PotM GrandMarq.NET - Panther Headquarters Forum Index PotM
GMN Chat Room GMN's STORE!! GMN's Gallery Please!!
Page 1 of 3 123 LastLast
Results 1 to 20 of 44

Thread: '87 Colony Park, stutters, bucks, and stalls. Help Pls!

  1. #1
    Jeff97062
    Join Date
    Mar 2022
    Location
    Tualatin, OR
    Posts
    21

    Default '87 Colony Park, stutters, bucks, and stalls. Help Pls!

    I picked up an 87 Colony Park wagon with a 302 in it. It stalled a LOT for awhile, but I figured I'd get it sorted. Well, it's better, but only by a very little bit. I've spent 5 times what I paid for the vehicle letting a mechanic try to solve my issues. All to no avail. He fixed other stuff that probably needed fixing, but not the rough/stalling issue.

    Symptoms:
    - stalls at stop lights/signs
    - stutters and stalls when put into gear (idles in park just fine)
    - bucks when going up hills
    What I've tried to fix it, unsuccessfully:
    - replace fuel filter
    - replaced fuel pump with electronic pump
    - replaced fuel injectors
    - replaced fuel injector wiring with new wiring harness
    - replaced TFI
    - replaced Dizzy
    - Replaced sparkplug wiring
    - Replaced ECU
    - Bypassed SMOG diverter
    - Replaced fuel regulator
    - Replaced idle air control
    - smoke tested and fixed all leaking hoses that I could find

    Next steps I'm considering:
    - check spark with spark tester
    - check ignition to see if fuel is at constant PSI, even when stalls
    - Run new wire to fuel injector and ground properly (since old wire may be faulty)
    - Beat my head against the wall mercilessly....if nothing works

    I'm really at my wits end with this thing. Any help/suggestions GREATLY appreciated.
    Last edited by jeff97062; 06-21-2022 at 11:24 PM. Reason: add pic
    1987 MGM Wagon

  2. #2
    GMN Regular
    Join Date
    Oct 2008
    Location
    St. Louis, MO
    Posts
    859

    Default

    Dumb question, but when the distributor was replaced was it re-timed properly? Should be set with the SPOUT connector disconnected and at 10* before TDC iirc. Did you use an OEM Ford TFI module or aftermarket?
    These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.

  3. #3
    Jeff97062
    Join Date
    Mar 2022
    Location
    Tualatin, OR
    Posts
    21

    Default

    I think so. My mechanic did it. The TFI is after market

  4. #4
    Lost and driftin' Arquemann's Avatar
    Join Date
    Jul 2019
    Location
    Finland
    Posts
    1,399

    Default

    Check TPS and EGR, bad spots in the TPS sweep or out of calibration. EGR valve might be full of crap and hanging open.

    http://www.grandmarq.net/oldfuelinjection/page30.html
    1985 Mercury Grand Marquis LS, "Maisa"
    1995 Chevrolet Caprice Classic STW, "Sally"

  5. #5
    Wagon Addicted Tiggie's Avatar
    Join Date
    Mar 2006
    Location
    Bedford, VA
    Posts
    6,798

    Default

    In addition to the above, I don't see spark plugs on your list. I'd replace those if they haven't been replaced. Get the copper ones, usually the cheaper choice at the parts store. Easy to do yourself if you have a few hand tools.

    I'd also check to see that the base idle is correct. https://www.muscularmustangs.com/idlereset.php

    There are some other idle troubleshooting tips on that website as well.

  6. #6
    Jeff97062
    Join Date
    Mar 2022
    Location
    Tualatin, OR
    Posts
    21

    Default

    Thanks Fordman!

  7. #7
    Jeff97062
    Join Date
    Mar 2022
    Location
    Tualatin, OR
    Posts
    21

    Default

    Thanks Tiggie! Will try all this and report back!

  8. #8
    GMN Regular WagonMan's Avatar
    Join Date
    Sep 2004
    Location
    Bridgewater Ct.
    Posts
    936

    Default

    How many miles on the engine? Timing chain been replaced? WagonMan
    89 Colony Park
    90 Colony Park
    70 HEMI Daytona Convertible

  9. #9
    Still Wrenchin'! friskyfrankie's Avatar
    Join Date
    Dec 2021
    Posts
    668

    Default

    May or may not matter but I wouldn't trust an aftermarket TFI. May be difficult to find an OEM but I would make to effort to do so.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

  10. #10
    I post a lot...
    Join Date
    Dec 2011
    Location
    Yonkers NY
    Posts
    4,680

