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Car not reading speed correct

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    #1

    Car not reading speed correct

    I picked up a 93 two door the other day. Loving having a cb7 again.

    On my way to work today I noticed my speed was wrong. I was easily going 75+ but my speedometer said I was going about 50.

    What could be the issue?
    Does anyone else have a monthly budget of 10mm sockets or is it just me?
    Tags: None
    #2
    VSS (vehicle speed sensor) I would guess. Maybe missing teeth or lack of fluid. or the cluster is on it's way out but I doubt it. Does it work correctly at low speeds? Does it ever stop working ?

    Comment

      #3
      It's far more accurate at low speeds. The speedometer won't go much past 50ish.
      Does anyone else have a monthly budget of 10mm sockets or is it just me?

      Comment

        #4
        Originally posted by Rat View Post
        It's far more accurate at low speeds. The speedometer won't go much past 50ish.
        Ya, check out the VSS I'd say.

        Comment

          #5
          I will be checking it out. But here is where things get strange. On my way home it was reading right.
          Does anyone else have a monthly budget of 10mm sockets or is it just me?

          Comment

            #6
            So one way or another you just need to inspect the items that give you speed readings. VSS, wiring, ECU, and gauge cluster. Not sure if you are an auto or manual but the VSS is gear driven. So inspecting the VSS gear itself should be done fist. I believe it's two bolts... easy to remove. Got a manual ¿

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              #7
              Something to consider is tire size too. I have the hunch that mine is off since I run 195/50/15 and the total diameter could be off just enough to cause it especially since I've changed the sensor and the speed still reads off the same mph.

              Comment

                #8
                I'm running oem wheels so that should be the issue. It's an automatic. I'll be going to my local scrap yard this weekend and I'll pull a unit from a car. Looks easy enough to remove assuming I have enough extensions.
                Does anyone else have a monthly budget of 10mm sockets or is it just me?
                • 1 like

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                  #9
                  If it comes down to it, the speedometer itself can be changed out of the cluster so you can retain your correct odometer. I'm pretty sure the odometer works off the same speed signal, so if the odo is reading correctly, it may be the speedometer.
                  90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
                  08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums

                  Comment

                    #10
                    Originally posted by Rat View Post
                    I'm running oem wheels so that should be the issue. It's an automatic. I'll be going to my local scrap yard this weekend and I'll pull a unit from a car. Looks easy enough to remove assuming I have enough extensions.
                    Ya, remove the air intake tube and you'll be good.

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