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Thread: My '85 MGM, "Maisa"

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    Member Arquemann's Avatar
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    Default My '85 MGM, "Maisa"

    Here is the thread I should've done the second day on this forum.
    Her name is Maisa, and she's a bit stubborn and temperamental. As some of you are already aware of

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    I paid about 5000€, since I've thrown in about 2000€ more, and it's still not okay.
    Bought in June 2019, from the second owner (old lady falling victim to dementia), she had the car from '91. Florida car, imported to Finland in '01 or '02.
    Original FL plate D66 LZG, VIN 2MEBP95F2FX635235. (If you yanks have some free car history sites available, I want to know as much as possible about it's history, since I have none).

    -1985 Mercury Grand Marquis LS
    -5.0 Central Fuel Injection (for now...)
    -Faded white paint, porn red interior, slightly sunburnt, otherwise mint
    -Automatic Temperature Control (which actually works really well!)
    -Cruise Control that worked exactly twice
    -Power antenna, locks, windows and seats
    -Currently sitting at ~103000 miles, those 3k from me last year.

    When I got the car, it was maybe too original...
    -Original plug wires
    -Original timing chain
    -Original engine sensors except for O2

    Overall the car is in pretty nice condition, except for the engine issues and faded paint, no clunks, rattles or squeaks, barely any rust.
    Driver door is misaligned so wind makes a lot of noise. And a dozen of other minor things, more coming later.

    The car could be quite easily registered as a "museum/historical vehicle", but that means keeping it in factory-like condition.
    I'm not really into that kinda stuff, I'm thinking lowered, some classic chrome wheels, meaner attitude and a nice rumbling V8. A bit of a hot rod / street rod. Currently it's too much of a grandpa's church-mobile.
    I don't want a garage queen, I want to cruise, drive it alot, enjoy it and not worry about little things.

    All in good time, number one priority is to get the engine running good and smooth.
    Last edited by Arquemann; 03-27-2020 at 02:24 PM.
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

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    Member Arquemann's Avatar
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    For recap and archiving reasons:

    Misfire at idle and lower rpms, cruising and deceling. Causes jerkiness when cruising up to about 50 MPH. Smooth as butter when properly accelerating.

    Also:
    -EGR acted really stupid until CFI unit rebuild, now it doesnt get any vacuum
    -Fast idle is broken
    -Smog pump system probably works correctly
    -Snorkel hot air flap is dead

    Parts changed last summer:
    -Probably every single engine sensor
    -Fuel filter, injectors, pressure regulator
    -Plugs, wires, entire distributor, TFI module & it's connector
    -CFI unit rebuilt
    -ECM
    -Double roller timing set
    -Alternator & used voltage regulator (reg failed, not alt)
    -PCV
    -Oil & filter
    -Metal TV bushing



    Onto today, 27th of March, 2020:
    -Out of storage
    -Fresh tank of gas
    -Still misfires
    -I think I overfilled the tank and it pissed some on the driveway, at a slight downhill
    -No KOEO codes (systems pass), couldn't get KOER codes even with instructions
    -Getting on the throttle seems a bit sluggish
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

  3. #3
    I'm an air-conditioned gypsy gadget73's Avatar
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    ever done a compression test on this thing to verify its actually got 8 healthy cylinders?

    When you say CFI unit rebuild, what did that entail?

    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

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    Member Arquemann's Avatar
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    Quote Originally Posted by gadget73 View Post
    ever done a compression test on this thing to verify its actually got 8 healthy cylinders?

    When you say CFI unit rebuild, what did that entail?
    I've done a compression test, a bit wonky how I did it but I got pretty even numbers. Redoing it with a proper screw-on tester definitely wouldn't hurt.

    I'm guessing the CFI "rebuild kit" included new seals and such, probably got cleaned to. (This was done by the shop)
    I wonder if the top part has a gasket like carbs do, and it happened to go upsidedown so it'll block the egr vacuum passage.
    Car doesn't really feel any different from before - after the shop visit.

    Tomorrow I'm thinking on checking the engine harness grounds and probably start opening up the wiring after that.
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

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    I'm an air-conditioned gypsy gadget73's Avatar
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    no internal gaskets. Only thing in there are the injectors and O rings. No vacuum passages either. Supply for the EGR comes off the manifold. I think the 85 uses two valves to make the EGR work, one is the control solenoid and the other is the vent. Supply should go to the control, then out to both the vent and the valve. Control opens it, vent lets it shut. Either way, so long as the egr valve remains closed it shouldn't cause any real running issues.

