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Author Topic: Fulvia 1.3 firing badly  (Read 4284 times)
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HF_Dave
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Posts: 489


Rust , What Rust !! I don't See any rust !!!


« on: 08 May, 2019, 08:41:37 AM »

My Fulvia has developed a miss fire  below 2000 rpm , it seems to run rough until it gets over 2000rpm , I've checked the leads ,they seem to be ok , I replaced them 3 years ago , would it be a plug fouling of a carb problem  ?  Huh? Thanks David
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My Current Cars:

1991 Thema station wagon
1989 Thema 16v
2011 Lancia Delta 3

1977 Beta sedan 2000
1975 Fulvia S3 1.3
1973 Flavia HF 2000 Coupe
1972 Fulvia S2 1.3
1989 Thema 8.32
**Other Makes**
2018 Alfa Giulia
1999 Alfa 156
2009 Fiat Du
Richard Fridd
Permanent resident
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Posts: 3430



« Reply #1 on: 08 May, 2019, 09:09:40 AM »

Could it be to do with the idle jets?
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Richard Nevison Fridd                                                                      Happy Lancia, Happy Life
lancialulu
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Posts: 4902



« Reply #2 on: 08 May, 2019, 11:21:43 AM »

Hello Dave

Could be a few things but worth changing the plugs to Iridium type first.

Tim
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia Sport 1600
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
HF_Dave
Megaposter
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Posts: 489


Rust , What Rust !! I don't See any rust !!!


« Reply #3 on: 09 May, 2019, 06:29:50 AM »

I presume the idle jets if they are blocked  would cause the misfire  ? It runs like a tractor  up to 2000 rpm . Can the jets be blown ou the with air ?
I'll check as the the plugs  first. The weather  was bad yesterday  evening  and I didn't get a  chance  to look at it . Thanks for the advice. 
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My Current Cars:

1991 Thema station wagon
1989 Thema 16v
2011 Lancia Delta 3

1977 Beta sedan 2000
1975 Fulvia S3 1.3
1973 Flavia HF 2000 Coupe
1972 Fulvia S2 1.3
1989 Thema 8.32
**Other Makes**
2018 Alfa Giulia
1999 Alfa 156
2009 Fiat Du
lancialulu
Press Officer
Permanent resident
*****
Posts: 4902



« Reply #4 on: 09 May, 2019, 07:35:39 AM »

The idle/slow running jets and also the main emulsion tubes (2 of each per carb) are accessible from the top of the carb. Best take the whole top off so you can see if you have a lot of crap in the float chamber. If it looks like you have best to take the carbs off and strip them and blow everything through with an air line......
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia Sport 1600
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
Richard Fridd
Permanent resident
**
Posts: 3430



« Reply #5 on: 09 May, 2019, 07:58:03 AM »

I have used carburettor cleaning solvent for the jets, to clear them of petrol deposits. A small ultrasonic cleaning tank is also useful. To find out which cylinders are not firing properly perhaps remove one HT lead at a time and see if the idle speed alters. Or wind the idle speed screws in and out to see what effect those have (mark original position first). If any of these things have no effect, that could be where a problem lies. A temperature meter could be used on the exhaust manifold branches (cooler=not working so well) Better weather now I hope.
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Richard Nevison Fridd                                                                      Happy Lancia, Happy Life
simonandjuliet
Permanent resident
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Posts: 2538



« Reply #6 on: 09 May, 2019, 08:25:21 AM »

Another thing to check are the screws holding the venturis. You can check by removing the air filter box and trumpets and then see if you can wiggle the venturies with your finger - if you can move them then tighten the screw and lock nuts on the side of each choke tibe
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AmilcarCGS, ApriliaCabrio,S2Aprilia,Ardea c'cino,S4 Ardea, Appia c'cino, Appia f'cino,B20 s4,4 R4 Sinpar, R4 Rodeo, 65 Moke, 2xR60 Tractor, 2xToselli 78, Moto Guzzi Ercole, Disco 3, Mini ALL4 JCW, Moto Guzzi Cardellino, Fulvia GT, RE Himalayan, Ypsilon
lancialulu
Press Officer
Permanent resident
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Posts: 4902



« Reply #7 on: 09 May, 2019, 09:34:59 AM »

I tried this Wurth stuff on a car that had been standing some while that would not run cleanly low down. Cured it.

This snake oil can do 3 Fulvias....

https://www.ebay.co.uk/itm/273808923875?ul_noapp=true
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia Sport 1600
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
HF_Dave
Megaposter
*
Posts: 489


Rust , What Rust !! I don't See any rust !!!


« Reply #8 on: 11 May, 2019, 06:08:28 PM »

I got the chance to have a go at the Fulvia today and it's sorted . I took out the idler jets and there was a bit of black gunk on them I gave them a clean , one at a time . I sprayed some carb cleaner in the hole and blew compressed air through them . screwed them back to their original place ,This cured the problem .  Thanks for the advice  Smiley
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My Current Cars:

1991 Thema station wagon
1989 Thema 16v
2011 Lancia Delta 3

1977 Beta sedan 2000
1975 Fulvia S3 1.3
1973 Flavia HF 2000 Coupe
1972 Fulvia S2 1.3
1989 Thema 8.32
**Other Makes**
2018 Alfa Giulia
1999 Alfa 156
2009 Fiat Du
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