VDO Speedo help - Defender Source
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  #1  
Old October 24th, 2010, 12:44 PM
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Tim Blanco
1994 Defender 90
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VDO Speedo help

I recently install the programable VDO speedo with Hall sensor in my 94 d90.

I had a custom cable adapter made for the Hall sensor (as per the faq) so that's fine. I went through the calibration process which went without issue.
The problem I am having in the speedo does not stay at a smooth reading and tends to fluctuate + or - 5mph for any given speed. In other words, when i am traveling 50 mph, the speedo will bounce between 45 and 55mph. The higher the speed, the more the speed fluctuates.

The original speedo was bouncy as well but the new VDO unit is much more pronounced.

Any ideas where I should start looking? Speedo gear? Secondary speedo cable?

Any ideas would be appreciated!

-Tim
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  #2  
Old October 24th, 2010, 02:16 PM
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Randy
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Prob the cable.. That's why its better to just use the electronic sender direct into the t-case..
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  #3  
Old October 24th, 2010, 03:08 PM
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Bill Lewis
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I had the same problem. I found that the clip that holds the speedo gear in the tcase(gear box?) was loose. I had to remove it and put a slight bend into it to hold that end of the cable tighter. I cleaned up a lot of the fluctuations but I sometimes still get few. Also, it helped to make sure the hall sensor is secured tightly to where you mounted. Mine was on the frame rail.

I would love to go to the electronic sensor. Can that be done?
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  #4  
Old October 24th, 2010, 05:43 PM
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Tim Blanco
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I need to double check that clip but the first time I looked, it was in there pretty good. It's more of an annoyance than anything else.

The electric sensor would be nice but I read that there were issues with the 94 D90s with the 2 speedo cables....
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Old October 24th, 2010, 06:10 PM
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Don Bunnell
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Just did my speedo change too. Same thing with the bounciness. I Went the Hans Method with the CJ7 cable. The stock cable seems a little tight/sloppy and the Jeep cable replaced that. Like Randy said you can swap out the VSS with an electric one but I was worried about leaving the wire that talks to the VSS on the '94 & '95s

Anyway's I buttoned everything up and it was doing what you described after I tried calibrating it. I then thought - must be the old lower cable (from the T-case to the VSS). Ordered a new one from Atlantic British and when I went to swap I found the old one fit way better and was silky smooth. Like kolvedic said, my clip was loose coming out of the t-case. I think it might have cause a bit of leaking as well. Took it all apart and it seems someone put that clip on backwards. I swapped it around and things felt nice and tight - (and still looks clean in that area).

Then I took the dash apart and looked at the sender and while drving it spun nice and smooth. Recalibrated again using a GPS and going 1 mile. Still jumping. I then just started entering pulse numbers and right now I'm at a point where it's just 2 mph faster and the odometer seems very close with very very little bounce. When I feel like it I will play around with the pulse numbers and see if I can get it to match the GPS although I am wondering if the GPS might have a +/- mph tolerance to it too.

As a side note, it could also be the speedo needle. I am not sure how it works but maybe just driving it "loosens" it up.
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  #6  
Old October 24th, 2010, 06:34 PM
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Tim Blanco
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All good info....thanks.

I would think that the using the 'drive one mile' verses entering the pulse numbers would provide the same speedo needle behavior.
I should probably try and concentrate on the clip/lower cable. My hunch is that the problem is there.

tim
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  #7  
Old October 24th, 2010, 10:16 PM
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John B.
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Probably the cable.

BTW... The pulse settings set the odometer. This is what should be set to match the GPS. The speedo needle setting is separate if it is found to differ from the odometer.
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