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  1. #1

    Default High RPM Question

    On first startup, RPM was reading around 1300. Hot idle was set at 790. As temp began to climb, there was no decrease in RPM. About four minutes in running, RPM then shot up, so I turned ignition off. Anyone out there have any ideas what would cause this?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,280

    Default

    Ensure the spark plug wires (or any other high voltage wiring) aren't too close to the IAC motor/wiring. The IAC motor is easily susceptible to this, and I've dealt with it causing strange occurrences (from helping others).
    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 for the info, I'll double check.

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