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VSS and Fuel Pump wiring for MAF

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    #1

    VSS and Fuel Pump wiring for MAF

    Hey all! I'm upgrading the wagon to MAF system. In the process of doing this I have learned that I need to hook up wires from the VSS and Fuel Pump Monitor to the new MAF computer.

    So all the directions I've found appear to be for a Mustang. Since our wire colors are different I'm hoping somebody can help me out with wire colors for our rides. I have a 1986 Country Squire.

    Vehicle Speed Sensor Instructions:
    1. Hook orange / yellow wire to pin 6.
    2. Hook dark green / white wire to pin 3.
    I have a dark green / white wire and a black wire going to my VSS. Safe to assume that I should run the green / white wire to pin 3 and the black wire to pin 6?

    Fuel pump monitor:
    1. Hook pink / black wire on fuel pump relay to pin 19. This should be the fuel pump hot wire.
    I don't see a pink / black wire on my fuel pump relay. Battery is out of the car and instead of hooking it back up and getting out the voltmeter I was hoping somebody could help me out and let me know which color wire applies in our application.

    Thanks for the assistance!
    JD
    1986 Ford Contry Squire: HO engine swap, 3G alternator, 3.73 gears, rear air springs, Class III 8000 lb hitch... potential tow rig for my Blazer trail toy??
    Tags: None
    #2
    should be the yellow and orange wire on the fuel pump relay.

    Green wire on the VSS sounds correct, but I dont remember doing that on my conversion.
    2003 Town Car Signature - 3.27 RAR, Dual exhaust and J-mod - SOLD 9/2011
    89 Crown Victoria LX HPP -- SOLD 9/2010
    88 Grand Marquis LS - The Original -- Totaled 5/2006

    I rebuild AOD/AODE/4R70W/4R75E transmissions....Check out my Facebook page: https://www.facebook.com/pages/North...48414635312478

    Comment

      #3
      Thanks for the reply on the fuel pump relay. I'm at work now so can't go make sure I've got a yellow / orange wire but hoping it jumps out at me when I get home. The fuel pump relay is the green relay correct?

      Unfortunately now that I've got the old computer out and wiring apart I can't confirm the fuel pump wire with a voltmeter cause the relay will never kick on.

      I'm sure I'll have more questions as I progress. Wiring isn't my strong suit and I'm nervous as hell trying to get that old computer connection apart to add more pins. Prying and old plastic and me never seem to mix well.
      1986 Ford Contry Squire: HO engine swap, 3G alternator, 3.73 gears, rear air springs, Class III 8000 lb hitch... potential tow rig for my Blazer trail toy??

      Comment

        #4
        Quick additional question while I'm thinking about it. Will it be completely obvious what I need to pry on to open up the existing computer harness? Right now I've lifted up the little thin plastic blue cover on teh back that looks like a dust shield. And it has cracked. I assume this can just be removed since it doesn't have openings in it for the new pins anyhow.

        What exactly is the "lock" in the harness. I see orange plastic within the gray plastic on both sides of the connector. Does that all come out as 1 assembly or just one side of it? Should I be prying on it down where the harness plugs into the computer or on the backside where the backs of the wires are.

        This may not make any sense, once I'm home and can see it I'll try and clarify it. Thanks for any help.
        1986 Ford Contry Squire: HO engine swap, 3G alternator, 3.73 gears, rear air springs, Class III 8000 lb hitch... potential tow rig for my Blazer trail toy??

        Comment

          #5
          green/white vss wire to pin 3, black vss wire to pin 6.

          Fuel pump wire you need is the orange one coming off the relay. Should go to pin 19 on the ECM.

          wire colors are from the 86 EVTM, and they are a little different than other years.

          Connector comes apart pretty easy, but this might help: http://fordfuelinjection.com/?p=74
          Last edited by gadget73; 03-11-2010, 08:16 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 grandpa spec white and cranberry

          1984 Lincoln Continental TurboDiesel - rolls coal

          Originally posted by phayzer5
          I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

          Comment

            #6
            Besides the stalling issue with a manual trans, do those two output signals provide better engine management or somthing like that?

            Just wondering, because it sounds like it would if the ECM needs to monitor the fuel and speed.

