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Thread: Chrysler iac with 7427 pcm

  1. #1
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    Chrysler iac with 7427 pcm

    Has anyone controlled a chrysler iac with gm computer. They both have a+b high and low.
    6395, BHDF, 7.4 BBC lightly modded now 6395 BMHM back to BHDF

  2. #2
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    i don't suppose you can measure the impedance of one? if it's reasonably close to or higher than a GM unit, there really isn't a reason it couldn't be controlled. it's almost certainly capable of running at the 80Hz rate that a lot of the OBD1 ECMs control them at. I think the only time they're run above that is at 160Hz for the initial key-on positioning.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  3. #3
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    I don't have one to measure but with your info and my thought that it should work I have ordered the throttle body that uses one. At worst I will have try and adapt a gm style.
    6395, BHDF, 7.4 BBC lightly modded now 6395 BMHM back to BHDF

  4. #4
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    have a year/engine/model that it's intended for? I may be able to look up the specs.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  5. #5
    Super Moderator Six_Shooter's Avatar
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    It'll work, but the pinout is typically different between GM and Chrysler IACs, even though they appear to be physically identical.

    If for some reason it doesn't work, a GM IAC should drop in place of the Chrysler IAC.
    The man who says something is impossible, is usually interrupted by the man doing it.

  6. #6
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    The iac is what comes on a holley terminator throttle body. The manual indicates a chrysler iac and it does have a pinout diagram. Also good to know that a gm iac probably will fit in its place if I can't make it work.
    6395, BHDF, 7.4 BBC lightly modded now 6395 BMHM back to BHDF

  7. #7
    Fuel Injected! JeepsAndGuns's Avatar
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    I have run a IAC from a jeep 4.0 with a 16197427. I just sat there and swapped the pins around until I found a combo that worked.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  8. #8
    Super Moderator Six_Shooter's Avatar
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    Quote Originally Posted by myburb View Post
    The iac is what comes on a holley terminator throttle body. The manual indicates a chrysler iac and it does have a pinout diagram. Also good to know that a gm iac probably will fit in its place if I can't make it work.
    Yes, Holley uses Chryco IACs, so you definitely need to change the pinout. I ran into this with a friend's 496 Pontiac that we installed MS3Pro and custom fuel injection setup on that used a Holley throttle body.
    The man who says something is impossible, is usually interrupted by the man doing it.

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