PotM GrandMarq.NET - Panther Headquarters Forum Index PotM
GMN Chat Room GMN's STORE!! GMN's Gallery Please!!
Results 1 to 9 of 9

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
    Location
    Shelby Township, MI
    Posts
    2,739

    Default

    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.
    Vic

    ~ 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
    Posts
    37,506

    Default

    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
    Location
    Southern Commiefornia
    Posts
    2,082

    Default

    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.

  5. #5

    Default

    I bought an obd1 Ford Code reader from amazon and it gave me some codes.
    The First one was 63 c which is TPS below voltage which I swapped out the one from the town car with the 86 Vic. Now the car isnít dying instantly! Hurray!

    The other codes I got were
    12R and 21R
    Which means idle too high and ECT sensor failure.

    The code reader was worth every penny. With my concussion not having to deal with Morse code paper clip stuff makes my life easy.

  6. #6
    Road Warrior Kodachrome Wolf's Avatar
    Join Date
    Nov 2014
    Location
    Evans, GA
    Posts
    1,352

    Default

    Regarding the ECT one, was the car fully warmed up before doing the test?

    My Cars:
    -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 POTM Winner
    -1989 Sable LS Wagon (88,710 Miles) - Sold
    -1997 Grand Marquis LS (210K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

  7. #7

    Default

    Quote Originally Posted by Kodachrome Wolf View Post
    Regarding the ECT one, was the car fully warmed up before doing the test?
    Yes, and I replaced the ECT and the idle is now normal.

  8. #8
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    37,506

    Default

    good deal.

    12 doesn't actually mean the idle is high. It means it couldn't be raised enough to satisfy the test.

    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

  9. #9

    Default

    Ah maybe I misread the code book either way the car runs great and is absurdly silent with the new tires.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
GMN Approved Links!


www.rockauto.com www.adtr.net