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Thread: Idle jumps up with air inrush sound.

  1. #1

    Default Idle jumps up with air inrush sound.

    New install of Sniper on SBC. Engine runs great. Idles perfect, but I'm noticing an intermittent idle increase when coming to a stop. It happens maybe 2 or 3 times on a 15 minute drive. I notice a sound of air inrush from engine compartment when this occurs. It lasts for 3 or 4 seconds and the sound stops and idle returns to normal. What can cause this and how do I fix?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
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    17,624

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    Read this thread: https://forums.holley.com/showthread...-Idle-Solution! (Holley Sniper EFI High Idle Thread)
    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

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    Danny, thank you for the response. I checked that out and now I'm wondering if maybe my issue could be from when my Electric Fan #2 comes on, since it seems to happen when temp goes up a little when I come to a stop. My car does not have A/C, and I'm not using the A/C Kick. This morning I set A/C Kick to zero, even though wire is not connected, and I did not notice the intermittent IAC idle increase. Also found that IAC motor wires were very close to a plug wire. I corrected that as well. Hopefully this solved my issue. Dennis

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