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Jumping Tac

Discussion in 'Chevy Trucks' started by sirsweatsalot, Dec 16, 2002.

  1. sirsweatsalot

    sirsweatsalot Banned
    from MN
    Messages: 25

    i have a 94 chevy with a 4.3 and the tac has been kind of sticking, and then jumping. it used to be pretty accurate but now its mainly just jumping around. the engine does not do what the tac is saying. so my conclusion is electrical problem am i right?
    thanks for your help.
  2. JohnnyU

    JohnnyU 2000 Club Member
    Messages: 2,040

    possibly a short at the tach wire by the ciol, maybe from the coil wire to the tach wire? my friends said his car did that once when a spark plug wire was not connected properly to the plug, not sure if that happened, but its definatley gauge related.