Speedo not working below 20 mph

[scuzzmcmatt]

Hi guys, anyone no a quick fix for speedo on my chim, doesn't work under 20, once over 20 flicks up and works?! have cleaned the sensor, but hasn't made a difference - any ideas?!

cheers
matt

[Slacey]

Mine has started doing exactly this, also interested in a fix!

[pilgrim13]

This is usually a pre-cursor to it packing up completely, its a fault inside, exact same thing happened to mine, its at Speedy Cables being repaired at the moment, they quoted around £70 to £80 but unfortunately with a 25 day turn round. http://www.speedycables.com/instrumentrepairs.htm

[Ikky's tvr]

mine does exactly the same, but when asking other owners they said they all do this....very common if not normal.

[lesstatt]

Yeah mine does too, it just drops to zero under 20 ish

[BryanWilton]

Mine used to do exactly this
Your speedo sensor unit probably needs the gap adjusting or replacing (about £65)
I suggest getting the TVR 'Bible" as it shows what it looks like & where to find it

Its under the car unfortunatly, I did mine off axle stands with chocs at the front
Takes about an hour once the car is in the air (it is in an awkward place)

[davidindevon]

Yes just as Brain says, nothing wrong with the speedo, adjust air gap on speed sensor. Fixed it for me but you may keep getting the problem returning until you replace it.

[pilgrim13]

I had exactly this problem, took it to David Batty, he checked it out and said it was the speedo head. Tried another speedo head and it worked. Mine now being repaired.

[thenick]

Mine's done this since I got it. It hasn't got any worse but only does it below 10mph, if its the air gap I might well have a look next time I'm under the car as it is a bit annoying sometimes!

[Colin L]

Sorry, but what you doing going that SLOW!!!!!!!!!!!!!!!!!!!

It works better when you use the right foot!!!!!!!111




Well some one had toooooo say it

Colin L

[thenick]

Well said that man!

[edward1]

Mine currently does this up to 40 which is a tad annoying. It has done this before coinciding with the diff being out. It normally just needs the gap adjusting, I've just been too lazy to get around to it. would rather drive the car than lie underneath it!

It could be a sign of the sender being on the way out as it seems to need a v small gap to register lower speeds, don't know what the "correct" gap is though.

[chim666]

Ikky's tvr said:

mine does exactly the same, but when asking other owners they said they all do this....very common if not normal.

Mine too...and I've had a new sensor when the old one failed totally (it was only registering above 20 on the old sensor), and it's adjusted corectly - it's not really a problem.

Edited by chim666 on Monday 4th August 18:44

[BryanWilton]

The gap is really critical & has to be very small
But if you make it too small it grinds on the cogged wheel thingy when you get the car back on the ground.....
Been there, done that

[shpub]

http://www.pistonheads.com/gassing/topic.asp?h=0&a...