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90 lincoln town car map sensor


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caseystorie
Novice

May 23, 2014, 3:49 PM

Post #1 of 20 (2754 views)
90 lincoln town car map sensor Sign In

I have a 1990 Lincoln Town Car with the 5.0 that has about 153000 miles on it. A couple of years ago the car was surging and dieing while driving it, i took it to a shop and they fixed it,it was a vacuum leek under the upper plenum that went to the map sensor. The next summer it started doing it again so i took it to a different shop and all he did was get into the ecm and mess around,averaging certain things if im not mistaken like the tps and map sensors,i dont know nothing about that stuff its just what he told me i think,anyway over the winter i ran somewhat better getting 10mpg c&h but the car never got up hot enough for the heater to work and the gas gauge goes crazy now up and down all the time and it started surging again,so i took off the upper manifold found out it didnt have a gasket and the map sensor was capped off so i put on a new gasket and ran the vacuum line to a new map sensor,and it runs great now(15mpg city) except it revvs up high on start up and idle back ok and it dies at stop signs.ive tested the voltage at the tps i was getting the correct readings before i took it to the shop now im not its reading 5.25 with the throttle closed,and the new map is reading 2.89 constant it dont matter if you vacuum pump it or not,the one that i took off a motorcraft reads 2.75. so stupid me i have my wife run it down to same shop as last time for the dieing at stop signs he said it your map sensor but adjusted the tps i think cause now it wants to pull a little while stopped with the brake on,but know i have three maps that all read the same or close to reading 2.89 & all but one is new.the service engine light tends to go off while driving till you idle down then it comes back on.whats going on??and also the gas gauge never acted like this till i took it there.i hope this made since cause it dont for me no more.so basically what happened i think was the first shop capped the map off,the second one did something in the ecm,then i fixed the real problem and then the second shop fixed the tps and tried to get her for $200 to put on a new map and that included the diagnosis ,she left only paying $90,i went and got a map but all three read the same??


Hammer Time
Ultimate Carjunky / Moderator
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May 23, 2014, 10:24 PM

Post #2 of 20 (2732 views)
Re: 90 lincoln town car map sensor Sign In

What codes are being set in the computer?



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Discretesignals
Ultimate Carjunky / Moderator
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May 24, 2014, 6:56 AM

Post #3 of 20 (2718 views)
Re: 90 lincoln town car map sensor Sign In

Did they do a MAP to MAF conversion on this?





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caseystorie
Novice

May 24, 2014, 11:28 AM

Post #4 of 20 (2713 views)
Re: 90 lincoln town car map sensor Sign In

i just got the codes off it, the key on engine off codes are 11 and 22, the key on engine running codes are 21,44, 74.i have the air ride switch off due to it wanting to run almost all the time,the car dont sag though. im sorry i didnt let the car warm up i forgot and the 74 i did hit the brake


(This post was edited by caseystorie on May 24, 2014, 11:33 AM)


caseystorie
Novice

May 24, 2014, 11:30 AM

Post #5 of 20 (2711 views)
Re: 90 lincoln town car map sensor Sign In

 MAP to MAF conversion on this? no idea if they did it wasnt brought up that i know of .it that why the vacuum line to the the map was plugged off but the wiring was still hooked up?and if it has the MAF is it the thing right after the intake filter box


(This post was edited by caseystorie on May 24, 2014, 12:10 PM)


Hammer Time
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May 24, 2014, 11:41 AM

Post #6 of 20 (2708 views)
Re: 90 lincoln town car map sensor Sign In

That doesn't make a ton of sense because 1 means system pass. 21 is a problem with the coolant temp circuit and 22 is a problem with the MAP sensor circuit. That doesn't automatically mean the sensor is the issue. It could be anything in the circuit. I don'ty know if that year has a data stream but that would be the first thing to look at before manually testing each circuit. The 44 is an air pump issue and the 74 just means you never energized the brake light switch during the test or there is a problem with the switch circuit.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on May 24, 2014, 11:42 AM)


caseystorie
Novice

May 24, 2014, 12:20 PM

Post #7 of 20 (2705 views)
Re: 90 lincoln town car map sensor Sign In

it does have a mass air flow on it , did this car not have it stock? it looks stock even the wires on the harness, thats probably why the vacuum line running to the map was plugged, so should i remove the vacuum and plug it back off like it was when i got it,and not worry bout the 22 code?? cause the car is running great now


(This post was edited by caseystorie on May 24, 2014, 12:35 PM)


Hammer Time
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May 24, 2014, 12:38 PM

