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940 speedo suddenly working again after 7 years!

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Old Aug 23rd, 2019, 23:52   #1
Laney760
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Default 940 speedo suddenly working again after 7 years!

I am having an intermittent starting problem in my 940 which I am just about to raise a thread about. My car was having difficulty starting after work today, cranking without firing, so I decided to put back my old fuel pump relay which was in the car still since fitting a new one last October. The old fuel pump relay made no difference to the starting difficulty and the car eventually fired up, eliminating the fuel pump relay from the starting causes.

Anyway, my speedo has not worked since 2012. I returned the car to the seller shortly after purchase and he repaired the speedo by working on the circuit board behind the dashboard. His repair lasted a short time before failing so I have always assumed that the board was the problem BUT after inadventently moving some wiring in the vicinity of the relay / fuse board behind the ashtray today my speedo suddenly came to life after seven years and worked ALL the way home!

Perhaps someone can enlighten me as to how my wiggling the wires around in the area of the fuse / relay board has bought my speedo back to life, what might be the cause of the original problem please?
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Old Aug 24th, 2019, 10:34   #2
Ian21401
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Appears that there has been a poor connection somewhere in there which your rummaging has disturbed. If the speedo and other gauges continue to work satisfactorily leave it. If or when it stops working again then remove the instrument panel and check/clean all connections on the PCB and all the associated wiring and connections behind the centre console and dashboard.
If you do have cause to remove the instrument panel, check the PCB at the site of the capacitors for signs of capacitor leakage and “carefully” remove the small screws from their various locations on the PCB (one at a time), clean the PCB beneath the screw (with a non metallic abrasive) and replace screw. Cleaning beneath those screws cured a recurring problem on mine a few years ago. From my experience it is quite possible that you will not actually find the cause but you just may have corrected whatever the cause was.
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Old Aug 24th, 2019, 10:34   #3
Laird Scooby
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Have a look at your other thread about the starting problem Ellie, the explanation of the wire wiggling etc is in there and hopefully the answer to your starting problem too.
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