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Speed Sensor Failing?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by bigburban383, Apr 18, 2004.

  1. bigburban383

    bigburban383 1/2 ton status

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    When the speed sensor goes bad on a 90' Burban, does the speedometer needle just jump around sporadically? I looked under and followed the wires and connectors, they look okay. It sucks because my ABS is outta wack too and braking is a trip.
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    pull the sensor and check the reluctor ring and the sensor.

    on my s10, my speedo was possesed. when you step on the gas, the needle went slower. the faster i was going the slower it said i was going when on the gas. when i let off the gas, the needle would show about the correct speed. at 70mph when i had the petal to the floor it showed 10mph and when i let off it was about 70. Thats the fastest the speedo ever moved /forums/images/graemlins/whistling.gif turns out when the tranny blew up 2 weeeks later(t5) the reluctor ring was ground down from metal shavings on the sensor. put a new reluctor ring in the new tranny and it worked perfect.
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    From my understanding of that DRAC setup, you should be able to watch the ECM (need a scanner) and see what the speed sensor says the vehicle is doing.

    With ABS issues it would seem to be more likely the VSS, as I doubt the ABS stuff works off of the speedometer. I'd still hook a scanner up and see what the ECM sees for MPH as you drive.
     
  4. realsquash

    realsquash 1/2 ton status

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    IIRC that speedo is still mechanical and the electronics use a sensor up in the dash or under the hood on the speedo cable.

    Andy
     
  5. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    90 was the first year for electric speedo.
     
  6. bigburban383

    bigburban383 1/2 ton status

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    Scanner, very good idea /forums/images/graemlins/waytogo.gif
     

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