Hi I have a xj40 1990 and for some reason the speedo keeps on breaking down, i could be driving down the road and then all of a sudden it goes off with just the rev counter worker. It sometimes comes back on ten minutes later or to get it back on straight away i have to bang it hard on top of the dash board, but sometimes it does not come back on.

Can anyone please let me know what the problem is, as the garage could not work it out

many thanks

 

Hia! I am new to the forum so sorry that I could not see this post sooner.

I had a problem too with my speedo. When I first got my beauty her speedo didnt work under 30MPH, then it also stopped working (the speedo would plummet to 0) when I accelerated harshly, then it stopped altogether.

I took the speedo sensor out and it was covered in crud, so I cleaned it. It then worked again. Then with a month or two the thing above happened again.


So I replaced the speedo sensor and *touch wood* she has been fine since...

Worth giving it a clean before forking out for a new one. I was lucky and got a good one second hand. I am in the middle of writing up a help manual on how to access/clean/replace the speedo sensor. I can send it to you if you want, but I dont have the photos yet...I should get some at the weekend if you are willing to wait??

Good luck!!

 

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