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Automatic Speedo wrong

Forum Technical Electrical / Lights / ICE

 

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c_doughty1
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 Postby c_doughty1 »Tue Jul 03, 2018 11:34 am

Ok so driving in a 4th gen auto 2.2 the Speedo sometimes works but the mph reading is way off. Say I'm doing roughly 30mph it will think I'm doing 50 to 55 mph. Or it won't work at all and the needle goes all the way to the right hand side. The car is an import and some mph clocks have been installed but I think by someone that didn't know how to do it correctly. Advice anyone please.

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 Postby sol-lude »Tue Jul 03, 2018 11:42 am

either the conversion chip is gubbed happened to me before or VSS

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 Postby arif_manji »Tue Jul 03, 2018 2:05 pm

sol-lude wrote:either the conversion chip is gubbed happened to me before or VSS


I had the same issue and it was the converter. I removed it, re-soldered the wires back and installed a UKDM speedometer.
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c_doughty1
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 Postby c_doughty1 »Tue Jul 03, 2018 6:46 pm

I don't know what either of these are or what they look like?

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 Postby Vtecmec »Tue Jul 03, 2018 11:07 pm

After market convertor boxes are usually fitted behind the clocks or at the VSS in the engine bay. It'll be a little black box with about 5 coloured wires coming from it.

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 Postby sol-lude »Wed Jul 04, 2018 10:39 am

If it has EL dials it may not be behind the speedo, found the one on my BB4 the other day lurking behind the ashtray.

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c_doughty1
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 Postby c_doughty1 »Thu Jul 12, 2018 3:22 pm

Does anyone have any pictures of this Conversion Chip?

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 Postby newkid »Thu Jul 12, 2018 3:38 pm

If its proper mph clocks there won't be a converter.


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