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M20 Missing under load/ rough idle.. Searched

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    #1

    M20 Missing under load/ rough idle.. Searched

    My car has recently started to stumble at idle and under load.
    It stumbles between 1k and 2k and above that it pulls strong. The Idle is lopey and some times erratic.
    I have recently replaced:
    Plugs
    wires
    plugs again
    cap
    rotor
    distributor
    fuel filter (about 2yrs ago)
    fuel pump (replaced with a working low mileage unit)

    I have also cleaned most of the electrical connections associated with the air fuel delivery (AFM, ICV, TB)
    Here is a video to better explain what i mean:

    from the exhaust end:


    Ive run a bottle of seafoam and about 3 bottles of injector cleaner through the system (over a period of a few months) to no avail. Sorry for the shitty quality... i only have my cell phone with me...
    Last edited by sticksdaman; 03-27-2009, 02:59 PM.
    Originally posted by ebelements
    Also, for those who don't know, negative camber is the greatest thing since sliced bread(panera). Even tire wear is for city busses and the elderly.
    Tags: None
    #2
    check for a vacuum leak. I had the same problem. it's worth getting a multimeter and checking that you're getting proper resistance, etc. from all your ignition components.
    '89 325i track sloot
    '01 530i daily

    -Enginerd

    Comment

      #3
      Try adjusting the valves.

      Note: It's a little tricky to get them just right.
      I'm Not Right in the Head | Random Rants and other Nonsense1st Order Logic Failure: Association fallacy, this type of fallacy can be expressed as (∃x ∈ S : φ(x)) → (∀x ∈ S : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true".

      Comment

        #4
        I'll look into replacing my hoses... Any other suggestions?
        Originally posted by ebelements
        Also, for those who don't know, negative camber is the greatest thing since sliced bread(panera). Even tire wear is for city busses and the elderly.

        Comment

          #5
          That set of symptoms would best match an intake leak or a bad AFM.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

          Comment

            #6
            Originally posted by sticksdaman View Post
            I'll look into replacing my hoses... Any other suggestions?
            when I had this problem, it was because I'm a dumbass and thought I had properly set the boot around my AFM, but it had tucked under right where I couldn't reach. I found, put it on right, the car runs great. :)
            '89 325i track sloot
            '01 530i daily

            -Enginerd

            Comment

              #7
              -check afm resistance (refer to bentley) when cold and when you move the flap (should be smooth, no binds in increase of rest/physically.
              -check ICV resistance
              -vacc. leaks
              sigpic

              Comment

                #8
                The Bentley manual won't tell you the specs for resistance on the AFM for 6 cylinder cars. Just FYI.
                sigpic
                Been over a year and it still doesn't the other motor mount made...

                Comment

                  #9
                  ^+1 all it says is to check for flat spots in the resistance change.

                  '89 Alpine S52 with goodies

                  Comment

                    #10
                    Coil?
                    Maybe try a compression test?

                    Comment

                      #11
                      The coil seemed to be in working order when i last checked.. but I have a spare that i can swap in the next time i have a free weekend. I'll replace all of the vacc hoses also and see where that gets me.

                      The car hasnt had its valves adjusted since 06 so again, another thing i will look into when the time is available.

                      Thanks!
                      Originally posted by ebelements
                      Also, for those who don't know, negative camber is the greatest thing since sliced bread(panera). Even tire wear is for city busses and the elderly.

                      Comment

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