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Discussion Starter #1
Hey guys,

I searched around the forum, and found a lot of information regarding Odometers that jump around or display odd information (including on the ECR site), but not much about jumping speedometers.

This morning my speedo started to jump around the dial. I was going 45, and it started to jump between 40 and 45, then it dropped to 30, moved back up into the 40s, and then dropped to 0. It did this my whole drive to work.

Is this something that is an easy fix? Would prefer to fix than get a VDO (can you keep original mileage with VDO?). I have Paul and Erich nearby at British Rover, is this something those guys could fix?

Thanks,

Andy
 

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My '97 does the same thing. On start-up, it tic,tic,tic's around 0 then jumps all the way to max speed, back to zero and the operates fine....well most of the time. Sometimes it will do this floating routine and bobble around from 30-ish to 65-ish. Been doing this since 2002. When it does the float routine, I turn on my park lights and it stops and goes to the correct speed. I've always felt it was a grounding problem or something in the alternator that's causing the problem. I re-did all the grounding points for the instrument cluster, but nothing changed. My local speedometer shop said it was most likely a grounding problem.

Dennis
 

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Hi Andy if you have a mech speedo it is normally the speedo drive cable from the box to the speedo head the inner cable is rubbing and causes the needle to "twitch".

also this is caused by the cable getting pulled or twisted after work in the back of the engine or the dash.

used to be a common problem in the early 90/110 that had a 2 piece speedo cable.
easy home fix but need piano players fingers to release the cable lock from the back of the speedo head.

if it is a later TD5 or electronic speedo check for a bad earth or cracks in the plastic on the sender sensor on the box


regards

Gren
 

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Discussion Starter #4
Thanks guys,

Driving home last night with the lights on, it was not a problem. This leads me to think it is probably similar to Dennis' issue.

Andy
 

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Andy,
Were you ever able to resolve this "wondering" problem ?

Over a year ago I had Hollywood Speedometer fix the shaky odometer & informed them of this wondering issue and they felt it was the alternator too.

I switched out my alternator for a new unit about 2 months ago and in about 2500 miles, the speedometer began behaving the same as the old one which had about 150K miles on it.

I'm now wondering now if it might be a Transducer problem ( pt# YBE100540 ) or possibly a wiring issue?
 

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Resurrection

Search brought me here...

Resurrecting as I am experiencing the speedo issue in my 1997 NAS90 where it drops speed, then might rebound to accurate, then drops to zero or bounces around to other speeds.It can sit at zero for a period of time, so it is keeping me from driving it. Seems to mostly do it when it is cold outside (probably coincidence I would imagine). Last year I had the odometer issue repaired by N. Hollywood and it wasn't doing it prior to that. The cable that goes into the back of the speedo housing can be wiggled around so there is some play there. So far that is all I have.

Has anyone confirmed that it is usually the VSS or transducer? I obviously don't have cruise to see if that works when this happens, and the engine seems to run fine without any weirdness.

All help appreciated.
 

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My '97 is still doing this "wandering" thing.
I've replaced the Alt. with a 100 Amp unit, still no change.

I have a AudioVox cruise control system & I use the speedo transducer for the speed signal.
I've never tried to see if it wanders while the cruise is set but the cruise never drops out or acts erratic. I'm usually paying attention to my RPM's and my separate Lowrance GPS speed.
 

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If the cruise control works fine when it does this then it is the speedo itself or the wiring to the speedo. If both die, it is the sender or wiring.
 

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Got the Defender back from the shop. Have tried multiple VSS and symptoms remain. Now to research replacement speedo’s for my 1997 NAS90. Anyone have a suggestion for a replacement speedo?
 

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You could get a Td5 speedo from the UK, but you'd need to change the drive gear and transducer in the transfer box.
 

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On old mechanical driven speedo's jumping around always seemed to be a prelude to speedo cable failure.

On an electronic speedo, if you think yours is going bad, get a VDO. I had the mileage corrected on mine by the vendor https://www.lspeedo.com/
 

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On old mechanical driven speedo's jumping around always seemed to be a prelude to speedo cable failure.

On an electronic speedo, if you think yours is going bad, get a VDO. I had the mileage corrected on mine by the vendor https://www.lspeedo.com/
Thanks! So I figured out I need VDO 437-155 right? Anything else to make it work? Fingers crossed it’s not the wiring.
 

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That's the one I got.
They charged $45 to adjust mileage to your current miles.
To calibrate it drive two miles after setting it into calibration mode.
 

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Hi Andy if you have a mech speedo it is normally the speedo drive cable from the box to the speedo head the inner cable is rubbing and causes the needle to "twitch".

also this is caused by the cable getting pulled or twisted after work in the back of the engine or the dash.

used to be a common problem in the early 90/110 that had a 2 piece speedo cable.
easy home fix but need piano players fingers to release the cable lock from the back of the speedo head.

I have a mechanical - its doing the same thing, twitching, and makes a lot of noise when I start to drive and when its very cold out. Eventually it "warms up" and stops making a fuss.

Gren you mentioned wires being pulled or twisted and an easy home fix. What do you mean by piano players fingers to fix, and what exactly is the fix?
 

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I have a mechanical - its doing the same thing, twitching, and makes a lot of noise when I start to drive and when its very cold out. Eventually it "warms up" and stops making a fuss.

Gren you mentioned wires being pulled or twisted and an easy home fix. What do you mean by piano players fingers to fix, and what exactly is the fix?
I have the same issue, mechanical cable. The interesting part is my odometer didn’t work when I received our truck. Replaced the speedo, now the odometer works perfectly, but the speedo jumps around and makes a ton of noise. I pulled back off the binacle, reassembled and still it’s still jumping around.

Any suggestions?
 

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Good timing for this to come back up, as mine is also jumping, occasionally makes some clicking noise or sits at 0. New mechanical MPH speedo & cable. The cable is Britpart & the square insert part that goes into my speedo is plastic. I figured it stripped out. It was in good condition when I checked it. It's not a loose connection at the speedo & fits tight. I'm thinking the cable must be binding internally & releasing in spurts.
 

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Good timing for this to come back up, as mine is also jumping, occasionally makes some clicking noise or sits at 0. New mechanical MPH speedo & cable. The cable is Britpart & the square insert part that goes into my speedo is plastic. I figured it stripped out. It was in good condition when I checked it. It's not a loose connection at the speedo & fits tight. I'm thinking the cable must be binding internally & releasing in spurts.
Yes--jumping speedo is typically a binding issue. I have not seen one strip, but always possible!
 
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