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Thread: Initial Setup of TBI, TPI and MPFI systems. Min Air Adjust, TPS set and Fuel Pressure

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  1. #1
    RIP EagleMark's Avatar
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    I don't know what I did the first time I had one out of TBI unit on my test bench but when I turned system on... or jumped A and B on ALDL it came flying out! There was no tiny movement!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  2. #2
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    that would be the IAC reset function of the ECM. it pulses the IAC at either 80 or 160 Hz (or at least it does on later systems) to fully extend/retract/whatever.

    obviously, it's not a single pulse that does that.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


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