Been stood for 2 weeks without starting. Starts Ok with full choke (both of 'em???) But it wont idle? Let off the accelerator & it just splutters out even if I have run if for 5 minutes at fast tickover (with my foot) Last time I used it all was well. It runs well enough & smooth, but the tickover aint having any of it.
I'm a bit rusty on s3 stuff it was 8 years ago:O) got a diesel 90 now. I think crap came in down the air intake pipe ,went into the float bowl and blocked the jet.
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number 26, and blow it out with compressed air . that's what it was when mine did that, but mine was a 73. I haven't seen the other type of carb as mine had a Webber already
Pretty much standard behavior for mine in winter, I have to juggle with the throttle every time I come to a stop. I just put up with it at the moment, interested to see if this is remediable.
It's probably running on a Weber carb. For starters, one of the chokes will not be connected to anything (probably the one on the steering column). They were an aftermarket conversion, and the choke cable went in at the other side to the original zenith carbs, and hence wasn't long enough. There's also a chance that one is linked up as a hand throttle. Have a look at where they go on the carb and work it out.
Webers are quite prone to icing up in cold/damp weather generally causing crap idling. When you next get the symptoms have a look at the top of the carb / put your fingers on to see if its freezing cold. Being light with your foot helps avoid icing while the engine warms up.
When you've properly warmed it up then you can asses further what the problem is. If when slowly releasing the accelerator you find the engine gradually slows down until ticking over too slow and dying then its the idle adjustment - wind the idle scew in a bit. If its got a dead spot below mid throttle openings then its probably got a blocked idle jet - quick job to strip down and clean out the carb.
Having the same trouble with my S3 2.25 as well. Having been up all night learning how carbs work I am convinced my Zenith 36IV has a blocked idle jet. Or a leaky fuel line that's letting in air. Or something else altogether. Anyway, I am going to try overhauling the carb this weekend, I'll let you know how it goes...
A leaky fuel line will not "let in air" in a manner that will affect idle. A loose or damaged inlet manifold or manifold gasket however will cause an air leak that could give these symptoms.
The quickest way the test this is to get a vacuum guage and check what the manifold vacuum is a idle.
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