engine swap
09-23-2003, 08:46 AM
#1
Guest
Posts: n/a
engine swap
Hello all,
I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
greenhouse effect more than a medium size enrergy plant. I bought an engine
from a '88 XJ, also MPI, I've drivven the Cherokee so I know the engine is
ok. I swapped the engine and everything went smoothly, except one minor
thing: The engine won't start.
I checked: the ignition, the flywheel, flywheel sensor, the fuel pump and
rail. I need to use the motor management system of the YJ and I noticed that
a few connectors on the throtlebody don't match. I dont know what they are
for. Can anyone tell me where I can find electronical scheduals for those
engines? I think there is a problem with a sensor that doesnt give the right
signal, or no signal at all, because when I let go of the start key, it
seems like the engine wants to start, it bangs a few times and thet stals.
Maybe there are other solutions for my problem, or maybe there are
conversion sets sold somewhere.
--
Greetings from the Netherlands,
Bert
web: http://www.lollyteam.tk/
mail: dutchjeep@hotmail.com
I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
greenhouse effect more than a medium size enrergy plant. I bought an engine
from a '88 XJ, also MPI, I've drivven the Cherokee so I know the engine is
ok. I swapped the engine and everything went smoothly, except one minor
thing: The engine won't start.
I checked: the ignition, the flywheel, flywheel sensor, the fuel pump and
rail. I need to use the motor management system of the YJ and I noticed that
a few connectors on the throtlebody don't match. I dont know what they are
for. Can anyone tell me where I can find electronical scheduals for those
engines? I think there is a problem with a sensor that doesnt give the right
signal, or no signal at all, because when I let go of the start key, it
seems like the engine wants to start, it bangs a few times and thet stals.
Maybe there are other solutions for my problem, or maybe there are
conversion sets sold somewhere.
--
Greetings from the Netherlands,
Bert
web: http://www.lollyteam.tk/
mail: dutchjeep@hotmail.com
09-23-2003, 09:31 AM
#2
Guest
Posts: n/a
Re: engine swap
The 88 has a ballast resistor to supply power to the fuel pump when the
key is in run. When the key is in start, this resistor is bypassed.
It sits out on the drivers side fender near the rad on the 88 XJ.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Bert wrote:
>
> Hello all,
> I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> greenhouse effect more than a medium size enrergy plant. I bought an engine
> from a '88 XJ, also MPI, I've drivven the Cherokee so I know the engine is
> ok. I swapped the engine and everything went smoothly, except one minor
> thing: The engine won't start.
> I checked: the ignition, the flywheel, flywheel sensor, the fuel pump and
> rail. I need to use the motor management system of the YJ and I noticed that
> a few connectors on the throtlebody don't match. I dont know what they are
> for. Can anyone tell me where I can find electronical scheduals for those
> engines? I think there is a problem with a sensor that doesnt give the right
> signal, or no signal at all, because when I let go of the start key, it
> seems like the engine wants to start, it bangs a few times and thet stals.
> Maybe there are other solutions for my problem, or maybe there are
> conversion sets sold somewhere.
>
> --
> Greetings from the Netherlands,
>
> Bert
>
> web: http://www.lollyteam.tk/
> mail: dutchjeep@hotmail.com
key is in run. When the key is in start, this resistor is bypassed.
It sits out on the drivers side fender near the rad on the 88 XJ.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Bert wrote:
>
> Hello all,
> I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> greenhouse effect more than a medium size enrergy plant. I bought an engine
> from a '88 XJ, also MPI, I've drivven the Cherokee so I know the engine is
> ok. I swapped the engine and everything went smoothly, except one minor
> thing: The engine won't start.
> I checked: the ignition, the flywheel, flywheel sensor, the fuel pump and
> rail. I need to use the motor management system of the YJ and I noticed that
> a few connectors on the throtlebody don't match. I dont know what they are
> for. Can anyone tell me where I can find electronical scheduals for those
> engines? I think there is a problem with a sensor that doesnt give the right
> signal, or no signal at all, because when I let go of the start key, it
> seems like the engine wants to start, it bangs a few times and thet stals.
> Maybe there are other solutions for my problem, or maybe there are
> conversion sets sold somewhere.
>
> --
> Greetings from the Netherlands,
>
> Bert
>
> web: http://www.lollyteam.tk/
> mail: dutchjeep@hotmail.com
09-23-2003, 09:31 AM
#3
Guest
Posts: n/a
Re: engine swap
The 88 has a ballast resistor to supply power to the fuel pump when the
key is in run. When the key is in start, this resistor is bypassed.
