M20 Missing under load/ rough idle.. Searched

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  • sticksdaman
    R3VLimited
    • Apr 2005
    • 2987
    #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, 01:59 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
    • whiltebeitel
      R3VLimited
      • Apr 2007
      • 2098
      #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

        • Liam
          Mod Crazy
          • Mar 2009
          • 753
          #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

            • sticksdaman
              R3VLimited
              • Apr 2005
              • 2987
              #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

                • jlevie
                  R3V OG
                  • Nov 2006
                  • 13530
                  #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

                    • whiltebeitel
                      R3VLimited
                      • Apr 2007
                      • 2098
                      #6
                      Originally posted by sticksdaman
                      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

                        • PУCCKAЯ_e30ka
                          E30 Fanatic
                          • Jan 2006
                          • 1226
                          #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

                            • duodvlhntr
                              Advanced Member
                              • Mar 2007
                              • 111
                              #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

                                • Adrian_Visser
                                  R3VLimited
                                  • Jun 2006
                                  • 2823
                                  #9
                                  ^+1 all it says is to check for flat spots in the resistance change.

                                  '89 Alpine S52 with goodies

                                    Comment

                                    • Manya
                                      Noobie
                                      • Nov 2008
                                      • 7
                                      #10
                                      Coil?
                                      Maybe try a compression test?

                                        Comment

                                        • sticksdaman
                                          R3VLimited
                                          • Apr 2005
                                          • 2987
                                          #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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