PotM GrandMarq.NET - Panther Headquarters Forum Index PotM
GMN Chat Room GMN's STORE!! GMN's Gallery Please!!
Page 1 of 2 12 LastLast
Results 1 to 20 of 26

Thread: Idle Issue?

  1. #1
    Poncho
    Join Date
    Mar 2009
    Location
    East TN
    Posts
    81

    Default Idle Issue?

    Greetings
    So I am having idle issues with my '87 Grand Marquis. First I had a cracked fuel injector so I replaced it with a buddy of mine. The car started and drove fine before it, and it started and drove fine the first time after replacing it. But as I tried to start the car afterwards, it would turn over but wouldn't keep an idle. I tried it again while giving it some gas and it held an idle after I gently gave it gas for about 45 seconds or so. I drove it home, and as I was pulling into my driveway coming up the hill, it idled out again and I had to basically start it while giving it gas and shifting and giving it gas. Any suggestions on what my problem may be? As always thanks guys!
    @Ryan.Madison68

  2. #2
    Member EaOutlaw1969's Avatar
    Join Date
    Feb 2018
    Location
    West lake Worth Florida ( Palm Beach County )
    Posts
    353

    Default

    I would start by looking for a vacuum line that may have cracked or fallen off during or after the injector replacement. if you have old brittle vac lines replace them all.
    2000 MGM LS Palm Beach Edition a work in progress

  3. #3
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    37,506

    Default

    the line to the MAP sensor is very prone to failing, and it will run absolutely awful if that happens.

    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
    Poncho
    Join Date
    Mar 2009
    Location
    East TN
    Posts
    81

    Default

    Thanks for the input. For the rooks(me), where's the MAP sensor?
    @Ryan.Madison68

  5. #5
    Wagon Addicted Tiggie's Avatar
    Join Date
    Mar 2006
    Location
    Bedford, VA
    Posts
    4,981

    Default

    Quote Originally Posted by LeviMM View Post
    Thanks for the input. For the rooks(me), where's the MAP sensor?


    Basically on the firewall above the passenger valve cover. Black with wiring harness and single vacuum line going to it.



    Sent from my iPhone using Tapatalk
    1988 Crown Vic Wagon - daily
    1990 Country Squire - weekend cruiser, former lawn ornament
    Other: 95 Ranger, 74 F250, 68 Mustang, 94 Mustang
    Sold: 1982 LTD and 1987 Crown Vic

    GMN Box Panther History
    Box Panther Horsepower and Torque Ratings
    Box Panther Production Numbers

  6. #6
    Poncho
    Join Date
    Mar 2009
    Location
    East TN
    Posts
    81

    Default

    Excellent help guys! So here's an update. I went to turn it on today and it started fine. I let it idle for awhile and it was running good other than the periodical surge idle. After letting it idle for awhile, I tried to chnage in to reverse and it turned off. It's something i've dealt with for awhile. What causes that? It started back up again fine. And I let it idle again for awhile. The tailpipes were dripping water which is a good sign, right? It has been sitting with gas in the tank for about 3 or so months. I checked the MAP sensor and it was connected but i did notice a red vaccuum line near the EGR not connected.(See the picture) Where should it be going? Also does the vacuum line with the silver cap be hanging out as such? (See picture)

    Another issue i'm having as well once it gets up to temp around 195 degrees and the thermostat opens up, antifreeze starts leaking/spraying out somewhere. I can smell it burning on the valve cover and droplets are on the hoses around the rear of the driver's side valve cover near the IAC. What do you think is the culprit?

    Thanks again guys!



    @Ryan.Madison68

  7. #7

    Default

    Is your idle adjusted correctly? Do you still have your smog pump? Im pretty sure a few of those vacuum lines are supposed to go to the smog pump.


    Sent from my iPhone using Tapatalk

  8. #8
    Road Warrior Kodachrome Wolf's Avatar
    Join Date
    Nov 2014
    Location
    Evans, GA
    Posts
    1,352

    Default

    The red line should go to the vacuum tree at the back of the upper intake. It feeds the vacuum supply for the EGR, TAB, and TAD solenoids.

    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

  9. #9
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    20,897

    Default

    The coolant leak is probably the EGR cooler lines. There's 2 small diameter hoses that go to the spacer behind the throttle body. The leak is probably from the short one that goes from the spacer to a nipple down near the back of the intake manifold. Can't remember if it's on the manifold or the head, but it's in that area. Those are probably the most overlooked hoses on these cars.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    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.

  10. #10

    Default

    It connects to the lower intake manifold but it rusts out so thats probably the issue like you said. The one on my intake I got from a mustang was rusted to pieces so I just said screw it and deleted the egr cooler lines.


