We talking strombergs or downdraught zenith carbs here?
On either, when the throttle shafts get worn, the mixure runs lean at idle.
On the downdraught, when in decel, the idle jet usually over-richens the
mixture,
but after the manifold vacuum settles out, the mixture becomes lean. This
makes
the idle speed go progressively lower as the mixture leans out.
Also 1.5 to 2 psi is higher than you ought to run on either carb.
If the natural seat leakage which is pressure based, is greater than the
engines idle fuel consumption, the bowls can overflow and cause poor idle
and possible stalling, with a great difficulty in restarting.
Hope one of the two tips helps you out.
Jarrid
> I am have trouble with the idle on my SII. The car has a SV engine with
> > Zenith carbs. I have never rebuilt them. The problem is that when the
> car
> > is warmed up it will not idle correctly. This is what happens: if I
drive
> > up to a stop light I put in the clutch and the car idles at 1500rpm for
a
> > few seconds and then drops to such a low idle that the car usually dies,
> > some times it comes back up to 1500rpm. The car has an electric fuel
pump
> > with a regulator. I tested the system and the pressure is about
1.5-2psi.
> > I plan on rebuilding the carbs soon but I don't what to over look any
> thing
> > that might fix the problem.
> >
> > Thanks,
> >
> > Cole
> >
>
>
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 08:52:47 CDT