My uno 1.0 ie start has developed a problem.
Started off that it was bogging down and cutting out. Fixed that problem with some good old redex. Now its started having a really high idle speed. Mega racing, and when im going along i sometimes dont need to use the pedal! Cheap cruise control! Lol.

Anyway, i was looking around on the forum and a few people had the aamw sort of problem and found that it was some sort of sensor. On the right hand side of the carb i think? I have disconnected it an it seems ok for the time, but i dont want to leave it off.

What is this sensor? Whats it for? And most importantly, where can i get a new one?


Thanks

That´s no carburettor, it´s a BOSCH or Marelli SPI (single point injection).
The " sensor" is a potentiometer which gives the motor management a signal about the angle of the throttle butterfly. These potentiometers wear out and everything goes wrong. Try to get a working SPI, new ones are very expensive. You´ll have to reset
the motor management after replacing the unit.

Yo Spikey, like the above poster says, if its a 1.0 ie - its the injector, not a carb

I made that mistake when I first got my car too


Sounds like the timing is a little wonky - try turning the distributor a little (on the right of the engine block, at the top, has all the spark leads going to it.
Don't just turn the cap, turn the entire unit.
You'll need to undo 2 nuts a little first.

Thanks. Will give it a try tomorrow. I think the main problem is the lambda sensor, when i unplug the connector and plug it back on it sorts it but only for about half hour. When im at the rents house next will take it out and check it as i dont have a spanner large enough in me box.

Its the thing sticking out of the down pipe at the front? And if it needs replacing, does anyone know if its a 3 or 4 wire i need?

When you disconnect the lambda sensor, the MCU will set that signal to an average level. The MCU a self adjusting system with a wide range.
High idle speeds are usually due to leaking hoses and seals.
The system gets more air and the MCU will try to reach a stoichiometric mixture which leads to a high gas level with resulting high idle speeds.
Try to find leaks and worn hoses first by spraying break-cleaner
on the engine. Then the idle changes you have found the spot.

Ucof said:

Sounds like the timing is a little wonky - try turning the distributor a little (on the right of the engine block, at the top, has all the spark leads going to it.
Don't just turn the cap, turn the entire unit.
You'll need to undo 2 nuts a little first.

Click to expand...

Good advice but I suggest marking the position of the distributor first, so you can return to that position if there is no noticeable improvement - otherwise the timing really will be wonky if it is currently correct

-Alex

yeah, the timing was ok, when i changed it it was weeeelll off! lol

but im gonna change the lambda sensor see if that makes a difference, its easy enough to get to.

but have another problem, clutch has gone now, so down to mr clutch for a new one! hopefully its only the release bearing thats gone, wont need a whole new clutch then

Did you get this problem sorted?
I've got the same issue, which is causing the engine to overrev and burn through fuel at an ungodly rate. It pretty much drives itself.

I'm going to try and reset the ECM.


Steve

errmmmm, not yet no. I got a new lambda sensor and fitted that, problem fixed for one drive and its still doing it.

I reset the ecu and that did nothing, the next thing i need to try is a new vaccum advance capsule and pipe, but i have no idea where to get one from!!!(if anyone can pop in a link that would be brill ).
Then if that doesnt work then maybe a new throttle cable, could maybe a small kink in that somewhere down the line.

ohai!
I r has linkzor!

http://www.shop4parts.co.uk/?name=store&op=Details&ProdID=1184&sku=3752

Brilliant! Nice one, cheers

Seen the "Thumbs up" on my post? If you press it, your computer prints banknotes!

You will also want this wonderfully excellent post, which was actually voted the best thing in the world, ever, in a recent poll: https://www.fiatforum.com/uno/200150-day-i-changed-my-o-ring-diaphragm.html?p=2153387

Ucof said:

You will also want this wonderfully excellent post, which was actually voted the best thing in the world, ever, in a recent poll: https://www.fiatforum.com/uno/200150-day-i-changed-my-o-ring-diaphragm.html?p=2153387

Click to expand...

LOL, such modesty!

-Alex

urgh! empty promises!!!! no bank notes came out. haha

Please try turning your PC off and then on again.

problem found!!!!

its the stepper motor, need a new one.

had a look round on tinterweb but cant seem to find any new ones.

any ideas?

by stepper motor do you mean this?



don't have one just wondering because i also have fast idle speed problem.

That isn't a motor.
It's just a tube through which the accelerator cable passes, which controls how open the inlet into the injection unit is.

For the fast idle problem, just try slacking the wire a little using the two nuts on the other side of that metal tube.

that's not actualy mine, will take a photo of mine then, anyway, didn't mean the tube but that plastic unit under the tube. but now that you mentioned the tube i can see some differences between mine and this one...

The one on the picture is a WEBER SPI
The other ones that were used are from BOSCH