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    Idle Problem

    Hey guys, I need some help. After replacing the alternator, the idle now surges between 800rpm and 1500rpm. Any suggestions on fixing problem? Thanks in advance.

    #2
    Disconnect the alternator and see if the problem goes away for starters.

    Also im guessing you disconnected the battery when installing the alternator and if so then your computer will take over 10min to relearn, so go drive it then see if it goes away.

    1986 325es (69k) Garage Queen Buy It Now 10k;1986 325es (track rat) 2.7i How-To & 1.1/1.3Motronic UpGrade
    1991 318is (daily driver) 1991 318is M42 Maintenance How-To;1989 325i (parts car)

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      #3
      I say drive it, and let it work itself out
      1989 cirrisblau-metallic 325i

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        #4
        Ya, if you disconnected the battery for an extended period of time then you will need to let the car run for a bit so the computer can re-learn itself.
        sigpic

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          #5
          Thanks for the quick replies. Yes, the battery was disconnected during the alternator installation. I've driven the car for a good 40 minutes, but the problem persists.

          Kenika, if I disconnect the alternator and start the car, it would surely drain my battery fast, would it not? Is there a remote chance that the new alternator is causing this idling problem?

          Any other suggestions?

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            #6
            Lol no you will not drain the battery quickly it would take a good 20min with a full battery.

            So give it a try, many new alternators will have problems so you may have got you hands on a bad one worth a try.

            Also make sure you didnt cause a vacuumed leak some where when replacing the alternator.

            Go over everything you took apart to double check.

            1986 325es (69k) Garage Queen Buy It Now 10k;1986 325es (track rat) 2.7i How-To & 1.1/1.3Motronic UpGrade
            1991 318is (daily driver) 1991 318is M42 Maintenance How-To;1989 325i (parts car)

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              #7
              Originally posted by kenika65 View Post
              Also make sure you didnt cause a vacuum leak somewhere when replacing the alternator.
              My thoughts exactly.

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                #8
                +1
                Build Threads:
                Pamela/Bella/Betty/325ix/5-Lug Seta/S60R/Miata ITB/Miata Turbo/Miata VVT/951/325xi-6

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                  #9
                  Problem pretty much went away after a long drive. Thanks guys for the quick responses.

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