Re: rough idle

[Jim Altemose <jaltemoose@xxxxxxxxx>]

What to do, what to do?  I have a 63 Polara 500 with a 383 and BBD
3475s carb.  It just developed a rough idle, after warming up.  I
hooked a tach up and it's idling around 300 RPM.  I realize it should
500 RPM, but I found the idle adjust screw is already all the way in;
the previous owner must have done it.

I'm waffling between:
a) extract the venturi mechanism and clean the idle tubes
b) rebuild the carb
c) replace manifold and carb with a more powerful 4 barrel

I'd been planning on replacing the manifold and carb with something
beefier than the 2 barrel, but not for a while.  If I did this, I'd
want to keep it period correct; it's a very original car.  Any
recommendations on where to get a correct manifold and carb?  I guess
I'd want a Carter AFB?  Any thoughts on how much performance I might
pick up over the BBD 2 barrel?  How much advantage might a new Eddy or
Holley have over an old Carter?  I've already replaced the 5/16 fuel
line with 3/8.

I'm thinking I'll try cleaning the idle tubes first and see if that
quick fixes it.

As always, thanks.

- Jim

On Wed, Sep 3, 2008 at 2:51 PM, Jim Altemose <jaltemoose@xxxxxxxxx> wrote:
> I have a 63 Polara 500 with a 383 and BBD 3475s carb.  It just started
> idling rough when I stop.  It's steady, but rough; shakes the car back
> and forth a bit.  I was planning on following the service manual which
> says adjust idle screw to 500 RPM, then adjust two idle mixture screws
> till it goes lean, then adjust back and re-adjust idle screw to 500
> RPM.
>
> But I was reading some things on line about the the Carter BBD carbs
> being very common to have the idle filler tubes in the venturi clog.
> Anyone have experience with this?  Is removing and cleaning the filler
> tubes the first thing to try?  Any tricks to this?
>
> As always, thanks.
>
> - Jim
> Jim Altemose, Long Island, NY
> '63 Polara 500 (Max Wedge)
> '63 Polara 500 (383)
> '65 Belvedere I (Street Wedge)
> '71 Bronco
>


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