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Thread: General IAC Info & Ford PWM IAC Wiring

  1. #31
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    14,317

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    It depends on how well the idle quality is tuned.
    A good idle will only fluctuate the Idle Spark control about +/ 2°-3°.
    A poor idle can fluctuate the Idle Spark control as much as +/ 8°-9°.
    http://forums.holley.com/showthread....e-Tuning-Notes (Read "Idle Spark Control Tuning".)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  2. #32

    Default

    So +/ 8°-9° spark timing is the maximum the Holley will use to control idle speed. The engine's previous Mercruiser PCM555 would use about four times that, is why I asked. Thank you.

  3. #33

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    Can any one tell me the PID IAC control values used when "FAST", "Medium" or "Slow" is selected in Advanced Idle Control? Thanks, Bullshark.

  4. #34
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    14,317

    Default

    Contact Holley Tech Service (LINK), since those aren't in the Help Contents.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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