jarrid_gross(at)juno.com wrote:
>
> On Thu, 24 Jul 1997 21:52:27 -0700 Sergio Dimarmo <wanderer(at)sure.net>
> writes:
>
> >The carb mixtures are set at idle so it idles fine but when I'm
> >running
> >at highway speeds I feel a slight misfire like the engine is running
> >too
> >lean. If I pull out the choke, the engine runs smoother and has better
> >throttle response. Why would pulling the choke on these carbs make a
> >difference? Does the play in the warm throttle shafts cause the engine
> >to run lean at high RPM? Or would this affect it more at an idle? I
> >would like to fix the carb damper vent on my 150CD carbs as mentioned
>
> Sounds like lean out to me too, which will also make you run hot.
>
> Here is the wierd part though...
>
> Generally, when the shafts are worn, the car will want to run lean
> and idle due to air going around the piston venturi.
> The clever tuner, would tweek the main jet "the only fuel adjustement
> available", to make the richen idle mixture.
> This results in the "at speed mixture" being too rich.
>
> You dont seem to have this problem, so.....
>
> 1) you have an interesting set of needles in your 150CDs.
> 2) perhaps you dont have enough oil in your dampers.
>
> Check the color of all your plugs, and see if you can trace the problem
> to one of the two carbs.
>
> Jarrid
I think I understand. I checked the needles when I re-built the carbs,
they are the 5M size and did not appear to be worn so I re-used them.
Keeping oil in the carbs is a problem, that's why I want to fix them as
described in RSB 68-14. Where can I get those plugs? Is there another
way to plug those holes? I have a color-tune kit that I will try to set
the carbs with.
Thanks,
Sergio
PS..Why would pulling the choke make a ny difference running at hiighway
speeds? The damper is already floating higher than the choke can lift
them right?
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