It sits out on the drivers side fender near the rad on the 88 XJ.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Bert wrote:
>
> Hello all,
> I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> greenhouse effect more than a medium size enrergy plant. I bought an engine
> from a '88 XJ, also MPI, I've drivven the Cherokee so I know the engine is
> ok. I swapped the engine and everything went smoothly, except one minor
> thing: The engine won't start.
> I checked: the ignition, the flywheel, flywheel sensor, the fuel pump and
> rail. I need to use the motor management system of the YJ and I noticed that
> a few connectors on the throtlebody don't match. I dont know what they are
> for. Can anyone tell me where I can find electronical scheduals for those
> engines? I think there is a problem with a sensor that doesnt give the right
> signal, or no signal at all, because when I let go of the start key, it
> seems like the engine wants to start, it bangs a few times and thet stals.
> Maybe there are other solutions for my problem, or maybe there are
> conversion sets sold somewhere.
>
> --
> Greetings from the Netherlands,
>
> Bert
>
> web: http://www.lollyteam.tk/
> mail: dutchjeep@hotmail.com
key is in run. When the key is in start, this resistor is bypassed.
It sits out on the drivers side fender near the rad on the 88 XJ.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Bert wrote:
>
> Hello all,
> I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> greenhouse effect more than a medium size enrergy plant. I bought an engine
> from a '88 XJ, also MPI, I've drivven the Cherokee so I know the engine is
> ok. I swapped the engine and everything went smoothly, except one minor
> thing: The engine won't start.
> I checked: the ignition, the flywheel, flywheel sensor, the fuel pump and
> rail. I need to use the motor management system of the YJ and I noticed that
> a few connectors on the throtlebody don't match. I dont know what they are
> for. Can anyone tell me where I can find electronical scheduals for those
> engines? I think there is a problem with a sensor that doesnt give the right
> signal, or no signal at all, because when I let go of the start key, it
> seems like the engine wants to start, it bangs a few times and thet stals.
> Maybe there are other solutions for my problem, or maybe there are
> conversion sets sold somewhere.
>
> --
> Greetings from the Netherlands,
>
> Bert
>
> web: http://www.lollyteam.tk/
> mail: dutchjeep@hotmail.com
09-23-2003, 09:38 AM
#4
Guest
Posts: n/a
Re: engine swap
"Bert" <tandartsbus@hotmail.com> wrote in message
news:3f704089$0$58698$e4fe514c@news.xs4all.nl...
> Hello all,
> I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> greenhouse effect more than a medium size enrergy plant.
Unless its unning rich, burning oil and burning everything else I doubt this
very much, if this was the sole reason for swapping to a much earlier
engine...well, lets say the tree huggers still won't like you. ;)
> I bought an engine from a '88 XJ, also MPI,
An 88 with MPI?? Thought they only had TBI in 88?
> I swapped the engine and everything went smoothly, except one minor
> thing: The engine won't start.
Did you swap out the 2 computers? they may be different, since the 91 engine
was an HO.
09-23-2003, 09:38 AM
#5
Guest
Posts: n/a
Re: engine swap
"Bert" <tandartsbus@hotmail.com> wrote in message
news:3f704089$0$58698$e4fe514c@news.xs4all.nl...
> Hello all,
> I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> greenhouse effect more than a medium size enrergy plant.
Unless its unning rich, burning oil and burning everything else I doubt this
very much, if this was the sole reason for swapping to a much earlier
engine...well, lets say the tree huggers still won't like you. ;)
> I bought an engine from a '88 XJ, also MPI,
An 88 with MPI?? Thought they only had TBI in 88?
> I swapped the engine and everything went smoothly, except one minor
> thing: The engine won't start.
Did you swap out the 2 computers? they may be different, since the 91 engine
was an HO.
09-23-2003, 09:47 AM
#6
Guest
Posts: n/a
Re: engine swap
Snow wrote:
>
> "Bert" <tandartsbus@hotmail.com> wrote in message
> news:3f704089$0$58698$e4fe514c@news.xs4all.nl...
> > Hello all,
> > I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> > greenhouse effect more than a medium size enrergy plant.
>
> Unless its unning rich, burning oil and burning everything else I doubt this
> very much, if this was the sole reason for swapping to a much earlier
> engine...well, lets say the tree huggers still won't like you. ;)
>
> > I bought an engine from a '88 XJ, also MPI,
>
> An 88 with MPI?? Thought they only had TBI in 88?
>
> > I swapped the engine and everything went smoothly, except one minor
> > thing: The engine won't start.
>
> Did you swap out the 2 computers? they may be different, since the 91 engine
> was an HO.
They are different computers for sure.
The 88 runs on the old style, the 91 is the Chrysler version.
