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Thread: High idle @ hot start?

  1. #1

    Default High idle @ hot start?

    Everything runs great on my Sniper kit! The only thing that bothers me is when the car is dead cold, you fire it and it immediately goes to set idle speed. Doesn't die or anything, but no high idle. Now, when you drive around and get the engine all warmed up, shut the car off and when I go to restart VAROOM! Revs up to about 1,800-2,000 for 4-5 seconds! I found a setting that changed the amount of time it hangs, and reduced that a bunch and it's better, but shouldn't the high idle be when the engine is cold (like all modern day cars)? And at a hot start go right to target idle? Seems to be backwards. Can you set that target idle for a high idle? Any input? Other than that the car runs great! Little stumble off idle or light throttle input, but not that bad.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,289

    Default

    Check your IAC Parked Position (in the Idle ICF). Also the Startup IAC Position - Hold Time & Decay Time.
    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

    I have the same issue with my Sniper. What changes did you make or recommend as a starting point, so I can have at least an idea? I'm using the stock cam setup.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,289

    Default

    My Startup IAC Position - Hold Time & Decay Time is 1.5 seconds. My hot IAC Parked Position is 70%, but that's probably too high for your engine/application.
    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

    Default

    I'll use those settings see what my engine does, and go from there. Thanks.

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