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#Post#: 101931--------------------------------------------------
Refuses to idle nicely
By: pintofale Date: November 18, 2016, 3:39 am
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I'm still having carb/idling trouble - I got distracted by a
dodgy alternator (which could have been the problem but wasn't),
dodgy ignition (powerspark kit fitted, working nicely) and other
general woes.
I am convinced everything is tuned nicely, it runs really well
and is fairly economical (for a 57 year old petrol Land Rover).
But it will not idle - the revs drop and it stalls.
If I pull out the choke a couple of inches, it idles beautifully
- slow and smooth. I can drive it like this but it's too rich,
there is smoke and the power is well down, and the economy sinks
noticably.
I presume it's fuel starved at low revs, but I don't understand
how - I did think the idling jet might be blocked but that
wouldn't be fixed by the choke richening it up.
Anyone got any bright ideas? It's a standard zenith carb.
#Post#: 101932--------------------------------------------------
Re: Refuses to idle nicely
By: NoelC Date: November 18, 2016, 8:44 am
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When this happened to the ambulance (Solex carb, overhauled a
few months earlier by the Carburettor Exchange) it was a simple
fix, the screws that held the body of the carb together had
worked loose - enough to obviously allow air past a gasket
somewhere. I tightened them all up and the problem was solved.
Sounds to me that could be your cause, air being sucked in
somewhere weakening the mixture at idle.
#Post#: 101934--------------------------------------------------
Re: Refuses to idle nicely
By: pintofale Date: November 18, 2016, 9:35 am
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Thanks Noel, I think it's all tight but I will double check, it
sounds like a good call.
#Post#: 101935--------------------------------------------------
Re: Refuses to idle nicely
By: Parn Date: November 18, 2016, 3:50 pm
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Noel is right there is air being sucked in somewhere and giving
a very lean mixture on idle (hence the stalling).
When you "crack" the main butterfly there is sufficient fuel to
override the problem.
You could check for wear in the main butterfly shaft and/or the
throttle body it runs in.
Hope this helps
Cheers
Alan
#Post#: 101936--------------------------------------------------
Re: Refuses to idle nicely
By: divie Date: November 19, 2016, 3:21 pm
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Does sound like an air leak. In the past I have bored the
throttle spindle position and fitted a bush to restore things.
The spindle is usually OK just the ally body that wears.
#Post#: 101937--------------------------------------------------
Re: Refuses to idle nicely
By: D4B Date: November 20, 2016, 5:25 am
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I had EXACTLY the same problem with my Series 3 2.25 petrol
Landy with a Zenith 36IV carb.
So I followed the rebuild instructions here
HTML http://c0007716.cdn2.cloudfiles.rackspacecloud.com/instructions/RNC959I.pdf
particularly sanding / lapping the two carb halves, and it works
beautifully now....
Good Luck, Steve
#Post#: 101938--------------------------------------------------
Re: Refuses to idle nicely
By: pintofale Date: November 21, 2016, 2:58 am
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Thanks everyone, I had a quick check for leaks and couldn't see
anything obvious, and top half was clamped on tightly, but I
will try the strip down and resurfacing idea. I know it did
have an overheating problem for a while so that probably makes
sense.
#Post#: 101983--------------------------------------------------
Re: Refuses to idle nicely
By: w3526602 Date: December 13, 2016, 3:08 pm
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Hi,
Pull the idle Jet from side of the carb. Pull jet from it's
hexagon carrier, poke though with a strand of copper electric
cable, put every thing back.
Remove the volume control screw from bottom of the carb ...
that's the other screw with a spring round it - not the
tick-over screw. Twice I have found a non-removable jet jambed
on the pointed end ... ham fisted PO.
602
#Post#: 101992--------------------------------------------------
Re: Refuses to idle nicely
By: pintofale Date: December 19, 2016, 6:01 am
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I think it might be an inlet manifold leak, I was not totally
happy with the mainfold-to-manifold seal when stuck it all back
together in the summer, so I will look there first.
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