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Thread: 1986 town car struggling to idle.

  1. #1

    Default 1986 town car struggling to idle.

    My 1986 town car come with one issue it likes to die when you first get it started up, but once you get it going itís fine. Itís an odd crap shoot.

    But when itís finally idling itís steady at 800rpm, but if itís struggling and you try to move the car it dies.

    So what do I need to look for?

    I cleaned out the Idle control valve And that did barely anything. Itís weird that once you get it going itís fine.

    So if itís warmed up or not has no effect? So what could cause this.
    Last edited by DrHax; 05-13-2019 at 08:20 AM.

  2. #2
    Approaching 2 decades of DDing Box Panthers VicCrownVic's Avatar
    Join Date
    Nov 2012
    Shelby Township, MI


    Engine Coolant Temperature (ECT) sensor is a likely culprit.

    Also the Air Charge Temperature (ACT, also referred to as the Intake Air Temperature (IAT)) sensor could be at fault.

    ECT is on the front passenger side of the engine where the hose that runs back to the heater core is connected.
    ACT is on the front driver side of the lower intake.

    Those two sensors, in that order, is where I would start.

    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - I'll fix it eventually
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - My rotting winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  3. #3
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005


    do you have another known-working IAC? if the sensors are good, it could just be the IAC is bad.

    Is the SPOUT connector missing? That has a lot to do with idle control too.

    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 SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

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

  4. #4
    I post a lot... knucklehead0202's Avatar
    Join Date
    Apr 2015
    Southern Commiefornia


    ACT and ECT sensors are a good start, and cheap enough it doesn't hurt to throw them at it anyway. Vacuum leaks is always the first place i go though.

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