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Thread: 240z tacho problem

  1. #1
    Registered User zr240's Avatar
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    Default 240z tacho problem

    Hi

    I was wondering if anyone could help me with this tacho problem.

    Its a std tacho on my 240z, It was working fine for ages and now when I start the car it only seems to be reading about half the amount of revs the car is doing. Sometimes after a while it will all of a sudden start working correctly but then when I turn of the car and re start it is inacurrate again.

    any clues?

    I have another tacho so I am probably going to change it to see if I have just got a dead tacho, just thought I would ask to see first

    thanks
    Ash

  2. #2
    240Z Elec. Upgrade guy Zs-ondabrain's Avatar
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    Default

    Most likely it's not dead, just in need of some t.l.c.

    If you pull it, look for any loose connections both internal and external, most of the time the vibration from your Z will cause things to come loose
    and the starting of the car can make the connection work and the next time the connection will jiggle loose,

    something to think about b-4 you jump the gun.

    Dave
    Rate my Z at Car Domain.com
    My 70' 240Z, Daily Driver

    My Parking Light and Headlight Upgrade Harness's at MotorSport Auto
    HLH - PLH - SCP - ZXP's at MSA *They accept PayPal!!*
    Headlight Upgrade Harness info here at ClassicZCar Club
    HLH info at CZCC Do a search for info on the other upgrades I offer.

  3. #3
    Registered User joedatsun's Avatar
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    Default

    I've had some of the same symtoms with my tach. Sometimes it works, other times it shows half of the actual RPMs. I'm going to pull it over the weekend to see what's loose (if anything).

  4. #4
    HLS30165540
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    Default

    My tach did the same. It slowly got worse, bouncing, reading 1k lower than actual. I ended up taking it out and taking it to a tach repair shop. $40.00 U.S. and it was fixed.
    The 1973 240Z 165540 Slightly modified. L28, 5sp, cam, headers, MSD 6AL, power windows, power door locks, leather seats, custom this and custom that.

  5. #5
    240Z Elec. Upgrade guy Zs-ondabrain's Avatar
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    Default

    Hey Ed,

    did they tell you what they fixed as a result of your $40.00
    or did they tighten every thing up and charge you labor?

    let me know and NO I'm not trying to be a smart-ass, I'm serious.

    Thanks much,

    Dave
    Rate my Z at Car Domain.com
    My 70' 240Z, Daily Driver

    My Parking Light and Headlight Upgrade Harness's at MotorSport Auto
    HLH - PLH - SCP - ZXP's at MSA *They accept PayPal!!*
    Headlight Upgrade Harness info here at ClassicZCar Club
    HLH info at CZCC Do a search for info on the other upgrades I offer.

  6. #6
    Registered User Ben's Avatar
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    Default

    Fair call....

    I'd expect that between the dry joints & a leaky capacitor or two, it was stuffed!

    Below are images of the internals of an early 260Z (inductive loop) tachometer:

    Ben
    Adelaide,
    South Australia.
    IZCC#1902
    HS30-103353
    1973 240Z (L28ET)
    WGNC34-008753
    1996 Stagea RS-Four V (RB25DET)
    DR30-035184
    1983 DR30 Skyline RS-X Turbo (FJ20ET)

  7. #7
    Registered User zr240's Avatar
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    Default

    Thanks for the help guys.

    I am going to pull it out tommoror and try the other tacho I have. I will let you all know the result.


    Thanks
    Ash
    Ashley
    73 240Z Race car (nearly finished)
    71 240Z road car (nearly started!)

  8. #8
    Registered User zr240's Avatar
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    Default

    Just to let you guys know I tried a different tacho and it works fine so there must have been a problem with the original

    ash
    Ashley
    73 240Z Race car (nearly finished)
    71 240Z road car (nearly started!)

  9. #9
    HLS30165540
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    Default Dave

    It was a while ago but the guy told me he did have to replace something. Don't know what for sure. But it has been working fine since so I can't complain.
    The 1973 240Z 165540 Slightly modified. L28, 5sp, cam, headers, MSD 6AL, power windows, power door locks, leather seats, custom this and custom that.

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