    Default

    How does it run when not trying to idle?
    03 Marauder DBP, HS, 6disk, Organizer Mods> LED's in & Out, M&Z rear control arms, Oil deflector, U-Haul Trans Pan, Blue Fuzzy Dice
    02 SL500 Silver Arrow
    08 TC Signature Limited, HID's Mods>235/55-17 Z rated Cooper Zeon RS3-A, Addco 1" rear Sway, Posi, Compustar Remote Start, floor liners, trunk organizer, Two part Sun Visors, B&M Trans drain Plug, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17
    08 Escape Limited V6 Auto, Beamtech LED headlight bulbs,

  11. #11
    Still Wrenchin'! friskyfrankie's Avatar
    Join Date
    Dec 2021
    Posts
    668

    Default

    Actually, Rockauto shows it for an '87 GM which is the same part for about $86 (MOTORCRAFT DY1284 {DU2Z12A297A} should you decide to go that way. Haven't looked at EBAY to see if the price can be beaten or anywhere else, for the matter.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

  12. #12
    Member TheEnglishChap's Avatar
    Join Date
    Jun 2022
    Location
    Lakebay, WA
    Posts
    30

    Default

    I too have an 87 CP. So here is some thoughts (if you have not done these already).
    For the plenum on the upper intake manifold and throttle body gaskets, as well as fuel pump o-ring, I used aviation grease (not sure of the motor-world name) to help with the seals. This certainly solved my high-idle (turns out I had not greased the new IAC gasket and it compressed to the point of allowing air to sneak by it in one spot).
    If not greased, you may have to get new gaskets, plenum, etc...

  13. #13
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    41,456

    Default

    1987 specifically sometimes had the old crappy single row timing chain. Would be worth checking that for slop. Only practical way of doing that without opening the engine is to remove the distributor cap and put a breaker bar on the crank. Rock the crank and note how far it turns before the rotor follows. A tight chain will be minimal movement, a sloppy one will have significant travel. If its loose enough it can give you erratic spark timing, and since fuel injector pulse comes from your ignition pickup, it makes that flaky too.


    ever scan it for codes? Sometimes that will give a lot of insight.

    honestly sounds like someone loaded up the parts cannon and just threw things at it. Some of that stuff may have needed replacing but the injector harness is not a typical fail item. Neither is the ECM. These things aren't that complicated, but they also don't have a lot in the way of self-diagnostics so it takes some obsolete knowledge (or the factory shop manual) to figure it out.

    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

  14. #14
    Jeff97062
    Join Date
    Mar 2022
    Location
    Tualatin, OR
    Posts
    21

    Default

    May be a good call TheEnglishChap. I put the idle air control in with no grease. I'll try that, along with the base idle check suggested by Tiggie.
    1987 MGM Wagon

  15. #15
    Jeff97062
    Join Date
    Mar 2022
    Location
    Tualatin, OR
    Posts
    21

    Default

    Not sure on mileage. It rolled once or twice at 99,999,999. It say 44,XXX,XXX now. So could be 144 or 244. My guess is 144,xxx,xxx
    1987 MGM Wagon

  16. #16
    Jeff97062
    Join Date
    Mar 2022
    Location
    Tualatin, OR
    Posts
    21

    Default

    Update-I checked spark on all cylinders, was okay there. I checked fuel pressure while driving. Hung around 30 PSI. Sometimes up to 39 or so, but usually around 29-30.
    Have replaced fuel pump, fuel filter (both done by my mechanic) also fuel regulator. That pressure seems way low. But what could be impeding flow if I already had all that crap replaced? Maybe something is bad, but that seems like a low percentage chance

  17. #17
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    23,230

    Default

    fuel pressure is correct. Should be ~30 at idle (full vacuum) and ~40 at WOT (no vacuum).

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  18. #18
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    41,456

    Default

    yep, perfectly fine, allowing for gauge error and regulator tolerances.

    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

  19. #19
    I post a lot...
    Join Date
    Dec 2011
    Location
    Yonkers NY
    Posts
    4,680

    Default

    Does that thing have a map?
    03 Marauder DBP, HS, 6disk, Organizer Mods> LED's in & Out, M&Z rear control arms, Oil deflector, U-Haul Trans Pan, Blue Fuzzy Dice
    02 SL500 Silver Arrow
    08 TC Signature Limited, HID's Mods>235/55-17 Z rated Cooper Zeon RS3-A, Addco 1" rear Sway, Posi, Compustar Remote Start, floor liners, trunk organizer, Two part Sun Visors, B&M Trans drain Plug, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17
    08 Escape Limited V6 Auto, Beamtech LED headlight bulbs,

  20. #20
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    41,456

    Default

    sensor, yes. firewall, above and behind the passenger side valve cover usually.

    I have had one go bad, and the engine ran extremely rich. Oddly it ran normally when unplugged. My best guess is the diaphragm inside broke and for whatever reason the position stuff sits in with vacuum and working is approximately the same position it sits in with no vacuum and broken.

    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

Page 1 of 3 123 LastLast

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