Barchetta Speedo problem
- Thread starter Daveiq
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Barchetta Speedo problem
Hi, and welcome,
speedo's tend to be driven at the gearbox, then the signal sent electrically to the speedo head in dash
either the sender is patch.. or it's an issue with the head,
:idea: try using a sat-nav at say 60 / 70 mph
does the odometer also read as if only 50mph is achieved..?
compare distances with sat-nav
the g-box sender is PROBABLY common to other FIAT's and therefore a LOT less grief to change as an experiment
( pretty sure a lot of the kit is the same as HGT Punto)
http://eper.fiatforum.com/eper/navi...INT_MODE=0&EPER_CAT=SP&WINDOW_ID=1&GUI_LANG=3
Charlie - Oxford
Hi
Thanks
I will look at the gearbox sender first.
The speedo registers from 0 and increases OK up to 50 then seems to get stuck. Then as I decrease speed and get below 50 it works OK decreasing to 0.
Hopefully it is the gearbox sender.
Where on the gearbox would I find it?
Thanks
Thanks
I will look at the gearbox sender first.
The speedo registers from 0 and increases OK up to 50 then seems to get stuck. Then as I decrease speed and get below 50 it works OK decreasing to 0.
Hopefully it is the gearbox sender.
Where on the gearbox would I find it?
Thanks
Might also be a cracked solder joint, my speedo did these kind of things before I resoldered the joints.
https://www.fiatforum.com/barchetta-guides/330307-speedo-repair.html
https://www.fiatforum.com/barchetta-guides/330307-speedo-repair.html
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gar074
Prominent member
I agree that a cracked solder joint (a common problem on the B) might be the cause, but more typically, doesn't it stop the speedo from working altogether? It's hard to see how a cracked solder joint would be sensitive to speed, to the extent that the speedo routinely stops working once you hit 50, and starts again once your speed drops below 50. Very puzzling. It's not something simple, is it, like some foreign body in there, physically preventing the speedo needle from rotating beyond 50?
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No they fail exactly like that, I can guarantee that there isn't any other problem!
The solder joints are crap in barchettas on speedos!
I have had 2 speedos fail on me...
It's a notarious problem for barchettas and it's nothing more than dried out /cracked solder joints in the speedo unit itself.
gar074
Prominent member
Have same problem, speedo sometimes just doesn't work. Can wake up in the middle of the drive, then die again after short stop.
Tapping never helps. Nothing seem to help, just wait and hope and it will eventually be back.
Resoldered all big joints a year ago, also changed speed sensor - still there
gar074
Prominent member
Mine always stops working when the car's been parked in the sun. Classic symptom of a cracked solder joint opening up due to heat expansion. It used to bother me, but now I just calculate my speed from the tacho. That way, I get to practise my mental arithmetic while driving, in an attempt (probably fruitless) to stave off premature senility.
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Mine always stops working when the car's been parked in the sun. Classic symptom of a cracked solder joint opening up due to heat expansion. It used to bother me, but now I just calculate my speed from the tacho. That way, I get to practise my mental arithmetic while driving, in an attempt (probably fruitless) to stave off premature senility.
Well, I could roughly tell my speed by how wide my grin would be, with "ear to ear" being around 150kph. But for city speeds, I need something more precise. And yes, I am senile and can't remember the tacho-to-speedo ratios
