Porsche Enthusiasts Club Forum

the speedo on my 1985 s2 has become very tempremental,some days it works after 2 miles or so,others 15-20 or not even at all,then the next day it will work again just as above,anybody come across this before? regards d.h

Hi

Mine used to do that just after I bought it...lack of use i think....

Try this....next time it doesnt start as soon as you move....CLOUT the speed hard lol...

It worked for me and after a couple of weeks it seemed to cure it....very occasionally it happens now (maybe 3 times a year)

But I have a digital speedo now so it doesnt matter...

All the best Brett

Maybe you need to replace the speedometer cable? they can become frayed and then twist until it starts working again - causing it to work erratically.

are they electric or cable?its the 928 by the way!

Oh sorry, I just checked Pelican Parts and...

928's have electronic speedometer which requires this sender. If your gauge dies completely, then be sure to check this sender first. 928-606-210-00-M100

My first 944 s2 did the same, it was a cheap fix, just the sender unit, i did not replace it myself as it was done with other mot work so i dont know if you can do it on your drive.

Hi

I cannot be sure but i dont "think" its the sender....my impression is that its the needle itself sticking....

All the best Brett

Well, you could take the instrument cluster out and give it a clean somehow, maybe use a vacuum as it may have some dirt making the needle stick and use a bit of GT85 spray?

God, I need to stop writing on here and get myself outside working on my own car, lol

Likeliest cause is edge connectors at base of pod getting dirty. I think on earlier 928s you can just reach them from underneath, disconnect and then clean the contacts. I would use contact cleaner on a cotton wool bud but others have used pencil eraser.