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  #1  
Old March 12th, 2015, 08:26 AM
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Speedo Surging

Yesterday morning I started my truck (97NAS) and before I began to back up the needle in my speedo surged from 0 to like 100 and then immediately came back to rest. WTF is about to go wrong?
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  #2  
Old March 12th, 2015, 08:34 AM
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Alternator has puked.
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  #3  
Old March 12th, 2015, 09:21 AM
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That was my first guess. I was hoping it was a loose lug nut or something.
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  #4  
Old March 12th, 2015, 09:27 AM
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Quote:
Originally Posted by 1of40 View Post
That was my first guess. I was hoping it was a loose lug nut or something.
Arlington Armature in Springfield can likely rebuild, otherwise Action Alternator is where Huff & I got our alternators from.
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  #5  
Old March 12th, 2015, 09:52 AM
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Quote:
Originally Posted by o2batsea View Post
Alternator has puked.
How does a bad alternator affect the speedometer?

I would check out the VSS.
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  #6  
Old March 12th, 2015, 09:57 AM
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What John said. The alternator would affect the Tach, not the Speedo. Check the VSS or the speedo cables at the VSS.
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  #7  
Old March 12th, 2015, 11:18 AM
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Thanks Gents
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  #8  
Old March 12th, 2015, 11:31 AM
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Quote:
Originally Posted by samer0214 View Post
What John said. The alternator would affect the Tach, not the Speedo. Check the VSS or the speedo cables at the VSS.
Does a 97 have any cables? I thought they used the direct mounted VSS. They are a simple reed switch. As it rotates, the switch is opened and closed and you can check it with a multimeter.
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Old March 12th, 2015, 11:50 AM
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Rovers North calls it a Transducer Speedo Cable (P/N: RNI618), but I think you're right, it's looks to be an electrical cable, as opposed to a mechanical spinning cable (PLE/RNE521) such as on the M/T D90 and D110.
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  #10  
Old March 12th, 2015, 12:23 PM
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http://landroverforums.com/forum/dis...em-help-55022/

This is a classic. I was searching for other possible discussions around the VSS or transducer and found this post.
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  #11  
Old March 12th, 2015, 12:28 PM
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Quote:
Originally Posted by 1of40 View Post
96 disco sputter problem help - Land Rover Forums - Land Rover Enthusiast Forum

This is a classic. I was searching for other possible discussions around the VSS or transducer and found this post.
I think a 97 is a bit different though. They have wheel speed sensors as well that report to the ECU. I'm not sure if the transfer case VSS is used by the ECU or just the speedo.

Earlier trucks, yes. The VSS signal tells the ECU to choose between two different idle modes. When it is not present, you tend to stall out when coming to a stop.
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Old March 12th, 2015, 12:28 PM
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Quote:
Originally Posted by 1of40 View Post
96 disco sputter problem help - Land Rover Forums - Land Rover Enthusiast Forum

This is a classic. I was searching for other possible discussions around the VSS or transducer and found this post.
OMG, that is hilarious.

Quote:
its been sitting for 2.5yrs i just got out of prison and need it to run
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  #13  
Old March 12th, 2015, 05:39 PM
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After Lunch Update: Speedo surged again 0 - 120mph with just the key in acc mode, before actually starting the engine. I stopped at acc mode this time and waited a few seconds. You could tell there were electrical pulses making the needle tick a little and then wham it surged to 120 and the back down to zero. No problem starting and no problem idling or when driving yet.

------ Follow up post added March 12th, 2015 05:46 PM ------

Quote:
Originally Posted by Red90 View Post
I think a 97 is a bit different though. They have wheel speed sensors as well that report to the ECU. I'm not sure if the transfer case VSS is used by the ECU or just the speedo.

Earlier trucks, yes. The VSS signal tells the ECU to choose between two different idle modes. When it is not present, you tend to stall out when coming to a stop.
John, if this is only happening when I turn the key on, before the engine starts and before I'm even moving, we're thinking this behavior on a 97 is more likely ecu related?

I'm so blessed that there's only 329 different things it could be.
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  #14  
Old March 12th, 2015, 05:58 PM
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I'm not sure how it is setup. Someone would need to look at a wiring diagram, which I don't have. Are you saying it is working okay when driving?
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  #15  
Old March 12th, 2015, 06:19 PM
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My '97 did the tic, tic, tic, wham to 120 & back to zero thing for years, from 2001 until last summer when I sent it into Hollywood Speedo to have the LCD trip/odometer fixed ($275). Hasn't done it since. I've heard this is the VDO speedo way of resetting itself.

But I do have an ongoing problem with the speedo needle going wonky/floating around but this must be related to my Alt. in my 300Tdi (2001 conversion here) this has been going on since 2001 too. What stops my "wonky" is to put an additional load on the Alt. by turning on my headlamps or the interior fan. Seems to occur more in cold weather than hot. But I keep a replacement Alt. on hand in case it fails altogether. In the dark, before shutting down with no loads, the Alt. lamp very faintly glows too.

PS. ALL my ECU component were removed in 2001, so the ecu being a factor in mine is Zero.
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  #16  
Old March 12th, 2015, 06:44 PM
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Viton. If you have a bad diode in the alternator fix it now. That will destroy every electronic device on your truck.
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  #17  
Old March 12th, 2015, 06:44 PM
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Ah, well that's a little more comforting to hear it might just be speedo related.

John, yes, no prob running.
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