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    #1

    Vacuum Issues

    I know there is a vacuum section, but I have a few engine related questions as well. Also, I will research this question after I post this. Just in case somebody knows or has an answer anyway; does anybody know what this is?



    I has one on the Ranger, but I replaced it with a Tee-fitting and it has run fine since.

    Yesterday whilst grocery shopping, something popped on the car and it started running rough. No smoke, just runs choppy. The choppiness correlates to RPM; more RPM, more choppiness; but it smooths out a tiny bit. Rougher and slower at idle. It seems as if it's vacuum related. It was at the end of the day, so I didn't have the time to break out the gauges and diagnose it.

    It sort of mimics a bad fuel pump, except it starts easily; whereas when the fuel pump went bad, it took a lot of cranking to get it started.

    2nd Question: That vacuum tree/block; do they go bad or crack eventually? I have not messed with it or changed any of the lines going to and from it. They all duck down behind the engine and disappear. I know one goes to the brake booster. The other 4, no clue. I was hoping to trace them when the engine came out and weed out what I need and what I don't need. It would seem that this might happen before swapping engines.

    I will have more questions probably, this is all I got before I go into the service manual and RockAuto.

    Thank You

    Packman
    Tags: None
    #2
    These cars sometimes have more than one and it looks like a simple vacuum connector/check valve. They are available (Rockauto probably has it) so I'd check the lines and replace it


    "Hope and dignity are two things NO ONE can take away from you - you have to relinquish them on your own" Miamibob

    "NEVER trade your passion for glory"!! Sal "the Bard" (Dear Old Dad!)

    "Cars are for driving - PERIOD! I DON'T TEXT, TWEET OR TWERK!!!!"

    Comment

      #3
      Originally posted by packman View Post
      That vacuum tree/block; do they go bad or crack eventually?
      With it looking like a disc shape, I'm thinking it's a vacuum control valve. If so, it could eventually start to leak internally and not open / close all the way if it's going bad. AFAIK, it's probably a disc with a spring inside of it.

      Also, brake booster's a pretty big vacuum line to have a leak on.

      Wouldn't you idle increase with a vacuum leak though? Or wouldn't the vacuum leak have to be very bad for the car to run that poorly from it?
      ​

      '78 LTD | '87 Grand Marquis | '89 Crown Vic (RIP) | '91 Grand Marquis (RIP) | '94 Town Car (RIP) | '97 Town Car (RI)

      Comment

        #4
        Okay, it's a check valve. Now I know what that is. I will place an order for 2 since I never replaced the one on the Ranger.

        As for the Vacuum tree/block; it sits behind and below the check valve. I couldn't get a good shot as it was too dark for my phone to handle. That looks to be some sort of distribution block. It has 5 lines connected to it. I am wondering if they ever go bad or crack or sumtin like that.

        Vacuum issues and idle vary. When my MAP sensor was loosing it's line (it would randomly pop off because I lost the adapter fitting), it would idle rough, but it would belch black smoke. This problem is smoke-less. Just runs rough. I hope it's not the fuel pump; I just replaced that back in '09; unless they only last 6 years.

        Packman

        Comment

          #5
          looks like the check valve for the cruise servo.

          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

            #6
            Its a check tee. Check valve + tee all in one fitting. The check side of that should run down to the smog pump if memory serves. One side of the tee goes to the vacuum tree, the other side runs to the cruise servo. The idea is that the smog pump provides vacuum to the cruise servo under conditions of heavy engine load, like hill climbing, that would make it have low vacuum. In reality, its not very useful and in the nearly 10 years I've not had a smog pump I have never yet had trouble with the cruise not working properly.
            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

            Everything looks like voodoo if you don't understand how it works

            Comment

              #7
              Hmmmmm......sounds like it might not be my problem. Ugha! Smog pump is disabled. Somebody squeezed a small belt between it and the crank pulley. Because they ripped out the air conditioning and failed to replace it with a dummy pulley, that was the solution. Problem was when the belt started slipping I had to cut it off for removal; and I had no clue how to put it back on. I think my problem is elsewhere. I will start by changing the fuel filter (easy enough to do, but never the solution). Probably scan it too just to see what it says. I would be annoyed if it this weren't a 29 year old engine with nothing much more than routine maintenance done to it.

              Packman

              Comment

                #8
                Changed fuel filter this morning and cleaned the IAC along with the throttle body. Pretty much routine when I run into problems like this. I attempted to trace some of those vacuum lines. Discovered an old repair I made to the coffee can. THe line on it snapped a while back. I squeezed a small section of vacuum tubing over the severed portion and duct taped it. I don't know where that little vacuum line goes to; it just disappears under the wiper motor.

                So I ran the scanner and it gave me the usual EGR/EVP/EVR codes (replaced these long ago with no affect on the problem). I got codes 44 and 94, which is the Thermactor Air System. Isn't that the line that runs from the smog pump to the back of the head? Perhaps I need to remove that line and plug the head. Other than that, I will need to spend some time with the fuel pressure gauge and see if I am getting proper fuel pressure. And start tracing those vacuum lines. Probably should replace the engine like I should.

                Packman

                Comment

                  #9
                  that's the vacuum reservoir (soup can) for the AC. it should go back to the vacuum check T at the vacuum tree on the firewall behind the intake. The other line from that end of the check T should be the main feed line to the AC.

                  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

                    #10
                    Okay. Since I don't have A/C, I can eliminate that soup can, right? Or is that a vacuum source for some other part of the engine?

                    On my S-10, it was a plastic ball that broke; so I replaced it with a vacuum reservoir off of one of the old projects. That truck was built without A/C, so I guess that vacuum ball was important.

                    Packman

                    Comment

                      #11
                      no. it will shift where the air comes out every time you hit the gas without it. it will move from floor to defrost. If its an ATC car, it will also shift towards full hot. Leaks in the plumbing or a bad check valve will cause the same problem. The size and shape of the vacuum can is not terribly important, it just needs to have one.
                      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

                      Everything looks like voodoo if you don't understand how it works

                      Comment

                        #12
                        Hmmmm.......I guess I will trace that little line coming out of the soup can and see where it goes. Then buy a cheap vacuum reservoir and switch over.


                        Packman

                        Comment

                          #13
                          Also noticed this next to the soup can. Any ideas on what this does? It has a signal or power supply and vacuum lines going into it.



                          Packman

                          Comment

                            #14
                            That's the cruise control servo

                            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

                              #15
                              Thanks SLY. I was able to ID that over the weekend. One of the few things my Haynes manual recognizes. I know my cruise hasn't worked since shortly after purchasing the car. I'm not worried about it because it doesn't see the highway that much.

                              Packman

                              Comment

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