The oil pressure switch is open with "no" oil pressure and closed "with" oil
pressure. It is not a temp sensor. With the engine running, there is always
power to the choke heater.

There is a temp sensor that operates the manifold heater relay.


In message <43D1A054.2D99F8F5@cac.net>, "philthy" wrote:

>it does tie into the op switch thats how it tells the engine is warm and shuts down choke
>operation ford used this method too
>
>bllsht wrote:
>
>> That switch is only there to keep from powering up the choke heater with the key
>> on and engine off. It's not a safety switch by any means, and won't prevent the
>> engine from running with or without oil pressure.
>>
>> You of all people should know this after your engine rebuild fiasco on Jo's YJ,
>> which uses the same system.
>>
>> In message <43CBABA7.A9E2B105@sympatico.ca>, "Mike Romain" wrote:
>>
>> >What are you talking about?
>> >
>> >It most 'certainly' does have an oil pressure safety switch!
>> >
>> >On my CJ7 that switch is used to control the manifold heater and the
>> >electric choke.
>> >
>> >Mike
>> >
>> >bllsht wrote:
>> >>
>> >> Not from the factory.
>> >>
>> >> In message <43CAAA12.627A33A3@sympatico.ca>, "Mike Romain" wrote:
>> >>
>> >> >There is on my Jeep too...
>> >> >
>> >> >Mike
>> >> >
>> >> >philthy wrote:
>> >> >>
>> >> >> there is on a gm vehicle
>> >> >>
>> >> >> bllsht wrote:
>> >> >>
>> >> >> > In message <43C1245F.466C9200@sympatico.ca>, "Mike Romain" wrote:
>> >> >> >
>> >> >> > >Just a wild guess, but have you connected the oil pressure safety shut
>> >> >> > >off? There is a switch on the oil pressure sender that will cause the
>> >> >> > >engine to shut down after a few seconds of seeing no oil pressure.
>> >> >> >
>> >> >> > There is no such switch.
>> >> >> >
>> >> >> > >
>> >> >> > >Other than that, I am not sure about the need for two computers to run
>> >> >> > >things.
>> >> >> > >
>> >> >> > >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)
>> >> >> > >
>> >> >> > >Lex-Lutor wrote:
>> >> >> > >>
>> >> >> > >> I hope to find some help here about my problem. We made a real monster from
>> >> >> > >> one Laredo (1985 year). After many working hours 5.2L V8 engine from GC
>> >> >> > >> (year 1996) is now fit inside this Jeep. After we start engine it runs 8-10
>> >> >> > >> seconds and than goes Off. (fuel pump, map, temp, and all other engine
>> >> >> > >> sensors are connected OK), since we use only engine CPU I'm pretty much sure
>> >> >> > >> that engine CPU send stop signal to fuel injectors because there is no
>> >> >> > >> signal form board computer, (CPU unit inside Grand Cherokee cabin) Is there
>> >> >> > >> any solution to make fake signal or emulate board computer ???
>> >> >> > >>
>> >> >> > >> We need original CPU since electronic unit from automatic transmission will
>> >> >> > >> not work without engine CPU.
>> >> >> > >>
>> >> >> > >> For final solution we can connect board cpu, but it will be too much wires
>> >> >> > >> and hard to find safety place inside !
>> >> >> > >>
>> >> >> > >> Thanks for any help.
>> >> >> > >>
>> >> >> > >> PS: Just for info, is there any code or other protection inside engine cpu,
>> >> >> > >> is there any problem to exchange engine cpu between same models ??