    I've actually got a 1984 diag manual in the mail, should mostly apply to your 85. When it shows up I'll see if i can offer some more specific troubleshooting info from it.

    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

  6. #6
    The Brown Blob 87gtVIC's Avatar
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    She is a looker eve with faded paint. Hope you get things sorted out this season.
    ~David~

    My 1987 Crown Victoria Coupe: The Brown Blob
    My 2004 Mercedes Benz E320:The Benz

    Quote Originally Posted by DerekTheGreat View Post
    But, that's just coming from me, this site's biggest pessimist. Best of luck

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    Member Arquemann's Avatar
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    Quote Originally Posted by gadget73 View Post
    no internal gaskets. Only thing in there are the injectors and O rings. No vacuum passages either. Supply for the EGR comes off the manifold. I think the 85 uses two valves to make the EGR work, one is the control solenoid and the other is the vent. Supply should go to the control, then out to both the vent and the valve. Control opens it, vent lets it shut. Either way, so long as the egr valve remains closed it shouldn't cause any real running issues.
    Here's how my EGR is currently:
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    (images are old, before the shop visit aka stuff is old and dirty)

    The line I'm holding with my finger goes to the EGR Valve, line marked with red goes from underside of the CFI unit's top plate -thing to the EGR solenoids.
    I haven't had any reason to believe this is incorrect, but it is?

    I haven't taken apart the CFI unit myself, is is just the the fuel passages and the injector wiring connectors?
    EVTM would be super handy to have, the credit card sized smudgy sticker on the core support isnt exactly useful.
    It seems that I can't trust the wiring and vacuum routing, even though the car is very much untouched otherwise.


    Today I'll get to checking the grounds.
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

  8. #8
    I'm an air-conditioned gypsy gadget73's Avatar
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    I believe thats right, 2 solenoids connected to the EGR line would be control and vent.

    yep, just fuel and wiring connections in there. Its not like a carb, no small passages for fuel or any of that. Supply line in, the round thing in the back is the regulator, it sends any excess pressure back to the tank through the return line.

    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
    Member Arquemann's Avatar
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    G120 ground looks like this. The uninsulated wire goes to the aluminium shielding covering some of the wires from the TFI connector.
    Kind of a dead end there since its a ground.

    I removed some of the sheathing and tape from the main wiring bunches and everything under seems clean and original-looking, nothing really looks damaged or chafed in any way.
    Main battery to block ground seems fine, I can't see the ground on the RH cyl head at all due to the air tube.

    There's so much to test and try, I'm seriously running out of skill. Because of my lack of knowledge, my patience is running thin and I hate that.

    I snapped a pic of the vacuum routing sticker, so I can see better
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    Also I got the new trunk seal in, wiped away probably 35 years of dirt, the new seal is a snug fit and I got the ends butted pretty tight. I put the seam above the taillight so it doesnt get splashes. Now I actually have to press a bit for trunk to shut, its just perfect.
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    I was going to fix the small leak from behind the RH taillight, but rain scared me away and it's going to be around freezing to around Thu, so I won't even try sealing it.
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

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    Quote Originally Posted by gadget73 View Post
    I believe thats right, 2 solenoids connected to the EGR line would be control and vent.
    So it's the EGR vent line. Upon further inspection, it's just a hole to the top of the CFI unit.
    I'm fucking dumb.
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

  11. #11

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    Arenít those for the thermactor system?


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    Quote Originally Posted by 87GrandMarq View Post
    Aren’t those for the thermactor system?
    Thermactor solenoids, TAB & TAD are on the RH inner fender:
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    Under the 2 connectors in picture

    Solenoids on the valve cover are the heat flap control, EGR solenoids and throttle kicker.
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    Pic courtesy of matth825 (would you mind copying the whole book for me? )
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

  13. #13
    I'm an air-conditioned gypsy gadget73's Avatar
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    thermactor ones are over on the fender.

    might be worth pulling and cleaning the grounds anyway. Won't hurt it any to be hit with a wire brush and get a wipe of spark plug grease to keep it from corroding. The ground to the engine is probably more important though. I think on a CFI car it bolts to the back of the head. Thats the sensor ground and things get dumb if that is bad.

    those manuals can be found for not much money on ebay. Shipping would probably cost more than the book.
    Last edited by gadget73; 03-28-2020 at 12:12 PM.

    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

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    Well then disregard, its been a while since I had a cfi car.


