Part 1: 1990-1993 Miata crazy idle / revs up and down constantly.

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  • เผยแพร่เมื่อ 12 ส.ค. 2022
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ความคิดเห็น • 27

  • @neilthommesen4059
    @neilthommesen4059 ปีที่แล้ว +2

    Another excellent video, thanks Miata Man. I’m over in England but I subscribed and watch all your posts, even though I’ve not got or had this problem on my Eunos. Your videos are so educational and easy to understand, I must let you know some of your videos have helped me out massively. Thank you, looking forward to part 2 👍

  • @keltonbange5882
    @keltonbange5882 5 หลายเดือนก่อน +4

    im so happy i found these videos my NA6 goes from idling at 3000 to 100 and damn near dying

  • @mattjacomos2795
    @mattjacomos2795 4 หลายเดือนก่อน +3

    After much "experimentation" with my 1995 Mazda MX3, I have found the erratic idle is generally caused by a vacuum leak OR a mis set Throttle Stop Screw (TSS).
    The TSS should not be adjusted as it is set from the factory, but if someone has touched it, one of the issues it can cause is an erratic idle.
    TSS clearance affects the whole baseline setting of the system.
    You would intuitively think that the TSS should contact the throttle, but it DOESN'T.
    That's why a mechanic may have previously adjusted the stop.
    The Inlet Air Control valve is only trying to compensate for incorrect TSS clearance.
    When you changed the whole Throttle Body over, you may have swapped in a properly adjusted (or more likely untouched) TSS and therefore (inadvertently) solved the issue.
    I have a couple videos checking for leaks and fixing the issue, but I have found the TSS setting to be the most critical in sorting out this hunting idle.

  • @WiSeNhEiMeR-1369
    @WiSeNhEiMeR-1369 ปีที่แล้ว +3

    HOWdy M-M,
    Thank YOU for this Idle Problem - INFORMATION
    COOP
    ...

  • @tedstriker754
    @tedstriker754 ปีที่แล้ว +8

    Not a good situation. Those idle air control valves are very expensive. I've not found one for less than $650. (new) in most cases they are even more. Used ones are not easy to find. The Miata salvage yard near me say those are the first things to go when they get in a wrecked Miata. There's some underhanded greedy marketing going on for new ones to cost that much.

  • @johnnycee5179
    @johnnycee5179 9 หลายเดือนก่อน +1

    I recently had problems with my 91, starting up fine, revving ok but would not hold an idle. Idle would drop way down then it stalled out. While taking it apart I found out the accordion section of cross over pipe had some big tears in it that couldn't be seen. Duct taped it up and it idles great now.

    • @MiataMan
      @MiataMan  9 หลายเดือนก่อน +1

      Awesome 👍 Thanks for sharing

  • @johnnycee5179
    @johnnycee5179 ปีที่แล้ว +1

    You didn't use carburetor cleaner on it did you?

  • @yeboikaleb6884
    @yeboikaleb6884 ปีที่แล้ว +3

    Sorry if this is a dumb question but what does unplugging the iac sensor do to help the idle? What does you unplugging it actually tell you that you need to replace it? I'm having a similar issue and kind of want to understand how everything works better.

    • @QuincyStick
      @QuincyStick 9 หลายเดือนก่อน +1

      Well if the idle air control valve is malfunctioning unplugging it will stop it from operating in any sort of fashion, so it's just sitting in set position. If the idle smooths out like this, then you know it's the issue.

  • @johnnycee5179
    @johnnycee5179 ปีที่แล้ว +1

    Almost sounds like a vacuum leak but my educated guess would be IAC

  • @johnnycee5179
    @johnnycee5179 9 หลายเดือนก่อน +1

    Clean the IAC and the IACV both real good with throttle body cleaner.

  • @pilotzayic8699
    @pilotzayic8699 ปีที่แล้ว +6

    I'm having a similar issue with my 93 NA, but it's when idle and fluctuates from 100-850rpm, recently it's been even dying. It will go from a stable 850 rpm then randomly Rev down and up and then die. Starts right back up everytime though..too easily it seems.

    • @adama.prince868
      @adama.prince868 ปีที่แล้ว +1

      this is my exact problem i’m gonna do what he did and report back🤞🏽

    • @adama.prince868
      @adama.prince868 ปีที่แล้ว +1

      exact model and everything too

    • @iAnthony
      @iAnthony ปีที่แล้ว +1

      Sounds like a vaccum leak

    • @hey6982
      @hey6982 8 หลายเดือนก่อน

      Does it bog or choke if you try driving it?

  • @chrisnake56
    @chrisnake56 ปีที่แล้ว +4

    I’m having this issue but I’m also getting a burning smell if I use the throttle

    • @MiataMan
      @MiataMan  ปีที่แล้ว +1

      Does it smell like burning rubber or is it smell like burn electronics?

  • @BenM
    @BenM ปีที่แล้ว +2

    motor is running on gasoline and paranormal activity

  • @jimcook8933
    @jimcook8933 9 หลายเดือนก่อน +1

    There's a nasty noise on top of the up and down idle!

  • @therealspixycat
    @therealspixycat 3 หลายเดือนก่อน +1

    So how did you fix this?

    • @MiataMan
      @MiataMan  3 หลายเดือนก่อน

      There are follow up videos, but in the end it was a water damaged ECU.

    • @therealspixycat
      @therealspixycat 3 หลายเดือนก่อน

      @@MiataMan yeah I saw several follow up videos but Missed the final one. That a nasty problem when it turned out to be the ecu. Also expensive.

  • @slyonme
    @slyonme ปีที่แล้ว +1

    a lot of the time this method doesnt work

    • @rileyyyyh
      @rileyyyyh 4 หลายเดือนก่อน

      what does??

  • @dylanrapone5366
    @dylanrapone5366 ปีที่แล้ว

    let me get your number i have a 90 with mutiple issues been reliable af tho