V8 5.2 in Laredo but...ECU is not working
01-17-2006, 09:07 AM
#41
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
That is a far cry from 'there is no such switch'. On mine it does not
prevent the carb engine from running, but it prevents burned up parts
and saving a wiring or choke fire from happening would be called a
'safety' switch in my mind.
I was under the impression, maybe mistakenly, that this switch was also
a shut down switch for the FI systems if they don't see oil pressure
after a certain amount of time.
Mike
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 ??
prevent the carb engine from running, but it prevents burned up parts
and saving a wiring or choke fire from happening would be called a
'safety' switch in my mind.
I was under the impression, maybe mistakenly, that this switch was also
a shut down switch for the FI systems if they don't see oil pressure
after a certain amount of time.
Mike
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 ??
01-17-2006, 09:07 AM
#42
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
That is a far cry from 'there is no such switch'. On mine it does not
prevent the carb engine from running, but it prevents burned up parts
and saving a wiring or choke fire from happening would be called a
'safety' switch in my mind.
I was under the impression, maybe mistakenly, that this switch was also
a shut down switch for the FI systems if they don't see oil pressure
after a certain amount of time.
Mike
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 ??
prevent the carb engine from running, but it prevents burned up parts
and saving a wiring or choke fire from happening would be called a
'safety' switch in my mind.
I was under the impression, maybe mistakenly, that this switch was also
a shut down switch for the FI systems if they don't see oil pressure
after a certain amount of time.
Mike
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 ??
01-17-2006, 09:07 AM
#43
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
That is a far cry from 'there is no such switch'. On mine it does not
prevent the carb engine from running, but it prevents burned up parts
and saving a wiring or choke fire from happening would be called a
'safety' switch in my mind.
I was under the impression, maybe mistakenly, that this switch was also
a shut down switch for the FI systems if they don't see oil pressure
after a certain amount of time.
Mike
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 ??
prevent the carb engine from running, but it prevents burned up parts
and saving a wiring or choke fire from happening would be called a
'safety' switch in my mind.
I was under the impression, maybe mistakenly, that this switch was also
a shut down switch for the FI systems if they don't see oil pressure
after a certain amount of time.
Mike
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 ??
01-17-2006, 09:17 AM
#44
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
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.
>
A far cry from 'there is no such switch', eh.
And just FYI, Jo's old 'Nuttered' (no computer) YJ 258 engine that I
helped her rebuild in my driveway in a snow storm a few years back is
still running very strong and just passed another emissions test with
flying colors.
If that switch had of controlled the engine, it would have saved a
couple scary moments when we realized it had no oil pressure. No harm
was done because someone forgot to read the directions on the oil pump,
we caught on fast.
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)
>
> 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.
>
A far cry from 'there is no such switch', eh.
And just FYI, Jo's old 'Nuttered' (no computer) YJ 258 engine that I
helped her rebuild in my driveway in a snow storm a few years back is
still running very strong and just passed another emissions test with
flying colors.
If that switch had of controlled the engine, it would have saved a
couple scary moments when we realized it had no oil pressure. No harm
was done because someone forgot to read the directions on the oil pump,
we caught on fast.
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)
01-17-2006, 09:17 AM
#45
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
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.
>
A far cry from 'there is no such switch', eh.
And just FYI, Jo's old 'Nuttered' (no computer) YJ 258 engine that I
helped her rebuild in my driveway in a snow storm a few years back is
still running very strong and just passed another emissions test with
flying colors.
If that switch had of controlled the engine, it would have saved a
couple scary moments when we realized it had no oil pressure. No harm
was done because someone forgot to read the directions on the oil pump,
we caught on fast.
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)
>
> 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.
>
A far cry from 'there is no such switch', eh.
And just FYI, Jo's old 'Nuttered' (no computer) YJ 258 engine that I
helped her rebuild in my driveway in a snow storm a few years back is
still running very strong and just passed another emissions test with
flying colors.
If that switch had of controlled the engine, it would have saved a
couple scary moments when we realized it had no oil pressure. No harm
was done because someone forgot to read the directions on the oil pump,
we caught on fast.
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)
01-17-2006, 09:17 AM
#46
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
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.
>
A far cry from 'there is no such switch', eh.
And just FYI, Jo's old 'Nuttered' (no computer) YJ 258 engine that I
helped her rebuild in my driveway in a snow storm a few years back is
still running very strong and just passed another emissions test with
flying colors.
If that switch had of controlled the engine, it would have saved a
couple scary moments when we realized it had no oil pressure. No harm
was done because someone forgot to read the directions on the oil pump,
we caught on fast.
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)
>
> 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.
>
A far cry from 'there is no such switch', eh.
And just FYI, Jo's old 'Nuttered' (no computer) YJ 258 engine that I
helped her rebuild in my driveway in a snow storm a few years back is
still running very strong and just passed another emissions test with
flying colors.
If that switch had of controlled the engine, it would have saved a
couple scary moments when we realized it had no oil pressure. No harm
was done because someone forgot to read the directions on the oil pump,
we caught on fast.
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)
01-17-2006, 05:54 PM
#47
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
01-17-2006, 05:54 PM
#48
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
01-17-2006, 05:54 PM
#49
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
01-18-2006, 12:00 AM
#50
Guest
Posts: n/a
Re: V8 5.2 in Laredo but...ECU is not working
In message <43CCFA08.F4D02E28@sympatico.ca>, "Mike Romain" wrote:
>That is a far cry from 'there is no such switch'. On mine it does not
>prevent the carb engine from running, but it prevents burned up parts
>and saving a wiring or choke fire from happening would be called a
>'safety' switch in my mind.
>
>I was under the impression, maybe mistakenly, that this switch was also
>a shut down switch for the FI systems if they don't see oil pressure
>after a certain amount of time.
>
>Mike
>
>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.
Your words once again: "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."
To which I say again. There is no such switch. Get over it.
>> >> >> >
>> >> >> > 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 ??
>That is a far cry from 'there is no such switch'. On mine it does not
>prevent the carb engine from running, but it prevents burned up parts
>and saving a wiring or choke fire from happening would be called a
>'safety' switch in my mind.
>
>I was under the impression, maybe mistakenly, that this switch was also
>a shut down switch for the FI systems if they don't see oil pressure
>after a certain amount of time.
>
>Mike
>
>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.
Your words once again: "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."
To which I say again. There is no such switch. Get over it.
>> >> >> >
>> >> >> > 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 ??