Tachometer needle bouncing around over 4000

Discussion in 'Troubleshooting & Diagnosis' started by JD Z, May 4, 2021.

  1. JD Z

    JD Z Veteran Member

    Messages:
    245
    Likes Received:
    17
    Joined:
    Aug 18, 2017
    Location:
    Shawnee Kansas - Kansas City MO area
    I’m looking to track down the likely contributor to my tachometer issue. It works as normal until it gets to 4000 RPM and the needle bounces around like crazy. The car runs great, just the needle bouncing. It’s a 1980 Z28.

    Would things like the tach filter contribute? I’m hoping the tach doesn’t need to be replaced.
     
  2. Fieryfrog

    Fieryfrog New Member

    Messages:
    1
    Likes Received:
    0
    Joined:
    Tuesday
    Following. I am also running a 1980 Z28, but my tach is bouncing at all times.
     
  3. JD Z

    JD Z Veteran Member

    Messages:
    245
    Likes Received:
    17
    Joined:
    Aug 18, 2017
    Location:
    Shawnee Kansas - Kansas City MO area
    From what I’ve picked up, I’m going to remove the tachometer filter first (it’s right behind the engine bolted to the firewall). Someone said that fixed this problem. Then, I’m going to replace the filter if that does not work. From there it’s onto replacing the tach board. I’ll update when I have one.
     
  4. Ihada70Z28B4

    Ihada70Z28B4 Veteran Member

    Messages:
    185
    Likes Received:
    20
    Joined:
    Oct 4, 2002
    Location:
    Buffalo,NY,USA

Share This Page