Speedo probs

[mr9lt]

Has anyone on here ever sufferred from a speedo failure on a MK1. On a lovely sunny afternoon driving up the M5 in Somerset my gaze was drawn to an oscillating needle jumping between 0 and 200, a remarkable situation, 0-200 in milliseconds.

I presume there is a pickup under the bonnet or off the rear axle, any clues would be appreciated, just need to see if their is a dodgy connection or an earth problem.

Thanks for any advise in advance.
Mike

[Chim450]

Common problem with Tuscans. It is the speed sensor that is causing the problem, it is located on the rear axle and apparently can be cleaned. However I have had this a couple of times with mine and it has needed replacing.

Apparently TVR have modified this part so it doesn't fail as often, I have had no problems since it was last replaced 6 months ago.

[anonymous-user]

Transducer. Known problem. they are on about MK 5 so far. Costs about £70 if you have to pay for it. My first Tuscan had 3.

[oxbow]

mr9lt said:

Has anyone on here ever sufferred from a speedo failure on a MK1. On a lovely sunny afternoon driving up the M5 in Somerset my gaze was drawn to an oscillating needle jumping between 0 and 200, a remarkable situation, 0-200 in milliseconds. I presume there is a pickup under the bonnet or off the rear axle, any clues would be appreciated, just need to see if their is a dodgy connection or an earth problem. Thanks for any advise in advance. Mike

My speedo stuck at 101 a few years ago on Tuscan no:1. Mind you I had just gone thru a hedge and was impalled on a conifer at the time!

[anonymous-user]

oxbow said:

My speedo stuck at 101 a few years ago on Tuscan no:1. Mind you I had just gone thru a hedge and was impalled on a conifer at the time!

You nutter you.

[tuscan s]

mine has been in three times to be (fixed) it is fine when the car is cold but as soon as you do about 30 miles it starts to slip and wont go above 20 mph the led speedo is fine though, has anybody got any thoughts before i send it back. Thanks Gordon.

[OXBOW]

unrepentant said:

oxbow said: My speedo stuck at 101 a few years ago on Tuscan no:1. Mind you I had just gone thru a hedge and was impalled on a conifer at the time! You nutter you.

If you only knew?

[beano500]

OXBOW said:

unrepentant said: oxbow said: My speedo stuck at 101 a few years ago on Tuscan no:1. Mind you I had just gone thru a hedge and was impalled on a conifer at the time! You nutter you. If you only knew?

Sounds more like Room 101 than Speed 101

[mr9lt]

Thanks for the replies. Any idea where on the back axle would help. Have got neither display at the mo, so cant drive her until fixed.

[P6 TUS]

mine goes and then reappears..give it another go!

[mr9lt]

Sorted!!!! Blown fuse in the end, the mirrors not working was the clue! Now if only i could fix the fog light!

[delamars]

tuscan s said:

mine has been in three times to be (fixed) it is fine when the car is cold but as soon as you do about 30 miles it starts to slip and wont go above 20 mph the led speedo is fine though, has anybody got any thoughts before i send it back. Thanks Gordon.

This is sometimes due to the plastic of the display having been pushed back a touch causing the needle to stick. I have no idea how to fix it though

[cerbyt]

mr9lt said:

Has anyone on here ever sufferred from a speedo failure on a MK1. On a lovely sunny afternoon driving up the M5 in Somerset my gaze was drawn to an oscillating needle jumping between 0 and 200, a remarkable situation, 0-200 in milliseconds. I presume there is a pickup under the bonnet or off the rear axle, any clues would be appreciated, just need to see if their is a dodgy connection or an earth problem. Thanks for any advise in advance. Mike

My Tuscan S has the same. Started intermittently with the needle showing 0 , then 10 to 20 mph more than the lcd readout. Then they both started doing it. The needle also stuck occasionally. Fernies replaced the speedo "transducer" (i think thats what it was called!) behind the fuel tank and has been fine ever since. Part was £80 then labour ontop.

[flashgitindenial]

I had three or four replacement sensors on my mk1 S. Did I pay for them? No. If the part is faulty why should you?. No problems on my mk2 s after 6800 miles.