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removing plenum off '89 302

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    #1

    removing plenum off '89 302

    Just a quick question,

    I want to change the passenger valve cover (posted this a few weeks ago) and I was told I have to remove the plenum (the curved thing, intake, or whatever its called). Before doing so, is the plenum filled with coolant? I see there's a soft plug in it...but I wasn't sure if there would be coolant since coolant (in my opinion) has no business in the plenum (no need for a water X-over there since it doesn't tie the cylinder heads together).

    But, I have been wrong in the past. And while we're on this subject, can someone please explain why there are 2 coolant lines (3/8") running to the throttle body? I thought they were VAC lines until I found a wonderful green surprise upon their removal... Why on earth would you ever want to heat up the air/fuel mixture with coolant lines?

    Thanks!
    Tags: None
    #2
    Those coolant lines go to the EGR spacer. They are cooling the spacer, not heating the air up. Coolant flows in, through the spacer and then right out the other line. Coolant does not flow through the upper intake. Only the lower intake is "wet".
    Last edited by Mercracer; 10-13-2010, 09:53 AM.

    Comment

      #3
      Interesting about the EGR.

      That's what I figured concerning the upper intake. The freeze plug must be there for casting purposes.

      One more thing...any there any "common" problems with taking the upper intake off? I don't mind surprises, but would prefer without.

      Comment

        #4
        Originally posted by formulabird428 View Post
        Interesting about the EGR.

        That's what I figured concerning the upper intake. The freeze plug must be there for casting purposes.

        One more thing...any there any "common" problems with taking the upper intake off? I don't mind surprises, but would prefer without.
        Old vacuum hoses like to break. Be sure to have them all disconnected and have all of them reconnected and snuggly attached or you'll have vacuum leaks. While you got it all apart clean the intake and the throttle body and the iac. Just as preventative maintainence.

        Comment

          #5
          I have worked on more foxes than panthers. I don't recall if the boxes have them, there may be an "anti shake" brace on the rear of the plenum. It must be removed, then there is another stud under it. Total of 6 fasteners to hold plenum to lower intake. There are 2 hiding under the 5.0 plate...
          Last edited by mitymerc; 10-13-2010, 11:26 AM. Reason: typo



          87 Ford LTD Crown Victoria Country Squire Station Wagon. 4.10's, Repacked Trac Loc, Boxed LCA's, Explorer Intake, 65mm T-body, 'Stang Cam, 'Stang Air tube, K&N, GT-40X Heads, 1" Spacer, 1 5/8 BBK's, 2.5" Pypes X-pipe w/high flow cats, Single Chamber Thunderbolts, B&M 'vertor, Po-lice Swaybars.

          91 Mercury Grand Marquis Colony Park Station Wagon. K-Code, 4.10's, Repacked Trac Loc, MK VII LSC Engine, 'Stang Upper Intake, Stang Air Tube, K&N, 65 mm T-Body, 'Stang Headers, 'Stang Cat Pipe,'Stang Torque Convertor, 2 Chamber Thunderbolts.

          Comment

            #6
            Originally posted by 86VickyLX View Post
            Old vacuum hoses like to break. Be sure to have them all disconnected and have all of them reconnected and snuggly attached or you'll have vacuum leaks. While you got it all apart clean the intake and the throttle body and the iac. Just as preventative maintainence.
            I'll probably just replace the vacuum hoses to ensure they never break or crack in the near future.

            Originally posted by mitymerc View Post
            I have worked on more foxes than panthers. I don't recall if the boxes have them, there may be an "anti shake" brace on the rear of the plenum. It must be removed, then there is another stud under it. Total of 6 fasteners to hold plenum. To lower intake. There are 2 hiding under the 5.0 plate...
            Very good. I imagine I would have wasted about an hour trying to find those 2 bolts under the 5.0 cover too.

            Comment

              #7
              replace the PCV stuff while you've got the upper intake off, it's nearly impossible with the intake still on. It's all located in the lower part of the manifold - pcv valve, pcv grommet, and pcv breather screen (in order of removal, the valve sits inside the grommet and the breather screen is underneath)


              the tiny vacuum hoses running to the solenoids on the upper intake are rotten cocksuckers. they break with the slightest amount of misplaced force, be really careful
              sigpic


              - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

              - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

              - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

              Comment

                #8
                Originally posted by mitymerc View Post
                "anti shake" brace on the rear of the plenum.
                Is that what that is for? Boxes don't have them, but I've seen them on Mark VIIs. I always tossed it out.
                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

                  #9
                  Originally posted by gadget73 View Post
                  Is that what that is for? Boxes don't have them, but I've seen them on Mark VIIs. I always tossed it out.
                  anyone got pics?
                  sigpic


                  - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

                  - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

                  - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

                  Comment

                    #10
                    its a U shaped steel bracket that goes from one of the rearmost upper intake bolts to one of the rearmost lower intake bolts. You have to pull the nuts off the studs, remove the bracket, then remove the bolt.
                    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

                      #11
                      Originally posted by gadget73 View Post
                      its a U shaped steel bracket that goes from one of the rearmost upper intake bolts to one of the rearmost lower intake bolts. You have to pull the nuts off the studs, remove the bracket, then remove the bolt.
                      What's the point?

                      Comment

                        #12
                        I have absolutely no idea. I secretly suspect it exists so people go "wtf is this?"
                        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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