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What IAC to use.... Need advice!!!

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Old May 22, 2012 | 09:02 AM
  #1  
DBRjeep350TPI's Avatar
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What IAC to use.... Need advice!!!

I know that someone out has got to know the difference between the IAC for the different years…
I think I may need a new IAC but not sure what one I need. I have a 87’ TPI unit and TB for that year, but converted to a speed density utilizing the 1227730 ECU. This is my question and I cant see to get a solid answer.

On 85-88 IROC they used they used an IAC (Standard part number AC-1) and on the 89-92 they use IAC (Standard part number AC-16). The cost between the two IAC is about 60 bucks. But more importantly I am not sure what one I should be using for my converted system.

I am thinking that I need the AC-16 for the speed density system for the computer to read the signal correctly… then again I am thinking that I need the AC-1 for the pinnacle to extend/contract the distances needed for the IAC housing.

Any help or guidance would be much appreciated.
Thanks
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Old May 22, 2012 | 10:30 AM
  #2  
Dyno Don's Avatar
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Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: What IAC to use.... Need advice!!!

I am also dealing with this, I bought a '87 IAC for a '87 system and it didn't work, bought one for the '90-'92 and it worked fine.
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Old May 22, 2012 | 10:38 AM
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Tuned Performance's Avatar
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Re: What IAC to use.... Need advice!!!

There was a second post on this !

https://www.thirdgen.org/forums/tpi/...t-iac-use.html
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