out of ideas - Page 2

stevo48 · Feb 17th, 2011, 11:46

If adjusting the carb makes little or no difference you have an air leak somewhere, Adjusting the mixture screw on the carb alters the fuel/air mix, if you have too much air getting into the carb it will not adjust correctly and cause the uneven idle.
Whilst the engine is running try spraying WD40 around the carb/carb mountings and associated components, listen for any change in the engine tickover and watch for bubbles or fluid being sucked in.

Hair bear · Feb 17th, 2011, 20:01

All the accosiated plumbing around the carb correct?
One of the pipes has a restrictor in it, is it blocked / missing?

foggyjames · Feb 21st, 2011, 19:26

Another vote for an air leak. Stevo's advice looks spot on as a starting point.

cheers

James

60041 · Feb 21st, 2011, 19:39

Blocked idle jet?
I used to have a Renault 5 with the same engine as the 340. I had exactly the same problem, and like you tried all the hoses, checked for air leaks etc. One day I had stripped the carb (again) and noticed that the hole in the idle jet did not look round when I held it up to the light, so I poked it out with a stiff bristle from a brush (don't use wire) put everything back together and it was cured.

spike4073 · Apr 5th, 2011, 13:32

well after replacing the carb which fixed the problem i did a little research and i replaced the solenoid on the old carb and re-fitted it and it runs fine now

wish i knew that was all it needed before i went and bought another carb lol

ah well so long as its running good .. thats the important thing.

so i find myself with a spare carb if anyone wants one... make me an offer

cheers

mchudd · Apr 7th, 2011, 14:01

Hi mate.
You might be better to keep it as a spare.
They are getting hard to find.
Cheers Mark.

Feb 17th, 2011, 11:46	#11
stevo48 Premier Member Last Online: Jul 9th, 2020 20:08 Join Date: Dec 2007 Location: Halifax West yorkshire	If adjusting the carb makes little or no difference you have an air leak somewhere, Adjusting the mixture screw on the carb alters the fuel/air mix, if you have too much air getting into the carb it will not adjust correctly and cause the uneven idle. Whilst the engine is running try spraying WD40 around the carb/carb mountings and associated components, listen for any change in the engine tickover and watch for bubbles or fluid being sucked in. Last edited by stevo48; Feb 17th, 2011 at 11:49.

Feb 21st, 2011, 19:26	#13
foggyjames 300 Register Keeper Last Online: Jun 20th, 2024 00:00 Join Date: Dec 2001 Location: Nottingham	Another vote for an air leak. Stevo's advice looks spot on as a starting point. cheers James __________________ VOC 300-series Register Keeper '13 V70 D4 SE Lux '89 740 Turbo Intercooler '88 360 Turbo Intercooler '84 360 GLT '81 343 GLS R-Sport '79 343 DL '70 164

Feb 21st, 2011, 19:39	#14
60041 Premier Member Last Online: May 23rd, 2024 21:01 Join Date: Feb 2010 Location: North Northumberland	Blocked idle jet? I used to have a Renault 5 with the same engine as the 340. I had exactly the same problem, and like you tried all the hoses, checked for air leaks etc. One day I had stripped the carb (again) and noticed that the hole in the idle jet did not look round when I held it up to the light, so I poked it out with a stiff bristle from a brush (don't use wire) put everything back together and it was cured. __________________ 2018 V90CC D4, 2022 XC40 1940 Matchless G3, 1980 Moto Guzzi T3 Coming soon:- 1947Rover 14 P2

Apr 7th, 2011, 14:01	#16
mchudd Senior Member Last Online: Jul 22nd, 2021 14:56 Join Date: Apr 2006 Location: BELFAST	340 Hi mate. You might be better to keep it as a spare. They are getting hard to find. Cheers Mark.

Feb 17th, 2011, 20:01	#12
Hair bear Junior Member Last Online: Apr 7th, 2024 11:21 Join Date: Feb 2011 Location: Hampshire	All the accosiated plumbing around the carb correct? One of the pipes has a restrictor in it, is it blocked / missing?

Apr 5th, 2011, 13:32	#15
spike4073 Member Last Online: Nov 26th, 2011 11:12 Join Date: Aug 2008 Location: sheffield	well after replacing the carb which fixed the problem i did a little research and i replaced the solenoid on the old carb and re-fitted it and it runs fine now wish i knew that was all it needed before i went and bought another carb lol ah well so long as its running good .. thats the important thing. so i find myself with a spare carb if anyone wants one... make me an offer cheers

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