The 88 is also a MPI engine.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
>
> "Bert" <tandartsbus@hotmail.com> wrote in message
> news:3f704089$0$58698$e4fe514c@news.xs4all.nl...
> > Hello all,
> > I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> > greenhouse effect more than a medium size enrergy plant.
>
> Unless its unning rich, burning oil and burning everything else I doubt this
> very much, if this was the sole reason for swapping to a much earlier
> engine...well, lets say the tree huggers still won't like you. ;)
>
> > I bought an engine from a '88 XJ, also MPI,
>
> An 88 with MPI?? Thought they only had TBI in 88?
>
> > I swapped the engine and everything went smoothly, except one minor
> > thing: The engine won't start.
>
> Did you swap out the 2 computers? they may be different, since the 91 engine
> was an HO.
They are different computers for sure.
The 88 runs on the old style, the 91 is the Chrysler version.
The 88 is also a MPI engine.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
09-23-2003, 09:47 AM
#7
Guest
Posts: n/a
Re: engine swap
Snow wrote:
>
> "Bert" <tandartsbus@hotmail.com> wrote in message
> news:3f704089$0$58698$e4fe514c@news.xs4all.nl...
> > Hello all,
> > I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> > greenhouse effect more than a medium size enrergy plant.
>
> Unless its unning rich, burning oil and burning everything else I doubt this
> very much, if this was the sole reason for swapping to a much earlier
> engine...well, lets say the tree huggers still won't like you. ;)
>
> > I bought an engine from a '88 XJ, also MPI,
>
> An 88 with MPI?? Thought they only had TBI in 88?
>
> > I swapped the engine and everything went smoothly, except one minor
> > thing: The engine won't start.
>
> Did you swap out the 2 computers? they may be different, since the 91 engine
> was an HO.
They are different computers for sure.
The 88 runs on the old style, the 91 is the Chrysler version.
The 88 is also a MPI engine.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
>
> "Bert" <tandartsbus@hotmail.com> wrote in message
> news:3f704089$0$58698$e4fe514c@news.xs4all.nl...
> > Hello all,
> > I own a '91 YJ with a 4.0 litres HO engine, wich contributes to the
> > greenhouse effect more than a medium size enrergy plant.
>
> Unless its unning rich, burning oil and burning everything else I doubt this
> very much, if this was the sole reason for swapping to a much earlier
> engine...well, lets say the tree huggers still won't like you. ;)
>
> > I bought an engine from a '88 XJ, also MPI,
>
> An 88 with MPI?? Thought they only had TBI in 88?
>
> > I swapped the engine and everything went smoothly, except one minor
> > thing: The engine won't start.
>
> Did you swap out the 2 computers? they may be different, since the 91 engine
> was an HO.
They are different computers for sure.
The 88 runs on the old style, the 91 is the Chrysler version.
The 88 is also a MPI engine.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
09-23-2003, 09:56 AM
#8
Guest
Posts: n/a
Re: engine swap
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F704EFB.F22B0B7D@sympatico.ca...
> The 88 is also a MPI engine.
Wow..did not know that... learn something new everyday :), mind you most
88's I'm use to were either still carb'ed or TBI (CFI if its a ford).
Snow...
09-23-2003, 09:56 AM
#9
Guest
Posts: n/a
Re: engine swap
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F704EFB.F22B0B7D@sympatico.ca...
> The 88 is also a MPI engine.
Wow..did not know that... learn something new everyday :), mind you most
88's I'm use to were either still carb'ed or TBI (CFI if its a ford).
Snow...
09-23-2003, 10:51 AM
#10
Guest
Posts: n/a
Re: engine swap
Snow wrote:
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F704EFB.F22B0B7D@sympatico.ca...
> > The 88 is also a MPI engine.
>
> Wow..did not know that... learn something new everyday :), mind you most
> 88's I'm use to were either still carb'ed or TBI (CFI if its a ford).
>
> Snow...
They just called it a 4.0 in the Cherokee. The TBI was only on the 4
bangers I think. They went to the 4.0 HO engine in 92 in the Cherokee I
think and all the YJ 4.0's were the HO.
The big difference is the computer management system. They are not
cross compatible computers.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3F704EFB.F22B0B7D@sympatico.ca...
> > The 88 is also a MPI engine.
>
> Wow..did not know that... learn something new everyday :), mind you most
> 88's I'm use to were either still carb'ed or TBI (CFI if its a ford).
>
> Snow...
They just called it a 4.0 in the Cherokee. The TBI was only on the 4
bangers I think. They went to the 4.0 HO engine in 92 in the Cherokee I
think and all the YJ 4.0's were the HO.
The big difference is the computer management system. They are not
cross compatible computers.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's