Idling/Revving Issue

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  • badguise
    Member
    • Sep 2015
    • 57
    #1

    Idling/Revving Issue

    E30 beginner here. 1990 325iS.

    When the car is idling and I lightly tap the gas (and rev to about 1100 RPM or so) the engine putters a bit and sounds like it's going to stall. I stop it from stalling by pushing in the clutch or revving higher, but it has stalled before. Idle is around 8000 RPM and it seems to be more noticeable when the engine is cold.

    How should I begin diagnosing this?

    Let me know if y'all need any more info. Thanks!
    Tags: None
    • dnguyen1963
      R3VLimited
      • Nov 2011
      • 2648
      #2
      Smoke test would be my first option.

        Comment

        • LateFan
          R3V Elite
          • May 2013
          • 4399
          #3
          Originally posted by badguise
          "Idle is around 8000 RPM..."
          That's not gonna end well....

          But seriously, I agree with dnguyen1963 to start with vacuum leaks, idle control valve, throttle position switch....go from there.

          Get the Bentley shop manual - it has good diagnostic steps.

          Also search for JLevie posts on troubleshooting. He has a good list of steps to do in order.

            Comment

            • biodose
              Advanced Member
              • Jun 2015
              • 145
              #4
              Originally posted by badguise
              8000 RPM
              Originally posted by LateFan
              That's not gonna end well....
              I have a feeling he meant 800. There's no way in hell a stock M20 reached 8k without imploding.

              As for the issue at hand, vacuum leak check is what I would do. Also make sure your ICV is operating properly.
              Support my E30 addiction! Buy my Wideband/Voltmeter Check Panels
              HERE

              1990 Flachalpinweiß 335i

                Comment

                • badguise
                  Member
                  • Sep 2015
                  • 57
                  #5
                  Originally posted by badguise
                  Idle is around 8000 RPM...
                  Ha, my bad. Definitely meant 800.

                  I'll start with a hunt for vacuum leaks. I'll dig around the forums and Bentley for info, but if anyone can recommend a particularly good resource or tutorial on how to find the leaks that would be awesome.

                  Thanks folks.

                    Comment

                    • Downshift-E30
                      Member
                      • Nov 2015
                      • 88
                      #6
                      I believe bavauto has a whole thread on it. Try searching bavauto vacuum leaks or just leaks


                      Sent from my iPhone using Tapatalk
                      R&M Performance Auto Care
                      Daily: 03' 530i
                      Project: 87' 325e race/track car
                      BMW Gearhead/Tech

                        Comment

                        • dnguyen1963
                          R3VLimited
                          • Nov 2011
                          • 2648
                          #7
                          Originally posted by badguise
                          Ha, my bad. Definitely meant 800.

                          I'll start with a hunt for vacuum leaks. I'll dig around the forums and Bentley for info, but if anyone can recommend a particularly good resource or tutorial on how to find the leaks that would be awesome.

                          Thanks folks.
                          Google
                          https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=E30+smoke+test&tbm=vid
                          Search the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly what you're looking for.

                            Comment

                            • ecsk
                              Advanced Member
                              • Nov 2011
                              • 106
                              #8
                              There are plenty of BMW idle trouble shooting information in internet

                              This is a good start before smoke test.

                              http://www.pelicanparts.com/BMW/tech...leshooting.htm

                                Comment

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