Another surging issue

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  • PNWDan
    E30 Fanatic
    • Feb 2011
    • 1326
    #1

    Another surging issue

    I came home from work yesterday and parked the car after my daily 25 mile commute with no issues. Got back in 20 min later to leave and when I started the car the idle was surging between 700 and 1500 on an even rhythm.

    The car is my 87 325is

    So far I've checked the resistance on the ICV and checked the TPS at idle as well as WOT. both are within spec. Turning the key on actuates the ICV to about 3/4 open and buzzing. I have no CEL showing up and ran while spraying carb cleaner all over the boots and hoses. I can squeeze the ICV hose down and the idle stabilizes.

    I need someone to direct me where to go from here. Any help is appreciated.

    1987 Alpinweiß 325is

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    Tags: None
    • paperplane94
      E30 Addict
      • Jul 2011
      • 420
      #2
      Try to actually remove the ICV hose and look for smaller cracks.

        Comment

        • PNWDan
          E30 Fanatic
          • Feb 2011
          • 1326
          #3
          I forgot to mention the ICV hose is new as well

          1987 Alpinweiß 325is

          Like the PNW E30 Local Crew Facebook page

            Comment

            • jlevie
              R3V OG
              • Nov 2006
              • 13530
              #4
              Remove the ICV and clean it. Then replace the O2 sensor unless you have proof that it has less than 100k on it. Follow that with a smoke test of the intake and crankcase & repair as indicated.
              The car makes it possible, but the driver makes it happen.
              Jim Levie, Huntsville, AL

                Comment

                • PNWDan
                  E30 Fanatic
                  • Feb 2011
                  • 1326
                  #5
                  Originally posted by jlevie
                  Remove the ICV and clean it. Then replace the O2 sensor unless you have proof that it has less than 100k on it. Follow that with a smoke test of the intake and crankcase & repair as indicated.
                  Cleaned the ICV and I had replaced the o2 a few months ago for good measure. I guess its smoke test time

                  1987 Alpinweiß 325is

                  Like the PNW E30 Local Crew Facebook page

                    Comment

                    • PNWDan
                      E30 Fanatic
                      • Feb 2011
                      • 1326
                      #6
                      Just to add what the final result was. It was the DME. swapped it out and all is well now

                      1987 Alpinweiß 325is

                      Like the PNW E30 Local Crew Facebook page

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                        • scrowner
                          Member
                          • Feb 2009
                          • 49
                          #7
                          Curious - as I read this answer many times - you just happened to have a DME laying around as a spare?
                          86 325e chumpracer, 87 325e RallyXer, 12 Boss 302LS, 97 Miata

                            Comment

                            • JrCamacho
                              Mod Crazy
                              • Feb 2011
                              • 618
                              #8
                              Originally posted by scrowner
                              Curious - as I read this answer many times - you just happened to have a DME laying around as a spare?
                              Junkyard, son!

                                Comment

                                • PNWDan
                                  E30 Fanatic
                                  • Feb 2011
                                  • 1326
                                  #9
                                  Originally posted by scrowner
                                  Curious - as I read this answer many times - you just happened to have a DME laying around as a spare?
                                  I have a friend lol. He parts out cars and had one for me to try.

                                  1987 Alpinweiß 325is

                                  Like the PNW E30 Local Crew Facebook page

                                    Comment

                                    • scrowner
                                      Member
                                      • Feb 2009
                                      • 49
                                      #10
                                      Tis nice to have E30 friends!
                                      86 325e chumpracer, 87 325e RallyXer, 12 Boss 302LS, 97 Miata

                                        Comment

                                        • drulle
                                          E30 Mastermind
                                          • Dec 2008
                                          • 1906
                                          #11
                                          Oh yeah, its good to have e30 friends like Dan. Now I roll on nice set of wheels. Thanks for all your help Dan and I'm glad I could help out ;)
                                          "i love vee tek, its a wonderful sound when you driving right by it"

                                          If you bought anything from me, please leave a feedback here: http://www.r3vlimited.com/board/show...ghlight=drulle

                                            Comment

                                            • PNWDan
                                              E30 Fanatic
                                              • Feb 2011
                                              • 1326
                                              #12
                                              Thanks to you too Paul

                                              1987 Alpinweiß 325is

                                              Like the PNW E30 Local Crew Facebook page

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