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    #1

    LTC Check Engine emergency!!!

    Good Morning all.

    I just came into work today and on the way in my check engine light went on about 11 times. came on for like 2-3 seconds, then went away. 2 of those times, it went on and off in 1-2 seconds increments for about 2-3 times. One thing I had noticed is the idle fluctuated when the check engine light turned on and off. When my commute was in town (towards the latter part of my trip), I noticed the idle was racing, but when the light went on, the idle went back to normal. I had not noticed this, or at least it didn't get worse until I was near work. The only reason I knew it was racing was because I popped it in neutral and the idle was racing.

    Thank God I made it to work ok, but now I am really worried. My commute is 75 miles one way and I am really not looking forward to go home!

    I have a 1989 Lincoln Town car with 135k on the clock. Changed the Plugs, cap, rotor, fuel filter, pcv.

    She had stalling issues before that was was cleared up because one of the clasps to the distributor was loose.

    Any help would be appreciated! I don't have any readers or tools on me.
    "To Find yourself, you must first lose yourself"

    -1973 Volkswagen Bus Westy
    -1986 Honda Magna 700cc
    -1989 Lincoln Town car Signature Series
    -2011 Subaru Outback
    Tags: None
    #2
    May be a bad IAC, when mine went bad the engine was idling high. Unplug the electrical connector to the IAC and if the idle goes down then the IAC is the likely culprit.
    No tools required for reading codes, just a paper clip or jumper wire.

    I stole this link from miamibob's post in another thread:
    http://www.troublecodes.net/ford/
    The bottom picture with just the jumper wire should allow you to read codes by counting the CEL blinks, IIRC.
    Vic

    ~ 1989 MGM LS Colony Park - Large Marge
    ~ 1998 MGM LS - new DD
    ~ 1991 MGM LS "The Scab"
    ~ 1991 MGM GS "The Ice Car"

    Comment

      #3
      What an IAC? Where is it located? Can I unplug it and be fine to drive home or do I need it plugged in?? Fortunately I have paperclips in the office.

      I can't find anything that talks about doing this on the link you gave me. Nothing for the Ford 5.0??? It just mentioned the continental, Villager, etc.

      And which codes pertain to our cars?
      Thanks
      "To Find yourself, you must first lose yourself"

      -1973 Volkswagen Bus Westy
      -1986 Honda Magna 700cc
      -1989 Lincoln Town car Signature Series
      -2011 Subaru Outback

      Comment

        #4
        IAC is on the rear side of the throttle body:
        http://www.grandmarq.net/vb/showthre...l=1#post363913

        I'm not sure about driving with the IAC unplugged, I'm afraid I'm not knowledgeable enough to answer that one, when mine went bad I just threw the one that was in the trunk on... I have a lot of junk in the trunk...

        All the 2 digit EEC-IV stuff applies to our cars from that code list link.
        Pic of how to jumper the connectors to read codes using the CEL.
        http://i94.photobucket.com/albums/l9...r/00ea6bfe.jpg

        More info from others more knowledgeable:
        http://www.grandmarq.net/vb/showthre...O-Engine-Light
        Last edited by VicCrownVic; 04-08-2014, 11:00 AM.
        Vic

        ~ 1989 MGM LS Colony Park - Large Marge
        ~ 1998 MGM LS - new DD
        ~ 1991 MGM LS "The Scab"
        ~ 1991 MGM GS "The Ice Car"

        Comment

          #5
          Where is the All the 2 digit EEC-IV stuff plug. The pic shows that it is by the dipstick
          "To Find yourself, you must first lose yourself"

          -1973 Volkswagen Bus Westy
          -1986 Honda Magna 700cc
          -1989 Lincoln Town car Signature Series
          -2011 Subaru Outback

          Comment

            #6
            That pic is from a different vehicle (a van I think), yours should be under the hood on the driver side fender and will look exactly like the one in the pic.

            Another link with some info on the paperclip/jumper wire code reading:
            http://www.grandmarq.net/vb/showthre...l=1#post503112
            Vic

            ~ 1989 MGM LS Colony Park - Large Marge
            ~ 1998 MGM LS - new DD
            ~ 1991 MGM LS "The Scab"
            ~ 1991 MGM GS "The Ice Car"

            Comment

              #7
              Ok, I identified the plug, I jumped it and started counting.

              It blinkedabout a second later another blink.4-6 seconds later it blinked ....a second later another blink

              6 second slater there was another blink

              then 6 seconds after that....there was a quick five blinks followed by a few seconds followed by another three blinks.

