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Jumping speedo needle

Discussion in 'How To' started by Mustang Stevo, Dec 20, 2011.

Following users read this thread

  1. Mustang Stevo Well-Known Member

    Member Since:
    Nov 20, 2011
    Message Count:
    40
    Location:
    San Diego
    Hey guys I have this intermittent problem with the speedo in my 91 LX. Usually 40-65 mph the needle starts to jump all the way of the 140. Kinda of chirps a bit when it does it as well. Just started doing this a couple months ago. Any ideas?
    Mustang Stevo, Dec 20, 2011
    #1

  2. wickedstangs

    Member Since:
    Nov 26, 2008
    Message Count:
    13,801
    Location:
    Chula Vista, CA
    yep, sounds like it needs replacing. Its a cable that breaks sometimes cost around 25.00 dollars at Autozone. Pretty easy to replace...

    I also have seen a speedo gear break and cause the samething.. They are made of plastic and it gets hot in the tranny and causes them to fail...

    I will try and get diagrams up if I remember when I get home...
    wickedstangs, Dec 21, 2011
    #2

  3. Mustang Stevo Well-Known Member

    Member Since:
    Nov 20, 2011
    Message Count:
    40
    Location:
    San Diego
    It's really weird. I'll be driving along and the speedo will read normal then all of a sudden it will jump to 140 mph and kinda jumpy. You think the cable would possibly be intermittent like that?
    Mustang Stevo, Dec 21, 2011
    #3

  4. wickedstangs

    Member Since:
    Nov 26, 2008
    Message Count:
    13,801
    Location:
    Chula Vista, CA
    yep.., it a cable that breaks inside a plastic outer... You can also check your firewall and see if there is something binding it up...
    wickedstangs, Dec 21, 2011
    #4

  5. Mustangcwo Crew Chief

    Member Since:
    Feb 11, 2011
    Message Count:
    4,913
    Location:
    Chula Vista, CA
    Yep, time to change out the speedo cable.
    Mustangcwo, Dec 21, 2011
    #5

  6. Mustang Stevo Well-Known Member

    Member Since:
    Nov 20, 2011
    Message Count:
    40
    Location:
    San Diego
    I was just checking out YouTube for a "how to" video on replacing the cable
    Mustang Stevo, Dec 21, 2011
    #6

  7. wickedstangs

    Member Since:
    Nov 26, 2008
    Message Count:
    13,801
    Location:
    Chula Vista, CA
    Did you find one? Post it up...
    wickedstangs, Dec 22, 2011
    #7

  8. Mustang Stevo Well-Known Member

    Member Since:
    Nov 20, 2011
    Message Count:
    40
    Location:
    San Diego
    I found a video on making on making a supercharger out of a hamster cage wheel and a Campbell's soup can, but not a good one on cable replacement. :)
    Mustang Stevo, Dec 22, 2011
    #8
    wickedstangs likes this.

  9. wickedstangs

    Member Since:
    Nov 26, 2008
    Message Count:
    13,801
    Location:
    Chula Vista, CA
    :bounce:
    wickedstangs, Dec 22, 2011
    #9

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