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Thread: Throttle Body & IAC

  1. #1

    Default Throttle Body & IAC

    Hi, my TBI has no IAC port on it. My question is, I have the 550-602 harness, will it work without an IAC port, or do I need one with an IAC port like the Holley# 860004TB? Any help will be great. Has turbos.

  2. #2
    Join Date
    Dec 2009
    Location
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    An IAC valve is not mandatory. It's a nice option (especially for cold start & warmup), but not absolutely necessary.
    If your throttle body doesn't have an IAC valve, and you want one, you can purchase a remote IAC valve assembly.
    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

  3. #3

    Default

    Thanks Danny. Can you give me some part numbers on the TPS, MAP & IAC that will work for my engine? And again, thanks for the help.

  4. #4
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    Dec 2009
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    http://forums.holley.com/showthread....=2760#post2760 (Replacement Sensors For Holley EFI - Auto Parts Store)
    http://documents.holley.com/efi_sele...chart62914.pdf (Holley HP & Dominator EFI Component Selection Guide)
    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

  5. #5

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    The MAP PN #554-134 & IAT PN #534-20. My question is, where is the ideal location for them? Thanks.

  6. #6
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    Dec 2009
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    Connecticut
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    The MAP sensor should be on its own separate hose; not shared with anything else. Also, the MAP sensor vacuum hose should be connected to the plenum (not an individual runner). The IAT sensor depends if you're actually using it as an IAT (intake air temp) sensor, or a MAT (manifold air temp) sensor.
    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

  7. #7

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    I think the wire harness is marked MAT. I have the actual IAT sensor. The MAP sensor has 1/8 inch pipe threads, so I screw it into the intake plenum.

  8. #8
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    Quote Originally Posted by roebuck View Post
    I think the wire harness is marked MAT. I have the actual IAT sensor.
    You're missing the point. That same sensor can be used as a MAT or IAT sensor.

    The MAP sensor has 1/8 inch pipe threads, so I screw it into the intake plenum.
    1-piece hose barb adapter fittings are available for the 1/8" NPT threads. (Excessive engine vibration could damage the sensor.)
    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

  9. #9

    Default

    Thanks Danny.

  10. #10
    Join Date
    Nov 2017
    Location
    Houston
    Posts
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    Default

    Sorry to hijack the thread, but Danny, your saying an IAC is not a must have? I'm asking because I'm planning on using a Accufab V-band 90mm throttle body that does not have an IAC port. Car is 75% track/25% street. Thank you.

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