Post #8 of 20 (2701 views)
Re: 90 lincoln town car map sensor Sign In

Why would you do that. The car is equipped with a MAP sensor, it needs to work. The coolant temp sensor is just as important as the MAP or MAF.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



caseystorie
Novice

May 24, 2014, 1:01 PM

Post #9 of 20 (2697 views)
Re: 90 lincoln town car map sensor Sign In

the first codes i got before i did anything was 11,22 53 63 87 91 44,.i then fixed the vacuum leek and put the new map on and a gasket inbetween the bottom and upper intake,then i got the codes 11 22 53 44 98,i took it to the shop the fixed the idle and said map sensor was bad,today i didnt warm up the car first and didnt hit the brake and the air ride was turned off and got the 11 22 21 44 74


Hammer Time
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May 24, 2014, 1:03 PM

Post #10 of 20 (2695 views)
Re: 90 lincoln town car map sensor Sign In

You're still getting MAP sensor and CTS codes so you still have a problem in the circuit.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



caseystorie
Novice

May 24, 2014, 2:37 PM

Post #11 of 20 (2693 views)
Re: 90 lincoln town car map sensor Sign In

data stream that mustve been what the shop was into i mustve overlooked that earlier yes im still getting the map codes,but the three maps i have all read the same. i probe the middle wire and hook up my volt meter and hook up the vacuum pump and all three read from 2.90 -2.75 with no vacuum applied and it dont matter if i apply any or not. i assume im doing it right. maybe not?before i took it to the shop that did something inside the ecm, i used to be able to get the correct reading on the tps(i think it was just below 1 volt), now it says 5.25 with the throttle closed or open or anywhere in between.but i have tested it yet since this visit to the shop when they fixed the dieing at stop signs and the high revving(2000+/-400) at startup.know it dont die and the revving is down to where it should be at start,the heater now works,seems like the passing gear is alot better..the car has a mass air on it, is that a conversion or did the 90 town cars have that?


(This post was edited by caseystorie on May 24, 2014, 2:41 PM)


Hammer Time
Ultimate Carjunky / Moderator
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May 24, 2014, 2:40 PM

Post #12 of 20 (2691 views)
Re: 90 lincoln town car map sensor Sign In

I already told you that just because you have a MAP code doesn't mean the sensor is causing it. There is a problem elsewhere in the circuit that needs to be found.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



caseystorie
Novice

May 24, 2014, 2:42 PM

Post #13 of 20 (2689 views)
Re: 90 lincoln town car map sensor Sign In

ok sorry


Hammer Time
Ultimate Carjunky / Moderator
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May 24, 2014, 2:48 PM

Post #14 of 20 (2687 views)
Re: 90 lincoln town car map sensor Sign In



















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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



caseystorie
Novice

May 24, 2014, 3:12 PM

Post #15 of 20 (2685 views)
Re: 90 lincoln town car map sensor Sign In

dude i cant thank ya enough,thanks ,im off the next two days so ill get to it and see what i can find


Discretesignals
Ultimate Carjunky / Moderator
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May 25, 2014, 1:52 PM

Post #16 of 20 (2653 views)
Re: 90 lincoln town car map sensor Sign In

MAP to MAF conversion was a popular thing back then for performance enthusiasts on the 5.0L. It involved buying the MAF sensor conversion kit.

To make it work you had to add an extra harness, pin the ECA connector and change the ECA to one that was used in a MAF sensor vehicle.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


caseystorie
Novice

May 25, 2014, 2:47 PM

Post #17 of 20 (2650 views)
Re: 90 lincoln town car map sensor Sign In

the car does have a mass air flow on it,so where does this leave me,just ignore the 22 code,or what? i plan doing that checklist tomorrow,but if the car didnt come with the maf,im kinda stumped on what and if i should do anything,it kinda makes me wonder if the shop knew it had the conversion in the first place


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 25, 2014, 3:32 PM

Post #18 of 20 (2646 views)
Re: 90 lincoln town car map sensor Sign In

No, this car came with both sensors and they both have to be operational. This is not an add on here.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

May 27, 2014, 12:19 AM

Post #19 of 20 (2628 views)
Re: 90 lincoln town car map sensor Sign In

Not all Town cars that year came with a MAF sensors. We have a regular customer that comes in for repairs that drives one of those and it doesn't have a MAF. I believe that some of the Town cars with California emissions came with a MAF sensor, but if this vehicle isn't California emissions, it was converted.

Why else would the MAP be capped?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 27, 2014, 12:28 AM

Post #20 of 20 (2626 views)
Re: 90 lincoln town car map sensor Sign In


Quote
Why else would the MAP be capped?


What good would it do to cap it if it's still live and an active part of the programming?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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