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    Intermittent high idle

    Does anyone have any input on what can cause an intermittent high idle? Its on a 88 grand marquis 5.0, seems to only be when its cold. I know when I start it in the morning it'll idle high like it supposed to but every once in a while it won't drop down, it also won't start some mornings either without me giving it some gas to keep it running. I ran a scan tool on it and the only codes I got were 44 and 94, I have all the air pump equipment removed so I know thats where thats coming from. As far as I know there is no vacuum leaks, and so far the TPS and bank one o2 sensor have been replaced and I got the EGR valve to work within the past few months. Could the IAC possibly be sticking with the cold weather? Does anyone know what I could test to figure out what the problem is?
    Thanks for the help!!!

    #2
    Have you ever taken your IAC off to clean? It is entirely possible that it's sticking. The IAC and TPS are basically in control of the idle speed of these cars unless there's unmetered air getting past the throttle blade.



    Check again for vac leaks (either put a gauge on it or go hunting)
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    - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

    - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

    - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

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