Need Help! Mk1 Fiesta - Ford Fiesta Mk1 / Mk2 / Mk3 Forum - (1976-1995) - TalkFord.com

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Need Help! Mk1 Fiesta


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#1 robeish

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Posted 02 June 2012 - 09:18 PM

Hey,

My 1981 1300 fiesta ghia is pissing me off!
It is over-fuelling I think because it kind of runs when high revs but will not run at low revs. Just sound wave cleaned the carb and fit all new parts from a carb kit, but it's just as bad.. The carb is from an xr2 but it was fine for about a year and now all of a sudden it's gone! There is a brand new weber carb for it on eBay but before I spend anymore money on carb I wanted to see if anyone knew if it might be something different!

Would appreciate any help anyone can offer a lot!

Thanks,
Rob.

#2 siruncle

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Posted 02 June 2012 - 09:52 PM

an xr2 carb will overfuel, as xr2's are 1600's, you'd need to fiddle with the fuel/air mix to get it to work, i presume you're all connected back up correctly and you have replaced all gaskets etc with new ones after cleaning mating faces,

were the parts in the carb kit correct?

when you say it won't run at low revs you mean it won't idle at all on its own?
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#3 robeish

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Posted 04 June 2012 - 10:21 AM

Yeah the gaskets have all been replaced and the everything looks as it should. Thats why it's frustrating that it isn't working! Do you think getting the correct carb would sort the problem?

Thanks for your help

& no it won't run at idle at all anymore

#4 SoundsDigital

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Posted 04 June 2012 - 10:35 AM

The original carburetors gave lots of problems. We used to replace them with Weber carburetors all the time. Never had any acceptable results overhauling the Ford carburetors.

#5 nilagin

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Posted 04 June 2012 - 11:07 AM

The original carburetors gave lots of problems. We used to replace them with Weber carburetors all the time. Never had any acceptable results overhauling the Ford carburetors.

I thought all mk1 1.3 Fiesta's had weber twin chokes, my '81 1.3 GL did. Only Ford carbs that I'm aware of being a problem and people replaced were the VV carbs which were single choke and if I remember rightly were used later. MY '85 1.6 Capri had one.
robeish is your fiesta engine modified in any other way? I wouldn't have thought an XR2 carb would be ideal and prone to over fuel anyway as it is jetted differently to what you should have. I'd stick to what is supposed to be on the car unless the engine is modified.

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#6 robeish

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Posted 04 June 2012 - 12:53 PM

Yeah they are twin choke as well as the xr2.. It's just odd how it worked perfectly for the whole time I've had it and now all of a sudden it won't even start...

Guess I'll try a correct second hand carb & if that don't work it's getting a zetec!

Thought old cars were meant to be simple!!

#7 siruncle

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Posted 04 June 2012 - 01:48 PM

don't forget though, going zetec creates problems... no more points condenser and dizzy... fuel pumps are electric...

i'd try the carb first, at a scrappy i'd be looking at £5-10 tops.
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#8 harby

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Posted 12 June 2012 - 12:22 PM

Sounds like the idle jet circuit is either blocked or over fuelling, the XR2 carb works fine on the 1300 with just a bit of fine tuning, I've done it to a few 1300's. If you've recently cleaned it perhaps a bit of sediment has loosened off and blocked a jet or air bleed?

The other thing to do at the same time is the timing, is it a later model with the contactless ignition or older with points?
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