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“While You’re There” Intake Plenum Checklist

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    “While You’re There” Intake Plenum Checklist

    Taking the intake plenum out for smg relocation and going to gather a list of things to do while its out. So far I have:

    - clean ICV
    - clean TBs
    - coolant sensor near thermostat (is this accessible?)
    - rear TPS
    - installing oil pressure gauge (i want this for data logging dash)

    Any other wear/tear items I should consider?

    tia

    #2
    Coolant sensor is accessible, you could consider replacing the starter if it's old and not been done, the 2 coolant hoses that run over it gets really in the way, but if you're also swapping the coolant temp sensor then I'm guessing you're also draining at least some coolant, so you could remove those two hoses to ease removal of the starter.

    Also, you could replace the sensor on the TP actuator motor too whilst you're there. All this adds to the cost though.

    Regards

    Edit to see you already mentioned the TP sensor

    Comment


      #3
      Intake cam position sensor?

      Not sure how much it's worth doing though. Kinda expensive and if you're doing the work yourself, getting to the sensor in the future is just another ~20 min of removing/reinstalling the airbox.
      2002 Topasblau M3 - Coupe - 6MT - Karbonius CSL Airbox - MSS54HP Conversion - Kassel MAP - SSV1 - HJS - PCS Tune - Beisan - MK60 Swap - ZCP Rack - Nogaros - AutoSolutions - 996 Brembos - Slon - CMP - VinceBar - Koni - Eibach - BlueBus - Journal

      2012 Alpinweiss 128i - Coupe - 6AT - Slicktop - Manual Seats - Daily - Journal

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        #4
        The intake cam sensor is a fiddle, especially when attempting to accurately route the replacement sub harness...
        ...So how about injector 'o' ring refreshment?
        You know...while you're in there.

        Bloody cars.
        I had to replace a worn out clutch pivot pin on my 328iS last week.
        while I was in there for a $3.00 part ended up circa $400.
        Last edited by FBloggs; 05-18-2022, 12:18 AM.

        Comment


          #5
          Ping sensors?

          I replaced all 3 of mine when I did motor-out work. No clue if it's a common or uncommon failure point but became a might as well. I actually replaced all motor related sensors, but the entire motor was out so slightly different.
          Build thread: Topaz Blue to Shark Blue

          Comment


            #6
            Maybe some alternator work or at least a front belt bearing/pulley swap

            Comment


              #7
              Do any of the coolant "pipes" that run under the plenum (or their o-rings) have any issues? I haven't heard, but wondering. I'm thinking of #7 and 10:


              Click image for larger version

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                #8
                what mileage and is the starter original? maybe consider replacing while the intake mani is out.

                Comment


                  #9
                  Originally posted by antknee View Post
                  what mileage and is the starter original? maybe consider replacing while the intake mani is out.
                  90k miles. I’m like the 4th owner so no clue if its still original or not.

                  Comment


                    #10
                    Originally posted by elbert View Post
                    Do any of the coolant "pipes" that run under the plenum (or their o-rings) have any issues? I haven't heard, but wondering. I'm thinking of #7 and 10:


                    Click image for larger version

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                    Good call will inspect those for leaks!

                    Comment


                      #11
                      Any tips for cleaning out the plenum without a giant hot tank? Trumpets on 1 and 6 seem really hard to get to with a rag.

                      Comment


                        #12
                        Originally posted by eacmen View Post
                        Any tips for cleaning out the plenum without a giant hot tank? Trumpets on 1 and 6 seem really hard to get to with a rag.
                        I think NZ_M3 said to just spray some simple green, let it soak then rinse out the airbox.

                        The plenum is so easy to remove that I really wouldn't replace anything under there.

                        Comment


                          #13
                          You might consider hoses 5 and 3 on the diagram. These are the hoses from the coolant pipes to the heater core. On mine the O-Ring from hose 5 to the long coolant pipe was leaking at 105k miles.

                          Click image for larger version

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                            #14
                            Hey eacmen - I started a similar thread not that long ago. Some good ideas here:

                            I've got my car totally stripped down (https://nam3forum.com/forums/forum/main-forum/member-build-journals/145270-casa-de-mesa%E2%80%99s-m3-color-change-from-blue-to-blue) and getting ready to put the motor back in soon. I'm starting to 2nd guess if I should replace a few "might as well" things I opted not to.
                            Build thread: Topaz Blue to Shark Blue

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