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    #1

    Sputter at idle

    OK guys it's time to ask what you think.

    My car runs great...with a single exception. It has a slight sputter/miss at idle which sits around 750. It has had this symptom since the first time I started the car after the swap. I have noticed it will still do this up to about a 2500 RPM free rev.

    I currently have about 1500 miles on the swap at this point with no change in condition.

    There does not seem to be any real effect on the car. Power delivery is strong and smooth, but I am concerned that if left unattended it could lead to other issues.

    No codes, no vacuum leaks, pulled the plugs and they looked OK and it's running a TRM tune.

    Any ideas before I take it to my indy guy to troubleshoot?

    :dot:

    I appreciate the assistance, thanks!
    Last edited by giantkeeper; 07-24-2011, 08:16 AM.
    Originally posted by blunttech
    Always Always go for the reach around if there is an option
    Tags: None
    #2
    Originally posted by blunttech
    Always Always go for the reach around if there is an option

    Comment

      #3
      Is the symptoms present only when the engine is cold or is always sputtering at low idle even at running temperature? Also what is it idling at?

      Comment

        #4
        Originally posted by e46s54dr View Post
        Is the symptoms present only when the engine is cold or is always sputtering at low idle even at running temperature? Also what is it idling at?
        It sputters consistently hot or cold. Idle is pretty solid at 750....
        Originally posted by blunttech
        Always Always go for the reach around if there is an option

        Comment

          #5
          Have you tried running the 3" MAF and factory chip to see if the sputter is still there?

          Comment

            #6
            Originally posted by Jalves619 View Post
            Have you tried running the 3" MAF and factory chip to see if the sputter is still there?
            No, I don't have the 3" maf anymore :(
            Last edited by giantkeeper; 07-23-2011, 03:45 PM.
            Originally posted by blunttech
            Always Always go for the reach around if there is an option

            Comment

              #7
              check TPS and clean ICV. check back

              Originally posted by Roysneon
              $5 shipped?
              Originally posted by MarkD
              You are a strange dude, I'n not answering any more posts from you.

              Comment

                #8
                It's not detonating at idle. I think you mean misfire.

                You probably have an air leak after your MAF.

                Comment

                  #9
                  Originally posted by matt View Post
                  It's not detonating at idle. I think you mean misfire.

                  You probably have an air leak after your MAF.
                  Right, misfire sounds accurate. I'll take it to my guy and smoke test it. I did the "carb cleaner" test and was unable to find any leaks.

                  Thanks Matt!
                  Originally posted by blunttech
                  Always Always go for the reach around if there is an option

                  Comment

                    #10
                    Smoke tested the car today - no leaks.
                    Originally posted by blunttech
                    Always Always go for the reach around if there is an option

                    Comment

                      #11
                      Next, I would try replacing the spark plugs with new ones and test all your coils.

                      Does the problem change if you put your foot on the brake? I've seen boosters that only leak when you press them.

                      Comment

                        #12
                        Originally posted by matt View Post
                        Next, I would try replacing the spark plugs with new ones and test all your coils.

                        Does the problem change if you put your foot on the brake? I've seen boosters that only leak when you press them.
                        Thanks Matt - I'll swap the plugs this week and test the coils.

                        No issues with the booster at this time, although I did have a leak at the booster inlet plug initially.
                        Originally posted by blunttech
                        Always Always go for the reach around if there is an option

                        Comment

                          #13
                          Check your o2 sensor for functionality

                          Comment

                            #14
                            Swapped out the 1500 mile NGK plugs and dropped in Bosch OEM replacements yesterday. No change in condition.
                            Originally posted by blunttech
                            Always Always go for the reach around if there is an option

                            Comment

                              #15
                              Update - drove the car to work today. The idle is lower, but there was far less sputtering. When I finally got home it was non existent.

                              We shall see how things go the rest of the week...and on the dyno Saturday.
                              Originally posted by blunttech
                              Always Always go for the reach around if there is an option

                              Comment

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