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  #1  
Old 05-14-2013, 11:59 AM
Dart67 Dart67 is offline
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Location: Jessieville, Arkansas
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Default IAC Question
I am trying to get my cold start fast idle to work.

I think my IAC is not working.

Is there a way to check it to see if it is opening /closing.

I have removed the IAC from the throttle body with the wiring harness connected.

No I have NOT unplugged the IAC with the power on.

Should I be able to see the IAC cycle by turning the key on and off.

I have also temporarily set the throttle follower and start IAC vs coolant temp positions to zero to see if the IAC cycles.

It does not seem to move.

After the key has been on for a while, the IAC does get warm as if it is getting power, it just does not seem to be moving.

Thanks,

Herb
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Old 05-14-2013, 04:04 PM
norbs norbs is offline
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It won;t move until you try to crank the car, try that...
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Old 05-14-2013, 04:13 PM
Frankenbean Frankenbean is offline
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What makes you think it's not working? Are you not getting a cold start high idle? Are you not showing any change to the IAC counts?
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Old 05-14-2013, 04:28 PM
Dart67 Dart67 is offline
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Originally Posted by norbs View Post
It won;t move until you try to crank the car, try that...
norbs,

Thanks I will give that a try.

Herb
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Old 05-14-2013, 04:29 PM
norbs norbs is offline
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Also if it goes open to far it will fly across the room..........
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  #6  
Old 05-14-2013, 04:39 PM
Dart67 Dart67 is offline
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Originally Posted by Frankenbean View Post
What makes you think it's not working? Are you not getting a cold start high idle? Are you not showing any change to the IAC counts?
Frankenbean,

I am trying to get the engine to cold idle at 1150 rpm.

I am following Brian's procedure that he has post in this thread http://www.efi101.com/forum/viewtopi...65ad19ada9ace5

I can not seem to get the IAC to close completely, it always draws air thru the hole in the top of the throttle body even tho I have the tables mentioned above set to zero.

I adjust according to Brains post with the warm idle set to 950RPM and after setting overnight and starting in the morning (this AM the air temp was 63*) it wants to idle around 600-650 RPM.

The IAC counts do change on the tables. It just seems the IAC does not close completely to do Brains procedure.

Herb
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Old 05-14-2013, 05:20 PM
Frankenbean Frankenbean is offline
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The IAC will open to try to maintain the idle speed you're commanding. If the engine is trying to idle below the target rpm, the IAC will open to attempt to bring it up to the desired speed.

If I understand your issue, you're saying after you set the idle when warm, the next cold start is idling too low? If that's the case, are the IAC counts maxxed out?
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Old 05-14-2013, 10:17 PM
shelbydogg shelbydogg is offline
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Herb,
With the IAC out, when shutting off the key after running, the pintle goes all the way out till it can't go anymore, then pulls back in to park itself at around 100 counts for the next startup. If you have it out of the TB it will come all the way out. Hold it in your palm with the point between your thumb and index so it doesn't go all the way out, then you should feel it push out, stop then pull back in a little bit. Have you ohmed out your 4 pins to make sure that you have the right stepper motor? Easy to rewire the plug end if needed. There are 4 wires that go to the IAC; A+, A-, B+ and B-. all in the wiring diagram. Call me if you need help.

Rob

Last edited by shelbydogg; 05-16-2013 at 07:59 AM.
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Old 05-14-2013, 10:32 PM
Dart67 Dart67 is offline
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Thanks for the info Rob.

My buddy is coming out in the AM. I will give it a try then when he can work the ign switch and I can check the IAC.

I already had plans to check the coil layouts with the ohm meter in the AM.

I am not a 100% sure that the wiring is not reversed.

I may call you with a few questions about the Power Tour if that is OK

Herb
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Old 05-14-2013, 10:44 PM
shelbydogg shelbydogg is offline
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Sure, But not going on the PT this year, but driving to Carlisle for the Mopar deal.
The PT is going through some hot states, but looks like Memphis is the closest stop to me. But lets not bore these guys with non tech stuff.

What is you IAC stepper motor off of?

Rob
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