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MG ZR ZS ZT Technical - Jumping ZR Speedo

My 10 week old ZR105 has developed a curios problem which is stumping my local dealer.
The speedo has developed a mind of its own - sometimes showing 110mph when I'm stationary!!!!
My local dealer has tried a new speed transducer - new speedo & run a diagnostic on the wiring which shows everything as being OK.
Has anyone else come across this before? If so what was done to fix it?
Thanks in advance.
Steve Preston

Dont know what method is used to drive the speedo on Fs but what you describe could be due to a worn/broken speedo cable with stray strands catching within the outer cable. This does happen on other cars ... maybe the F too if it uses a similar set-up.

John
John McFeely

I believe that the Zeds use an electrical signal to drive the speedo (no traditional cable). Could be down to that old favourite, a bad earth somewhere.
JLD

JLD is correct - it is electrically driven, however the dealer checked the earths & these all showed as ok.
S Preston

have you had an after market radio fitted? we had this problem in my dealership. the radio was speed sensitive (the volume turns up the faster you go) if you have try disconnecting the radio and see if the pronlem goes away.
ricky (tech)

Just to let you know it eventually turned out to be water getting into the speedo transducer (4th one they fitted).

I've got so tired of the whole thing really - had the car 3.5 months and not been able to drive it, legally at least, for over a month of that time.

I'm part exchanging it for a TF, it may be as unreliable as the ZR but at least the roof comes off!! 4 weeks and counting until the TF gets delivered.
S Preston

"Glutton for punishment" comes to mind :-(
Arsebiscuit

This thread was discussed between 18/04/2003 and 01/06/2003

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