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1993 Lincoln Towncar Won' Start
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smi889
Novice
Sep 18, 2007, 6:39 AM
Post #1 of 13
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1993 Lincoln Towncar Won' Start
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Car all of a sudden wouldn't start one day. Fuel pressure 40PSI, spark thru plugs, power to injectors, cranks well, spray into intake and it fires. I'm down to the ECM. Loosened bolt on ECM connector but cannot remove connector. Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 19, 2007, 5:37 AM
Post #2 of 13
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Re: 1993 Lincoln Towncar Won' Start
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Not sure what that year did for relays. If it has the box on driver's inner fender with the relays named on or in the cover the relays are all the same (check though) and you could use the A/C relay as a test. If the older unmarked type the relay for fuel pump has green on the connection. These relays have been a problem and your fuel pump may work for a test but not while cranking. In that it reacts to priming it I still think there is a fuel pressure problem while cranking that by your test didn't show up perhaps with key in just "run" position,
T
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smi889
Novice
Sep 19, 2007, 6:37 AM
Post #3 of 13
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Re: 1993 Lincoln Towncar Won' Start
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Tom thanks for the quick response! I have swapped the relays mentioned and I also have power to the injectors. Just don't seem to bet getting the ground return for them.
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Tom Greenleaf
Ultimate Carjunky
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Sep 19, 2007, 7:23 AM
Post #4 of 13
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Re: 1993 Lincoln Towncar Won' Start
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Ok: I'm guessing you are spraying starting fluid down intake which is a good test. If it had no spark that wouldn't do squat. For the moment I'm ruling out spark problems as the priming seems to work. This may be leading me in the wrong direction but is there a chance the fuel is messed up? If you have the pressure tester can you keep it running with starter fluid or small amounts of gas long enough to watch the fuel pressure? This should be the 4.6 engine and they are not known for a lot of problems that I know of.
How many miles are on this? I've seen them go with little trouble right over 200k. What possibly prevoked this problem? Recent work, new tank of gas - any clues there?
A jumped timing chain could do this but I have never known this engine to do that. Some other cooky things have been the reset in the trunk for the fuel pump. It's shuts off there if the car is in an accident but you would have no fuel pressure??
I've worked on a bunch of these but never had major engine problems. Seems like you have spark - good, you seem to have fuel pressure enough - good -- but are we sure it's fuel and not possibly water which I didn't think would pass thru the fuel filter but might.
Just a warning: Don't over crank this engine! That starter motor is a pill to replace!! Another thing that has happened a lot to these is the spark plug wires have a long hard insulater end that shorts out that plug and they run like crap but they still run. It's absurd to think enough of them went bad all at once to not run.
Another fault could be that excessive trying has flooded out the plugs. Hard to diagnose as when you test you get spark at the wire but the plug can't deal with being soaked and air drying alone won't fix that. Heat on each plug to glowing or just replace them if that's a possibility.
It would be nice to know what brought this on and whether you can get a spark at the plug wire at plug end to guess at what to do next. The EEC relay can shut this down too but you would have no spark.
We need some more observations right now,
T
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smi889
Novice
Sep 19, 2007, 8:19 AM
Post #5 of 13
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Re: 1993 Lincoln Towncar Won' Start
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Tom, nothing had been replaced before the problem, It has 80,000 miles on it, spark is going through the plug, the injectors have power but are not pulsing. I drove it home one Saturday with no problem. The next Saturday I went to go shopping and it cranked fine but would not start. Hasn't started since. I want to replace the ECM but I can't get the connector out. The retaing bolt spins but he connector won't budge.
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Tom Greenleaf
Ultimate Carjunky
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Sep 19, 2007, 10:41 AM
Post #6 of 13
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Re: 1993 Lincoln Towncar Won' Start
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Ah! No pulse - that explains it. Is that the ECM mounted on driver's side under hood near hinge? Been a while and the car was a 92 - totalled and had unplugged itself there. I thought it was just a sheet metal/lag bolt that held it??
Hmmm. There might be a hidden speed nut out of site that just spins behind it. See if you can pull hard on that while trying or sometimes air tools (air speeder) adapted down to 1/4 drive will scare things like that out. Same with the clip nuts used around cars.
I think that thing may need to be grounded by that bolt to work but don't recall right now.
____________________
I did a ton of stuff on location for a Livery company that bought a bunch of really nice totalled Town Cars for the onslaught of needed parts that get wrecked in hard use and needed parts 24/7. Those were fun days.
_________________________
Off Topic Warning with these: That child lock for back doors can get put half way between choices and door won't open from in or out no matter what you do but fuss with it for a loooong time as it's near impossible to take the door panel off with door closed. That was a real hoot when it happened to a limo version used for the usual weddings and stuff and they can't get out!! Use metal duct tape to secure those in the position you want to prevent that.
Let us know how you are making out,
T
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way2old
Veteran
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Sep 19, 2007, 5:32 PM
Post #7 of 13
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Re: 1993 Lincoln Towncar Won' Start
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The ECM connector might be real tight to remove. Go under the dash and remove the clip from the mounting bracket. Them slidwe the ECM toward the center of car and pull back to remove. This may give you enpough room to work the connector loose. The bolt does not come all the way out of the connector.
Being way2old is why I need help from younger minds
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Tom Greenleaf
Ultimate Carjunky
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Sep 20, 2007, 4:53 AM
Post #8 of 13
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Re: 1993 Lincoln Towncar Won' Start
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Thanks for jumping in on this Mr way2old! I was thinking of the wrong part for this car,
T
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way2old
Veteran
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Sep 20, 2007, 5:37 AM
Post #9 of 13
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Re: 1993 Lincoln Towncar Won' Start
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One other thing to check. Look under the right front bumper area and see if you can find any wires broken or corroded really bad. Ford is famous for the wires breaking at that point where they make an upturn to run over the radiator support. There may be a brown wire that is broken or possibly a small green one with a red or white stripe. Chased a lot of those down over the years.
Being way2old is why I need help from younger minds
(This post was edited by way2old on Sep 20, 2007, 5:38 AM)
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Master_Rick
New User
Sep 20, 2007, 8:45 AM
Post #10 of 13
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Re: 1993 Lincoln Towncar Won' Start
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I know this may be just way to easy,but did you think of the rollover switch in the trunk...it really only takes a good bump to trip it.kid on a bikre or moving something in the trunk. Anyway,It's just something I always check first,and since your car is 14 years old it might trip a little easier.
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smi889
Novice
Sep 26, 2007, 4:31 AM
Post #12 of 13
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Re: 1993 Lincoln Towncar Won' Start
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Waiting for a computer and connector!
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smi889
Novice
Oct 1, 2007, 4:19 PM
Post #13 of 13
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Re: 1993 Lincoln Towncar Won' Start
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Got the computer and connector. Connector was a real pain to get off. The retainer in the computer was spinning and and it finally broke out. Put them in today and the car is running. I'm never comfortable til I drive it awhile. Thanks all!
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