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  #1  
Old 05-31-2017, 01:53 PM
norman.vantuyl norman.vantuyl is offline
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Speedometer not working

Any advice why my speedometer is not working? What can I do to fix it?


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  #2  
Old 05-31-2017, 02:19 PM
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vintage42 vintage42 is offline
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There is a sensor on the differential that works the speedo, among other things. It could have become unplugged or gone bad.

Last edited by vintage42; 05-31-2017 at 02:23 PM.
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Old 06-01-2017, 12:52 PM
norman.vantuyl norman.vantuyl is offline
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I replaced the sensor already but before I assemble the car, I wanted to make sure other common issues might be the cause. Thank you for you advice, much appreciated.


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Old 06-01-2017, 02:49 PM
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vintage42 vintage42 is offline
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So the only thing in your cluster that is not working is the speedometer, after you replaced the speed sensor on the differential? That sensor also works the cruise control.
You could try a cluster test to see if the speedometer moves.




Last edited by vintage42; 06-01-2017 at 02:51 PM.
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  #5  
Old 06-04-2017, 12:55 PM
norman.vantuyl norman.vantuyl is offline
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Speedometer inop

I replaced my speed senor on the differential and did the cluster test. No luck, it did not work during test. Any other ideas to resolve my inop speedometer?
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  #6  
Old 06-04-2017, 08:04 PM
Blacklane Blacklane is offline
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What part of the cluster test failed? All of the cluster? Then you probably have a blown fuse. Speedo failed? Then you have a bad cluster.
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Old 06-04-2017, 11:27 PM
norman.vantuyl norman.vantuyl is offline
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Speedometer inop

It was the speedometer that failed. Any idea what a cluster costs and where I can find one?
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  #8  
Old 06-05-2017, 03:34 PM
Blacklane Blacklane is offline
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There are several on-line shops that repair speedometers. I would try one of them. I can't recommend one since I have only needed to repair a GM speedo, but it was a good experience.

BTW: Remove the cluster by tilting it into the steering wheel, then turning the wheel towards the driver's door.
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Old 06-06-2017, 11:44 AM
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Try this: when driving, smack the top of the instrument cowling with your hand and see if the speedo comes back to life. I wouldn't suggest it if I hadn't seen it work. Chances are you need some solder re-flowed. Contact North Hollywood Speedometer. You will have to send them your cluster but they typically charge a flat rate on the order of $179.
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  #10  
Old 06-10-2017, 06:33 PM
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alcofribas alcofribas is offline
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Z3 gauge cluster problem

I went through the same thing, although in my case it was a flaky tachometer, which, as noted in an earlier message, would work once I pounded on the gauge cluster pod.

I sent my cluster to a place in California that advertised gauge repairs. They indicated they put the cluster on their test bench and found nothing wrong with it. Hey, I wouldn't have sent it to you if there were nothing wrong with it!!! So I paid the required $100 and got my cluster back.

In the meantime I found a good used cluster with all gauges working. From my original cluster I removed the coding plug, then inserted it carefully into the replacement cluster. The coding plug tells the various engine components the number of cylinders to expect, the type of transmission, etc. Photo of the coding plug:



The "new" cluster works perfectly, but the downside is the presence of a "tampering dot" next to the mileage readout. That indicates the current gauge cluster is not the one "married" to the car at manufacture. My complete CarFax record indicates to anyone interested that the mileage shown on the odo is correct.

Last edited by alcofribas; 06-10-2017 at 06:34 PM. Reason: correct URL of photo
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  #11  
Old 06-11-2017, 07:39 AM
norman.vantuyl norman.vantuyl is offline
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Inop Speedometer

I discovered an interesting fix with my cluster. It goes right with you guys saying to pound on the dash to get it working again. I disassembled the cluster and pulled out the coil that is located just under the face of the gauges. I cleaned all contact underneath the gauges and reassembled. The cluster worked after that. The problem wasn't that the cluster was broken, it just had bad connectivity at the gauge coil underneath the cluster face. If anyone has this kind of problem, I recommend cleaning all electrical points in the cluster and retest. Hope this helps.
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