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Jumpy Tach

Discussion in 'General Tech and Maintenance' started by D See 2, Mar 13, 2003.

  1. D See 2

    D See 2 Senior Member

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    what could cause a tachometer (both aftermarket and stock) to be jumpy. its very erratic. it didnt always do this. just started a couple of months ago. could a faulty distributor igniter cause this.
     
  2. D See 2

    D See 2 Senior Member

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    no one knows what could make a tachometer be erratic?
     
  3. liquid00meth

    liquid00meth Senior Member

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    uhh erratic Tach could be your clutch is all done bro :)


    the clutch slips all the time, and makes the revs fluctuate, even maybe not audibly. Usually this is easy to notice because of engine noise. It all depends on how erratic and when
     
  4. hcivic.com

    hcivic.com Senior Member

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    my buddys 89 tegra had the same problem we had to replace the a senor wthin the distributor which was causing a poor spark and the altinator was also bad
     
  5. 90 accord

    90 accord Chicks dig the box Moderator VIP

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    i'm assuming that your engine does not rev up with the tach?

    i had a similar thing happen to me, took it to a dealership,and they said the wires that attach to the coil were comming off. they re soldered them and it works fine now
     
  6. enemycivic

    enemycivic Member

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    Is you ecu showing any codes? This idle jumping up and down like that is one of several things to check. The IAC valve, perform a vaccum check,.
     
  7. D See 2

    D See 2 Senior Member

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    its not my idle or motor...JUST the tach. the engine itself does NOT fluctuate in idle.
     
  8. enemycivic

    enemycivic Member

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  9. jamiedude

    jamiedude Senior Member

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    my crx did that when i first bought

    my tach was moody didnt wanna work when i wanted it too

    i always caught it working when i could really careless if it did

    :angry: litte bastard :angry:

    i replaced the clutch(becuase it was shot) and it works like a champ now

    i agree with liquid00meth
     
  10. VtSol

    VtSol Junior Member

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    It could be your coil wires. Sometimes when there is bad connections between them, the RPMs will fluctuate that way, only on the needles. Check for old or corroded wires or just bad connections in your wires.
     
  11. asmallsol

    asmallsol Super Moderator

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    With the aftermarket tach, are you running right off the ECU? I would also try to use a multimeter and check the RPMs that way. It could also be a short some where. Is it all the time or just at Idel? How much does it bounce?
     
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