David Harmon wrote:
>
> On 1 Aug 2006 15:29:33 -0700 in rec.autos.makers.jeep+******,
> "bobvonbob" <bennettvonbennett@gmail.com> wrote,
> >thanks -
> >one more question tho - just to clarify: after the nutter the stepper
> >motor is disconnected and no longer functions whatsoever... correct?
> >pins are in the completely forward position... correct?
>
> I have never done it, but in my opinion it only makes sense for the
> pins to be in the middle position, as described in the TSB on
> adjusting the idle mixture screws:
> http://groups.google.com/groups?selm....earthlink.net

You are correct if you want the computer to fine tun the mix, otherwise,
those 2 air needles need to be shut off to get a stable idle.

The stepper and it's pins are an add on to the carb. The pre-82 BBD
carbs didn't have it. They adjust the air mix once the base fuel mix is
set.

To get the best performance out of the BBD, these air tubes need to be
closed so the fuel mix jets can accurately set the mix.

The 'Nutter' covers this by saying to turn the mix screws lean until the
stepper pushes the pins all the way in to full rich or no extra air.

If the stepper isn't working right because you have a dead sensor or O2
sensor, then you can manually pull the pins al the way in. They are
tight because they work on a 'stepper' motor that clicks steps, they
don't pull in smoothly.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

 

David Harmon wrote:
>
> On 1 Aug 2006 15:29:33 -0700 in rec.autos.makers.jeep+******,
> "bobvonbob" <bennettvonbennett@gmail.com> wrote,
> >thanks -
> >one more question tho - just to clarify: after the nutter the stepper
> >motor is disconnected and no longer functions whatsoever... correct?
> >pins are in the completely forward position... correct?
>
> I have never done it, but in my opinion it only makes sense for the
> pins to be in the middle position, as described in the TSB on
> adjusting the idle mixture screws:
> http://groups.google.com/groups?selm....earthlink.net

You are correct if you want the computer to fine tun the mix, otherwise,
those 2 air needles need to be shut off to get a stable idle.

The stepper and it's pins are an add on to the carb. The pre-82 BBD
carbs didn't have it. They adjust the air mix once the base fuel mix is
set.

To get the best performance out of the BBD, these air tubes need to be
closed so the fuel mix jets can accurately set the mix.

The 'Nutter' covers this by saying to turn the mix screws lean until the
stepper pushes the pins all the way in to full rich or no extra air.

If the stepper isn't working right because you have a dead sensor or O2
sensor, then you can manually pull the pins al the way in. They are
tight because they work on a 'stepper' motor that clicks steps, they
don't pull in smoothly.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

 

David Harmon wrote:
>
> On 1 Aug 2006 15:29:33 -0700 in rec.autos.makers.jeep+******,
> "bobvonbob" <bennettvonbennett@gmail.com> wrote,
> >thanks -
> >one more question tho - just to clarify: after the nutter the stepper
> >motor is disconnected and no longer functions whatsoever... correct?
> >pins are in the completely forward position... correct?
>
> I have never done it, but in my opinion it only makes sense for the
> pins to be in the middle position, as described in the TSB on
> adjusting the idle mixture screws:
> http://groups.google.com/groups?selm....earthlink.net

You are correct if you want the computer to fine tun the mix, otherwise,
those 2 air needles need to be shut off to get a stable idle.

The stepper and it's pins are an add on to the carb. The pre-82 BBD
carbs didn't have it. They adjust the air mix once the base fuel mix is
set.

To get the best performance out of the BBD, these air tubes need to be
closed so the fuel mix jets can accurately set the mix.

The 'Nutter' covers this by saying to turn the mix screws lean until the
stepper pushes the pins all the way in to full rich or no extra air.

If the stepper isn't working right because you have a dead sensor or O2
sensor, then you can manually pull the pins al the way in. They are
tight because they work on a 'stepper' motor that clicks steps, they
don't pull in smoothly.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)