E30 Zone

when i accelarate the speedo reads 0 mph, then when i take my foot off the accelarater the speedo gives the true reading, have i got a dodgy earth or is the speedo cable on its way out?

thanks

Alex

They don't have a cable they are elcetronic.
What you describe is a common problem.
The sensor for the speedo is attached to the diff and the wires going to it go brittle.
The best thing to do is to replace the wire (2 core) as far back as you can go which should be around 300mm.

^^^^^^^as above just done mine

Dude you can buy replacment conectors from Bmw with a good length of wire

junkjimmy wrote:Dude you can buy replacment conectors from Bmw with a good length of wire

I'm just about to do this so i've got the part # below

Plug housing 61 13 1 378 417
2 x cable socket 61 13 1 382 246

could this problem occur if my diff was on its way out because mine is

Nothing to do with failing diffs. You can use a length of wire and plug from the headlamps of a scrap E30 if you're too tight to buy new.

il just buy new its easier