High Idle circuit PT's/FC's

[pattypape]

Hi Ralph,


The cruise control on our FC works as you have stated. It is
steady and pretty accurate at highway speeds. All the controlls
operate as designed.

But in the neutral idle mode, it is intermittent, It sometimes
operates properly, other times it will not control the idle speed
and sometimes the high idle will bump the trottle to full open.
Do you have an idea of what could be causing this? Is it possible
that there is a lazy relay or solenoid?? What is the minimum air
pressure required?? Could it be low voltage or a bad ground? I have
pulled the cover off and all the parts look like new and quite
complicated. I decided that I would live with the minor inconvience.

Happy Thanksgiving,

Bill 88 FC

--- In WanderlodgeForum@yahoogroups.com, "Ralph L. Fullenwider"
wrote:
>
> Good morning everyone:
>
> High idle circuit on the PT's;
>
> Power comes from the ignition on cb to the high idle switch on the
dash
> (some PT's have a manual valve rather than an Allen Air electric
valve)
> from the switch on the dash to the low pressure (60 psi) switch to
the
> neutral safety switch. From the neutral safety switch to the Allen
Air
> valve (high idle which is normally closed)
>
> When the Allen Air valve opens, it sends air to the transducer
located on
> the left side of the of the engine on the throttle control unit.
The high
> idle circuit interacts with the throttle control valve, making it
more or
> less inactive because of the amount of air being supplied to the
throttle
> transducer. How that works will be explained when I get the write
up done
> on the throttle control circuit. And I find that system
interesting.
>
> High idle on the FC's;
>
> High idle on the FC's is controlled by using the cruise control in
neutral.
> Turn the power to the on position. then hit the set switch and
each time
> you do that, the RPM's raise a calculated amount. To lower the
amount of
> RPM's you hit the decel side of the set switch and the RPM's will
drop the
> same calculated amount. To cancel the high idle turn off the
cruise control
> power.
>
> Safe travels,
>
> Ralph and Charolette Fullenwider
> Ralph's RV Solutions, Duncan, Oklahoma
> http://home.swbell.net/rlf47/index.htm
>