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Cruise control doesn’t work

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    #16
    Ok so I couldn’t get to the dump valve without burning my hand on the light bulb under the dash lol so I pulled the hose off the servo and pulled vacuum and it held. Next I pulled the hose off the check valve and check the valve and it was also good. Then I pulled a line off the servo and tested the servo itself and sure enough it would pull a vacuum then leak down within a minute. On a side note there is a missing line on the check valve, is it supposed to go to the air pump?







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      #17
      i want to say the 3 way check valve usually has engine vacuum and servo connection straight across from one another and the bottom out to the smog pump. I also seem to remember a standard 2 port one on the smog pump line. I shuffled things around on mine so the 2 port check valve is the only one in place. Just make sure if the engine side is pulling vacuum its actually getting to the servo.



      Which line off the servo were you getting leakage on? If its the one with the Y thing, thats the line to the dump valve, so make sure its the servo and not the valve. You should be able to apply vacuum to the servo and see the throttle open if its working at all.
      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

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        #18
        Is the line connected to the soup can?
        03 Marauder DPB, HS, 6disk, Organizer Mods> LED's in & Out, M&Z rear control arms, Oil deflector, U-Haul Trans Pan, Blue Fuzzy Dice
        02 SL500 Silver Arrow
        08 TC Signature Limited, HID's Mods>235/55-17 Z rated BFG G-Force Comp-2 A/S Plus, Addco 1" rear Sway, Posi Carrier, Compustar Remote Start, floor liners, trunk organizer, Two part Sun Visors, B&M Trans drain Plug, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17
        12 Escape Limited V6 AWD, 225/65R17 Vredestein Quatrac Pro, Winter 235/70-16 Conti Viking Contact7 Mods>Beamtech LED headlight bulbs, Husky floor liners

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          #19
          Cruise control doesn’t work

          I think the po of my car messed up the lines, the bottom of the tee goes to the vacuum tree then the top right goes to the servo. I believe that line was getting vacuum and I tested the check valve from there too. Also I tested the little line from the tee to the top of the servo and thats where it leaks, so basically where engine vacuum would enter the servo.

          Edit: I see what you’re saying so if I apply vacuum to where I did it should pull the linkage back too? It did not. It seems the black piece of plastic at the end where it attached to the throttle cable can move freely compared to the linkage if that makes sense.

          Also yes the line is connected to the soup can. I actually had to buy a soup can and line for it because someone deleted it at some point.

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          Last edited by 87GrandMarq; 03-30-2020, 05:23 PM.

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            #20
            Pro tip when working inside car for long time..pull the door plunger out and unplug it. You wont burn your hands on any lights or drain your battery down to nothing.

            Also:





            Page 123 only tells you the vacuum supplied to the speed control is coming from the firewall mounted manifold through a black and brown vacuum line.
            Attached Files
            Last edited by 87gtVIC; 03-30-2020, 05:37 PM.
            ~David~

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

            Originally posted by ootdega
            My life is a long series of "nevermind" and "I guess not."

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

            Originally posted by gadget73
            my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.




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              #21
              The T check valve is set up properly. The plugged side is to the smog pump. I remember dealing with that on my 88 very clearly.

              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.

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                #22
                Thank you guys I’ll have to look into it a little deeper.


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