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Author Speedo dropping
Brett
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Registered: 16th Dec 02
Location: Manchester
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9th Dec 11 at 11:30   View Garage View User's Profile U2U Member Reply With Quote
Not my car, but help appreciated..

1.2 Corsa C

Works fine, but occassionally when driving the speedo will just drop down back to zero and stop working, but then pick back up again randomly.

Where should I start?

Cheers
Brett
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Registered: 16th Dec 02
Location: Manchester
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9th Dec 11 at 11:37   View Garage View User's Profile U2U Member Reply With Quote
...been told when it stops if you start smacking the dash then it comes back on? I'm guessing it could just be the cable to the back of the clocks then rather than at gearbox end?
Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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9th Dec 11 at 16:24   View User's Profile U2U Member Reply With Quote
i'm having a very similar problem with my mk4 astra, driving me insane, can't get to the bottom of it!
johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
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9th Dec 11 at 17:29   View User's Profile U2U Member Reply With Quote
Chances are it's electric in the C.

Hitting the dash would suggest a loose connection.

Otherwise i'd have thought the sender in the box was on way out.
Jed D
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Registered: 15th Mar 11
Location: Durham
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9th Dec 11 at 18:06   View User's Profile U2U Member Reply With Quote
mines been doing this lately. normally only does it when a drastic increase in speed whereas if you build your speed up gradually its fine lol
Joe
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Registered: 20th Jun 04
Location: Hesketh Bank, Lancashire
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9th Dec 11 at 18:27   View User's Profile U2U Member Reply With Quote
Take the dash panel out and clean the connections in the plug. Should sort it.
AlexW
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Registered: 25th Oct 08
Location: Essex
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9th Dec 11 at 18:44   View User's Profile U2U Member Reply With Quote
Clean connectors, on the car side plug and the dials.

Also be worth checking the plug is secure in the dash.

If not, speedo sensor.
XE Col
Premium Member

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Registered: 23rd May 10
Location: Rochdale, AKA:Boissy07
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9th Dec 11 at 21:23   View Garage View User's Profile U2U Member Reply With Quote
If it has an aftermarket hu they have a sensor wire that increases the sound with speed, if this is not connected as I don't think they work in vx anyway it may be touching the cage intermittently which would cause the speedo needle to drop, know from experience In my old mk4 Astra, worth a look
Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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11th Dec 11 at 13:33   View User's Profile U2U Member Reply With Quote
any idea what colour the wire is? and i presume its on the car side of the loom?
XE Col
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Registered: 23rd May 10
Location: Rochdale, AKA:Boissy07
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11th Dec 11 at 13:38   View Garage View User's Profile U2U Member Reply With Quote
Not sure what colour was and no on stereo side of loom
Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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11th Dec 11 at 16:34   View User's Profile U2U Member Reply With Quote
brown wire finally sorted mine, thanks for the advice
XE Col
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Registered: 23rd May 10
Location: Rochdale, AKA:Boissy07
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12th Dec 11 at 10:58   View Garage View User's Profile U2U Member Reply With Quote
Brown wire yea that's it had me confused for ages how it would work then suddenly go off, about 4 months before I realised it was only when I put the stereo front on
Brett
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Registered: 16th Dec 02
Location: Manchester
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12th Dec 11 at 14:07   View Garage View User's Profile U2U Member Reply With Quote
Wow, at least someone's sorted Well done Col, had never even heard of that. Will deffo investigate that.

 
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