              To my understanding, it pulled two codes (the blink in the middle was just a spacer I think??? I hope?!?!

              so the codes are 2-2, and 5-3

              2-2 means- MAP (vacuum)or Baro signal out of range - MAP

              5-3 means - Throttle position sensor too high

              How I interpret it

              Before I go on I want to mention that my crescent valve was broken So i plugged the one line that sucks and left the other one loose. They are both hanging on the steering column.

              No clue about the MAP code 2-2, but the 5-3 code means that I have a bad TPS...or that I need to adjust it????? This true?
              "To Find yourself, you must first lose yourself"

              -1973 Volkswagen Bus Westy
              -1986 Honda Magna 700cc
              -1989 Lincoln Town car Signature Series
              -2011 Subaru Outback

              Comment

                #8
                Codes 22 and 53, based on what you described seeing as far as blinking light, seems like you interpreted the blinks properly.
                So the codes seem to indicate that the problem is probably not the IAC.

                I don't think there is any adjustment for the TPS. If you can test when you get home it sounds like you should see a voltage reading higher than what is acceptable if I understand the meaning of the 53 code correctly. In that case I believe replacement would be the fix, someone can correct me if I'm wrong.

                Video I found on youtube for TPS testing:


                As for the MAP sensor, code 22, I'm not too sure on that one either. IIRC, I have been told that if the MAP is good you can pull the vacuum hose off of it and the car should die.
                Vic

                ~ 1989 MGM LS Colony Park - Large Marge
                ~ 1998 MGM LS - new DD
                ~ 1991 MGM LS "The Scab"
                ~ 1991 MGM GS "The Ice Car"

                Comment

                  #9
                  How exactly would one clean the IAC and EGR?? Where would you clean it??
                  "To Find yourself, you must first lose yourself"

                  -1973 Volkswagen Bus Westy
                  -1986 Honda Magna 700cc
                  -1989 Lincoln Town car Signature Series
                  -2011 Subaru Outback

                  Comment

                    #10
                    Unbolt and clean the openings (and as much internally as you can) with carb cleaner, but I'm not sure if it would really help in this case since the codes are pointing to the MAP sensor and TPS.
                    I usually spray some in, then cover the holes with my hand and give it a good shake and if I can find an old toothbrush or something try to get as much carbon build up that I can reach off. Things can get pretty mess doing it like that though, I'm not sure if other have a better way or not.

                    IAC:
                    http://www.2carpros.com/forum/automo...lve_ford_9.jpg

                    EGR:
                    http://www.explorerforum.com/forums/...1&d=1257792851
                    Last edited by VicCrownVic; 04-08-2014, 03:57 PM.
                    Vic

                    ~ 1989 MGM LS Colony Park - Large Marge
                    ~ 1998 MGM LS - new DD
                    ~ 1991 MGM LS "The Scab"
                    ~ 1991 MGM GS "The Ice Car"

                    Comment

                      #11
                      Also, is there a way to detach/install the TPS, i think I remember messing with that and I screwed something up. Or is it just bolt on?
                      "To Find yourself, you must first lose yourself"

                      -1973 Volkswagen Bus Westy
                      -1986 Honda Magna 700cc
                      -1989 Lincoln Town car Signature Series
                      -2011 Subaru Outback

                      Comment

                        #12
                        it's just bolt on, though it may have security torx screws (star drive with the stupid pin in the middle).

                        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)

                        Originally posted by gadget73
                        ... and it should all work like magic and unicorns and stuff.

                        Originally posted by dmccaig
                        Overhead, some poor bastards are flying in airplanes.

                        Comment

                          #13
                          I believe they are held in place by phillips head screws (TPS to Throttle body) What I actually mean is, is the TPS bonded or connected to a spring or some sort to the throttle body? Or does it just mounts up without any additional placements, as you say?
                          "To Find yourself, you must first lose yourself"

                          -1973 Volkswagen Bus Westy
                          -1986 Honda Magna 700cc
                          -1989 Lincoln Town car Signature Series
                          -2011 Subaru Outback

                          Comment

                            #14
                            Careful so you don't strip the screws. If they've never been out, they might put up a fight.
                            1990 MGM: $50 E7 heads, HO cam, Holley SysteMAX lower intake, HO upper intake with an Explorer TB. LSC ECM. Lincoln logs into stock dual exhaust. K&N drop in air filter. Wide ratio AOD, 2400 converter with a 3.08 one tire fire out back. Car is less slow now. Then there's the '92 Beater. Dual 2.25" exhaust with shiny tips. Rumbles nice. Super slow. Burns oil too.

                            Comment

                              #15
                              Thank you !!

                              And BTW, The video was very helpful!
                              "To Find yourself, you must first lose yourself"

                              -1973 Volkswagen Bus Westy
                              -1986 Honda Magna 700cc
                              -1989 Lincoln Town car Signature Series
                              -2011 Subaru Outback

                              Comment

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