Technical Cinquecento carb

[Paul64]

I have a 1995 Cinquecento with the 700cc 2 cylinder engine - from the 126 I guess??
It's a pretty good motor for what I need around town and I just did a 400km trip today with no problems at 60 to the gallon!
The engine at idle is a little rough and perhaps turns a little slowly and it hunts slightly as well in quite a rythmic way...
Once the throttle is open, it's fine so I am leaning towards an adjustment problem rather than anything more serious. There are lots of adjustments on the carb and lots of vacuum lines - does anyone have a diagram of the carb and a basic setting up guide??

Thanks for any help!

 

[arc]

hi

the 704cc cinquecento is very rare in this country, the 899's and 1108s all run electronic ignition. as a result, we're probably not the best people to be asking.

the early pandas and unos ran carbs, and might well be very similar to what the 704cc runs - might be worth checking in those sections?

 

[rallycinq]

Are you sure its a carb, My manual shows a TB for a 704cc.

Cheers

D

 

[cc1]

Which carb is it? Weber 30 DGF 7/750 or FOS 30 S2HX?
The FOS 30 has a diafram housing on the side.

 

[Paul64]

Not sure to be honest - I'll check out the carb properly this evening.
I just found the oxy-sensor connector shorted out, no doubt that would have some effect on the poor running....

 

[arc]

and would mean theres no carb.. o2 sensors aren't used on carb'd engines.

 

[J333EVO]

I was looking at the Fiat workshop manual the other day and there is near 20 pages dedicated to the CARB on the 703 model and how to set it up, looks like Webber unit.

 

[custard]

maybe of help
https://www.fiatforum.com/cinq-sei-technical/71818-auto-data-cinq-1992-1997-a.html