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    #1

    I hate making threads like this.

    But I need your collective knowledge and experience. So, I just did a bunch of maintenance on my 325i. Cap, rotor, wires, plugs, air filter, fuel filter, o2 sensor, and I seafoamed it. I put the new o2 sensor in after running the seafoam out of the fuel. It ran beautifully for about 2 days, it was more quiet than I even knew these engines could get, and it had a calm healthy idle.

    Then... it started sputtering, which is not something it did before. In first gear when accelerating from a stop, and in 2nd and 3rd gear under heavy acceleration.

    Anyone have any idea as to what would cause this, suddenly, after a tune-up? I'm thinking vacuum leak so I replaced the breather hose and the ICV to Intake Manifold hose, which did not help and may have actually made it more noticeable. I'll further pursue the vacuum leak idea, if that is the consensus.

    I've searched for threads about sputtering, but I'm specifically interested in what would cause it suddenly, after a tune up, and after running perfectly for 2 days after the tune-up.

    Thanks
    Check my feedback HERE

    Tags: None
    #2
    Sea Foam may have cleaned the tank really well and clogged your new fuel filter? Or, if your fuel pump's little plastic screen thing fell off in the tank (it's happened to me) it might have gotten gunked up.

    Just thoughts...
    "A good memory for quotes combined with a poor memory for attribution can lead to a false sense of originality."
    -----------------------------------------
    91 318is Turbo Sold
    87 325 Daily driver Sold
    06 4.8is X5
    06 Mtec X3
    05 4.4i X5 Sold
    92 325ic Sold & Re-purchased
    90 325i Sold
    97 328is Sold
    01 323ci Sold
    92 325i Sold
    83 528e Totaled
    98 328i Sold
    93 325i Sold

    Comment

      #3
      Originally posted by Schnitzer318is View Post
      Sea Foam may have cleaned the tank really well and clogged your new fuel filter? Or, if your fuel pump's little plastic screen thing fell off in the tank (it's happened to me) it might have gotten gunked up.

      Just thoughts...
      Very interesting. Clogged fuel filter does make a lot of sense.

      Thanks
      Check my feedback HERE

      Comment

        #4
        anyone else?
        Check my feedback HERE

        Comment

          #5
          loose fitting plug wires are not all that uncommon. Double check to make sure they are tight on the plugs.

          Comment

            #6
            Originally posted by Sagaris View Post
            loose fitting plug wires are not all that uncommon. Double check to make sure they are tight on the plugs.
            and on the cap

            did you seafoam before or after the plugs? I've seen seafoam crud up plugs once
            1989 cirrisblau-metallic 325i

            Comment

              #7
              Originally posted by Sagaris View Post
              loose fitting plug wires are not all that uncommon. Double check to make sure they are tight on the plugs.
              I did check that, they pop off pretty easily, but I think they are making good connection.

              Originally posted by SpecM View Post
              and on the cap

              did you seafoam before or after the plugs? I've seen seafoam crud up plugs once
              After, I'll pull a plug out and check. Thanks
              Check my feedback HERE

              Comment

                #8
                Check your fuel pressure regulator for vac leaks, because if it leaks vacum it also leaks fuel.

                Comment

                  #9
                  Originally posted by TOM1911 View Post
                  Check your fuel pressure regulator for vac leaks, because if it leaks vacum it also leaks fuel.
                  I did check that, put a new vac line on it.
                  Check my feedback HERE

                  Comment

                    #10
                    Do you think the Seafoam may have caused the new plugs and O2 sensor to get gunked up from some of the dislodged carbon deposits? Beyond that, im stumped?

                    Comment

                      #11
                      Originally posted by Sagaris View Post
                      Do you think the Seafoam may have caused the new plugs and O2 sensor to get gunked up from some of the dislodged carbon deposits? Beyond that, im stumped?
                      Maybe the plugs, as mentioned before. I put the new O2 sensor on after I had already run most of the seafoam out of the system, so I'm confident that it's not the O2 sensor, I think.
                      Check my feedback HERE

                      Comment

                        #12
                        I am having the same problem - or a similar problem - my #5 was misfiring, changed the plug - still misfiring - pulled the wires - fouled new wires. Replaced them and it is still doing it - took it to a local indy shop and they are thinking maybe a broken ring on that cylinder - gonna talk to them tomorrow - so I will let you know if that was the cause

                        (my symptoms are the same as yours - and I recently did the same work you did)

                        keep you posted

                        Comment

                          #13
                          Oh, wow. I didn't even consider it could be something serious. Thanks for the info.
                          Check my feedback HERE

                          Comment

                            #14
                            Did they check injectors che13? If its dropped a ring it should have more symptoms like high crankcase pressure, Smoke, obviously low compression in that cylinder. I hardly see that a ring will drop with only that symptom. Try taking that spark plug out and running it briefly and seeing whether any oil is feeding out or fuel is feeding out. just have a fire extinguisher handy. It sounds to me like an injector or a bad rotor

                            Comment

                              #15
                              How's your AFM?

                              Comment

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