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    Yeah, I can find 1 EVTM on ebay, 10 bucks and about 40 for shipping lol

    Now to figure out how I can get at the ground on the back of the cylinder head, a bajillion tubes in the way and mostly the rigid air tube right in front.
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

  16. #16
    I'm an air-conditioned gypsy gadget73's Avatar
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    first just make sure its connected and not just hanging loose. If the wire busted off the terminal you can re-connect it to the intake or something that is more accessible. It just needs to connect to the engine and be in good shape.

    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

  17. #17
    Member Arquemann's Avatar
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    I got around to the ground at the back of the head, tiny orange wire, seems fine and solid.
    There's also a thick black wire going to I believe here:
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    A bracket just to side of the blower motor casing.

    As I was putting back the cruise control servo, I somehow caught a vacuum line between something and that damn thin plastic line shattered like it's been next to a hot engine for the last 35 years.
    The line attaches to this puck-thing on the fender:
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    What is the purpose of it?
    Looking at the vacuum routing sticker, the plumbing would indicate it's the "VRESER", but isn't that the soup can further forward?
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    Trying to plug the broken off plastic line with duct take, yanked it a bit and another line shattered. This time the line that goes from the "T" to the TAD solenoid.

    Went for a drive today with the o2 sensor unplugged, no change really. That rules out fuel delivery, right?
    Now that I've driven it a bit more, I can say that the misfiring / jerkiness is worst at around 25 mph, it gets better going faster, still annoying at 40, finally at around 50-55 I can't notice anything really.
    It idle, I can see the engine shaking irregularly and in my little experience, it doesn't seem right at all. These completely stock LoPos are supposed to idle and run buttery smooth?
    Attached Thumbnails Attached Thumbnails 20200328_144555.jpg  
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

  18. #18

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    Hmm mine used to run great with the o2 sensor unplugged lol, otherwise it had the typical cfi rolling idle. My guess would be a fuel delivery issue or perhaps a vacuum leak somewhere but thats just a guess. Have you tried capping off one system at a time to try to narrow down where a possible vacuum leak could be? How does your vacuum tree look? Also have you put a vacuum gauge on a vacuum line and ran a vacuum test? Its easy and tells you a lot about how the motor is running.

    https://dannysengineportal.com/vacuu...han-you-think/

    I had some of those tiny black vacuum lines go bad so I picked up a roll from autozone and some rubber connectors to slide the lines into for my ac and all has been well. I bet you could get some off ebay for cheap to replace the pieces of broken vacuum lines.


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  19. #19
    Member Arquemann's Avatar
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    Quote Originally Posted by 87GrandMarq View Post
    Hmm mine used to run great with the o2 sensor unplugged lol, otherwise it had the typical cfi rolling idle. My guess would be a fuel delivery issue or perhaps a vacuum leak somewhere but thats just a guess. Have you tried capping off one system at a time to try to narrow down where a possible vacuum leak could be? How does your vacuum tree look? Also have you put a vacuum gauge on a vacuum line and ran a vacuum test? Its easy and tells you a lot about how the motor is running.

    https://dannysengineportal.com/vacuu...han-you-think/

    I had some of those tiny black vacuum lines go bad so I picked up a roll from autozone and some rubber connectors to slide the lines into for my ac and all has been well. I bet you could get some off ebay for cheap to replace the pieces of broken vacuum lines.
    What do you mean by "rolling idle"?
    My idle is very steady, but the engine shakes irregularly and listening to the exhaust, there's a similarly irregular "plop" sound

    I hunted down quite a few vacuum leaks last year, last time there was a very minor leak in the heater controls (from vac tree to inside) also the throttle kicker is supposed to leak a bit yes?
    I should go through all the stuff again for sure, first I've got to replace at least the lines that broke today.
    Ought to be able to get cheap vacuum hose and fittings from a local parts store.

    I'd like to know what all can I plug off temporarily to run the car while doing such vacuum tests.
    1985 Mercury Grand Marquis LS
    1997 Volvo 850 GLE Estate

  20. #20
    I'm an air-conditioned gypsy gadget73's Avatar
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    The puck thing is the vacuum reservoir for the thermactor solenoids. Soup can is for the climate control and won't be on the label under the hood. Thats purely for emissions stuff.

    I usually use rubber hose to replace the petrified plastic line. If its colored hose, get some heat shrink or zip ties in the proper color to ID it if you like.

    When CFI cars are right, they will typically idle smooth to the point you hardly know its running. Rough running is not something they are meant to do, but they do it when stuff is wrong.

    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

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