993 TT Speedo/ Wiring/ Senders

[symsy]

Hi

Does anyone have any experience with the wiring for speedos.

I had a glitch with my 993 some three years ago and then it went away after two weeks.

I recently noticed something similar again.

The car has been stored and started and driven probably monthly only for 10-15 mins over the last few years.

Anyhow at first I lost the speedo , but the milage ticked over . I had the speedo checked at porsche , they said maybe replace , i sent it to a vdo guy and he said there was no problems. I sprayed it on the back with circuit board cleaner put it in and straight away no problems.

So again 2 years later I now have the speed showing and no other errors but in my last trip out the mileage stopped ticking over. I drove 20 mins and then started the car again and then it worked. Very irractic.

So im not an electrical expert and the dealers i deal with which are 2-3 hrs drive away from home , just want to change everything and do no fault finding.

Does anyone know what the four pins top to bottom on the connector relate to as in function on the speedo.

I am not so happy to crack open my speedo as it still has all the seals and the car has a legitimate history etc etc and then again , I see it pointless to replace everything for a irratic fault , not mentioning an expensive exercise. The porsche team dont seem to have the electrical skills to find the terminations and validate the wiring harness is intact and that the components individually function.

Has anyone else had any issues with senders etc , does anyone know the broad setup or where I might check simply for connections etc that may have been dislodged or got some gunk on them?

Again , I have all the errors lights working ok etc etc

I would love any info or support piccys too if you have them. i get a hunch its a dodgy contact or something, or as I live in the country I may have had a visiting mouse or something. my car is like 70,000kms so i doubt it wear and tear.

My email is [e-mail] if its easier to respond.

Thanks in advance for any advice

[cragswinter]

As far as I'm aware it's a plastic gear issue in the speedo itself, for obvious reasons people aren't keen on discussing in an open forum

If you do a google search for "993 speedo failure" or "993 odo failure" you'll find a few threads from over the pond.

One on rennlist has a step by step but iirc it's fairly complicated/fiddly. Also bear in mind that the recognised specialist is over in California so if you want it repaired it may take a while/cost a fair bit.

[HPandSpam]

Mr Cwinter is correct I think.

I had the odometer fail, initally a sporadic failure then permanent.
While most of the 993 is well over-engineered the speedo is a bought in unit.
VDO use cheap plastic cogs inside the unit which degrade in time causing them to shed teeth. I had mine repaired by a local company that specialises in tachometer repairs, the part itself costs pennies, I think the whole job cost me less than €100. A new speedo unit was quoted at over €1300!
I am sure there are plenty of companies able to repair instruments in the UK, good luck.

Cheers

[symsy]

Thanks , all makes sense , now to find a VDO repair guys with parts in Australia

Does anyone else know if the 993 non turbo clock will work in the turbo

I have a friend in another state and could try it I guess just to be sure its not anything else

Thanks

[aceparts]

A company in london called 'speedy cables' used to have all the parts to fix them.

[HPandSpam]

Quick search turned up these chaps http://ottoinstruments.com.au/repairs.htm

I'm sure that there are plenty of others around Australia. The part that needs changing is a a very basic toothed gear that is not specific to VDO so can be sourced easily from mechanical/electrical parts suppliers.