    Sent from my iPhone using Tapatalk

  11. #11
    Wagon Addicted Tiggie's Avatar
    Join Date
    Mar 2006
    Location
    Bedford, VA
    Posts
    4,981

    Default

    That silver thing in picture 2 looks a lot like a PCV valve. It should be into the back side of the lower intake, if it is the PCV valve.
    1988 Crown Vic Wagon - daily
    1990 Country Squire - weekend cruiser, former lawn ornament
    Other: 95 Ranger, 74 F250, 68 Mustang, 94 Mustang
    Sold: 1982 LTD and 1987 Crown Vic

    GMN Box Panther History
    Box Panther Horsepower and Torque Ratings
    Box Panther Production Numbers

  12. #12
    Approaching 2 decades of DDing Box Panthers VicCrownVic's Avatar
    Join Date
    Nov 2012
    Location
    Shelby Township, MI
    Posts
    2,739

    Default

    Quote Originally Posted by LeviMM View Post
    ...Also does the vacuum line with the silver cap be hanging out as such? (See picture)

    That looks like a PCV valve, but that's not where you would normally find that.

    The PCV should be on the back of the engine mounted in the lower intake. One hose going from the underside of the upper intake to the PCV.

    2 things to ignore in the picture below:
    • Our cars do not have a tee in the hose, it's just one hose.
    • The upper intake in the picture is backwards, but the idea is the same on our cars.


    Click image for larger version. 

Name:	11_27_2015_5_51_28_am.jpg 
Views:	14 
Size:	18.0 KB 
ID:	51822
    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


  13. #13
    Poncho
    Join Date
    Mar 2009
    Location
    East TN
    Posts
    81

    Default

    Here's another update.. So i think i figured out the where the PCV valve connects to from the upper intake. It fit into the hole so i took that as a good sign. Is the arrow in the picture accurate for the PCV valve? Thanks for the picture VicCrownVic showing where it was located!

    And next is this the MAP sensor mentioned earlier? Do you all see any issues with it? The hose felt good when I checked it.

    Also are these the hoses for the EGR cooler lines? What's the process for the delete? Is it a simple plugging the end of the line? I probably should search the forum for more info. Thanks again guys.
    @Ryan.Madison68

  14. #14
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    20,897

    Default

    yes. big hole in the rear of the lower intake is where the PCV lives.

    "looks fine" but it may still have issues. Unplug the electrical connector to the MAP sensor. If the engine runs the same or better, it's bad. If the engine runs worse, it's fine.

    And yes, that's the EGR cooler lines.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    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.

  15. #15
    Poncho
    Join Date
    Mar 2009
    Location
    East TN
    Posts
    81

    Default

    Thanks, Sly. I'll try that. Where does the MAP hose connect to?
    @Ryan.Madison68

  16. #16
    Road Warrior Kodachrome Wolf's Avatar
    Join Date
    Nov 2014
    Location
    Evans, GA
    Posts
    1,352

    Default

    MAP hose connects directly to the upper intake via a barb on the underside.

    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

  17. #17
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    37,506

    Default

    the EGR cooler lines have 2 ends. One is down on the lower manifold in the corner. The other connects to the steel pipe running under the upper manifold on the passenger side. Both need to be capped off, and if you're doing it you should seal them as close to where they connect to the engine as possible, otherwise you've still got the hose that can fail. Or just replace the hose if its working otherwise.

    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

  18. #18
    Poncho
    Join Date
    Mar 2009
    Location
    East TN
    Posts
    81

    Default

    Thanks guys. So the car seems to be running a lot smoother with the PCV connected. Who knew?! The EGR cooler lines is my next point of concern. I was watching it today as it warmed up and the leak seems to be coming from the lower hose of the EGR cooler line. First question.. Would it be enough to cap the line at the throttle body connection and zip tie the hose to the other one and leave it? It's kind of a lazy approach, but I only bring it up bexause it seems like the hose goes to upper manifold in a place where I won't be able to reach it. Also could it be something as simple as the hose not being clamped properly at the right spot. I let a guy work on my car who I probably should haver thought twice about that looking back. I'll try moving the clamp a bit durther down the hose first. Also will any cap fitting do for this line. Dies anybody know the diameter?
    @Ryan.Madison68

  19. #19
    I'm an air-conditioned gypsy gadget73's Avatar
    Join Date
    Jan 2005
    Posts
    37,506

    Default

    probably not since the hose is likely the issue. You may be able to just trim the end off the hose and re-attach it though. Pretty sure its 5/16".

    The upper really needs to come off for decent access to these things.

    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

  20. #20
    Beater gonna beat sly's Avatar
    Join Date
    Mar 2010
    Location
    Lewisville, TX
    Posts
    20,897

    Default

    When I bypassed that on the 88 I used to have, I pulled the short hose from the lower intake and connected the long hose to the EGR spacer to the lower intake. Then used the short hose looped back on the EGR spacer to make sure there was no leaks should the gasket on the egr spacer have any issues internally. I did have to trim about an inch from the end of the long hose for some good hose to seal on the barb.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    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.

Page 1 of 2 12 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