimmyblue
I guess
I'm missing the attraction here. Especially since your
actual counts were right about dead-nuts centered?
I'm missing the attraction here. Especially since your
actual counts were right about dead-nuts centered?