Idle Fuel Cut Solenoid

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ripsnub - 27 Nov 2006 21:16 GMT

I have seen a few posts regarding stalling issue related to the fuel cut
solenoid...I was wondering if anyone knew what actaully controls this
solenoid to switch open/closed. Whatever actuates this thing went bad, I
know have the solenoid direct wired to the battery through a manual switch
and the stalling problem is no longer, but I never found what actaully
controls the thing.

Thanks.

Steve.

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Mike K - 28 Nov 2006 03:44 GMT

> I have seen a few posts regarding stalling issue related to the fuel cut
> solenoid...I was wondering if anyone knew what actaully controls this
[quoted text clipped - 6 lines]
>
> Steve.

the control of the solenoid depends on the year of the truck.
my 80 20r just has a wire that is hot with the ignition switched on, later
engines also have a vacuum switch in the circuit.
( this info is from a Haynes manual )

Mike

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ripsnub - 28 Nov 2006 18:23 GMT

It is an July 1982 22R 4-speed manual. Original owner, just rolled over 330,
000 miles. I was thinking it might be part of a thermo or vac switch system,
I could not trace were the plug wires went. If it is always hot (as tied into
the ignition) then I guess it doesnt matter, but I assumed it was only
actuated when the engine came to low idle such as when stopping, hence the
stalling issues.

>> I have seen a few posts regarding stalling issue related to the fuel cut
>> solenoid...I was wondering if anyone knew what actaully controls this
[quoted text clipped - 8 lines]
>
>Mike

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Mike K - 29 Nov 2006 01:41 GMT

I looked at the manual again, and I get conflicting info.

the emissions section states all models have a vacuum switch.(location not
described)
the solenoid is to shut off at high vacuum levels to prevent extra fuel from
overheating the catalytic converter.

the wiring diagrams only state "early model" or "typical late model" with no
mention of year
early model is 1 wire hot from ignition
late model is 2 wire from emission control computer

my truck is just a hot wire, but all the emission parts are gone. It is a
tractor, been that way for 10 years ( too much rust to be road legal ) I
just keep welding the frame when it breaks.

> It is an July 1982 22R 4-speed manual. Original owner, just rolled over 330,
> 000 miles. I was thinking it might be part of a thermo or vac switch system,
[quoted text clipped - 15 lines]
> >
> >Mike

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ripsnub - 29 Nov 2006 21:25 GMT

thats funny, I use the bailing wire and duct tape method to keep mine
together...with a nice rattle can paint job every 3 years whether it needs it
or not.
I have not seen any computer control, seems to be one big vacuum-emissions
system with intergrate thermo swichtes, but notice some reference to a
vac/thermo switch in the Haynes manual, but like you said it is unclear with
the use of early model / late model. who knows. it works the way I have it
now with the switch I guess and the mileage is still the same at 18 mpg...I
was just curious on the root cause (orgin) of the problem.
Steve.

>I looked at the manual again, and I get conflicting info.
>
[quoted text clipped - 17 lines]
>> >
>> >Mike

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