            Comment

              #7
              the fuel relay thing does nothing overly useful. It just makes it not set a code about secondary fuel system failure. It sees either 12v with the fuel pump relay closed, or 0v. All it could possibly tell you is if the fuel pump relay failed, but you'd probably figure that out by the fact the motor won't start.

              The VSS is used partially for EGR function. Without VSS input, it opens egr just off idle, which makes it stumble a bit. It works without it, but the off-idle bog gets annoying. All the 88+ ECMs in Panthers have VSS wiring to them already because the ECM is also the cruise control computer, in addition to being used for egr functions. 87 and older had stand-alone cruise control without VSS signals. Mustangs never had integrated cruise control, but they had VSS input.
              Last edited by gadget73; 03-12-2010, 12:21 AM.
              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 grandpa spec white and cranberry

              1984 Lincoln Continental TurboDiesel - rolls coal

              Originally posted by phayzer5
              I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

              Comment

                #8
                I was logging in to update what I had found out last night with the wiring and a volt meter but Gadget already has all the good stuff in here! Thanks Gadget!

                I can confirm all of the colors and pin numbers he stated above are correct for a 1986. Also I did get the computer wiring harness apart but that link would have made me a lot more comfortable before I tried it. Definately a little pucker factor as I knew if I broke it i'd be in for a painful repair session.

                Thanks again to for your help and all the knowledge on this board. I'll post up again if I run into additional roadblocks.
                JD
                1986 Ford Contry Squire: HO engine swap, 3G alternator, 3.73 gears, rear air springs, Class III 8000 lb hitch... potential tow rig for my Blazer trail toy??

                Comment

                  #9
                  Cool. So does it run yet? I actually picked up a complete spare harness when I did my car, just in case I screwed it up. I laid the new harness in and plugged it all up. Had it running with the ecm harness draped over the fenders. I drove around for a good month with the stock harness and SD ECM in the trunk just in case.
                  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 grandpa spec white and cranberry

                  1984 Lincoln Continental TurboDiesel - rolls coal

                  Originally posted by phayzer5
                  I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                  Comment

                    #10
                    Not running yet... 2 kids under 2 years old, work, honey-do lists... don't get as much time on it as I'd like. I haven't made any more progress since last night...
                    1986 Ford Contry Squire: HO engine swap, 3G alternator, 3.73 gears, rear air springs, Class III 8000 lb hitch... potential tow rig for my Blazer trail toy??

                    Comment

                      #11
                      Gotcha. I don't even have those reasons and I've been driving with the fuel pump wire hanging there for almost a year now. It would take me like 20 minutes to tie it in, but no, its just hanging there.
                      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 grandpa spec white and cranberry

                      1984 Lincoln Continental TurboDiesel - rolls coal

                      Originally posted by phayzer5
                      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                      Comment

                        #12
                        Upgrade completed! Thanks again for the input.

                        Actually all went together fairly easily... Just took a little time. I can't believe how smooth the thing idles now. Overall I'm very happy with the upgrade. Waiting to see if any fuel mileage improvement comes along as well, but no more pinging under load or rough idle.

                        Based on the improvements from the MAF conversion it definately looks like I was outside the bounds of the speed density system. Who knew!

                        Now to get the timing back up to spec (i had it back down to 6 degrees with the speed density system and STILL had pinging).

                        Also, did a home-made intake system with Cone style filter at the end of it. Now that's all I hear. I forgot how loud an low restriction intake system like that is. Sheesh!
                        1986 Ford Contry Squire: HO engine swap, 3G alternator, 3.73 gears, rear air springs, Class III 8000 lb hitch... potential tow rig for my Blazer trail toy??

                        Comment

                          #13
                          yeah I was having those problems myself. It dynoed really lean, poor fuel economy, pinging problems, etc. Drivability was OK, but it just felt like it wasn't performing properly. Its definitely better with the mass air, super smooth idle, no more detonation problems, no more hesitation, and a little bit better fuel mileage.
                          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 grandpa spec white and cranberry

                          1984 Lincoln Continental TurboDiesel - rolls coal

                          Originally posted by phayzer5
                          I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                          Comment

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