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Idle creeps up after standing for a period of time

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    #1

    Idle creeps up after standing for a period of time

    I left the new car sitting idling this morning to dry it off a bit after doing some degreasing. I came out a bit later and it was running at about 3K rpm. Shut it off and restarted it and the idle was back at the normal rpm. I'm wondering if it was something to do with temperature, the cooling system isn't too good, and to top it off the fan clutch is shot. I remember something about idle getting bumped as temp increases.

    Any ideas?
    Builder/Owner of Badass Panther Wagons

    Busy maintaining a fleet of Fords
    Tags: None
    #2
    Fair guess. These will run the engine speed up in an overheat condition to try and cool it. Don't know how high it will go but 3k sounds a bit nuts. If the red engine light of doom was on though, I can believe it.
    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC grandpa spec white and cranberry

    1984 Lincoln Continental TurboDiesel - rolls coal

    Originally posted by phayzer5
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

    Everything looks like voodoo if you don't understand how it works

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      #3
      No lights... Also a bit hard to tell the RPM without a tach. It seemed a bit high though.

      I want to run the codes, but i can't find my damn EEC4 scanner.
      Builder/Owner of Badass Panther Wagons

      Busy maintaining a fleet of Fords

      Comment

        #4
        When the electric fan's failed on my 89 it got hot enough to throw the red light of death and it didn't bump up the idle at all.

        And reading codes with anything other then a paper clip, come on now....
        2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
        2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
        2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
        1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIP

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          #5
          throttle position sensor? i noticed my MGM was idling weird like that and it turned out is was the tps...

          1992 Mercury Grand Marquis

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            #6
            Yeah, well I have the scanner somewhere....I've always had a scanner.

            TPS looks recent. Easy enough to check.
            Builder/Owner of Badass Panther Wagons

            Busy maintaining a fleet of Fords

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              #7
              My buddies '88 marquis did weird stuff like this when his TPS was dieing. It would idle normal then hunt, then go back to normal. Then got to the point, the RPMs would jump for a bit, then go back to the hunting idle. Normally, the high engine speed would happen when at op temp.

              1981 Mercury Marquis Brougham 2-Door 302/ 5-speed -special blend (GMGT)
              1987 Lincoln Mark VII 5-speed (Errand runner)
              1989 Mercury Grand Marquis (Base Runner)
              2007 Lincoln Town Car Signature Limited (Hustlyn)
              2011 Ford Crown Victoria Police Interceptor (Down with O.P.P)

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                #8
                Had an IAC that would hang up once in a while. If you shut it off, it would reset its position. Then as it was commanded open again it would get stuck.

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