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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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940 speedo suddenly working again after 7 years!Views : 261 Replies : 2Users Viewing This Thread : |
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Aug 23rd, 2019, 23:52 | #1 |
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Last Online: Mar 18th, 2024 13:17
Join Date: Jul 2008
Location: Henley on Thames
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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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[IMG]Volvo2 by Strider'swoman, on Flickr[/IMG] Current '96 945 2.3 lpt - Aurigas, tailgate spoiler, sports grille, lpg fuelled Previous '88 764 TD, '92 945 TD, '88 745, '81 244 DL |
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Aug 24th, 2019, 10:34 | #2 |
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Last Online: Feb 11th, 2023 21:32
Join Date: May 2010
Location: Blyth, Northumberland
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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. |
Aug 24th, 2019, 10:34 | #3 |
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Last Online: Yesterday 21:57
Join Date: May 2012
Location: Lakenheath
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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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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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