4.0 vs 4.0HO?
 

hey everyone! got a question for all you jeep gurus out there... i'm
sure that someone can answer my question for me. ok, i have an 88
cherokee with the 4.0 in it. now i remember a while back when i was
just searching around reading articles someone said that the only
difference between the regular 4.0 and the high output was the
computer? the old was made by bendix if i remember right? anyways, in
the same post i read that when they switched over to the high output
they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
went to my local jeep dealership's parts dept to talk to them, and
they said that they haven't heard of it and if it does exist then it
was probably made by an aftermarket manufacturer. however, he didn't
seem like the smartest guy in the world and he didn't even bother to
look for it so there might be a mopar upgrade. my question is have any
of you ever heard of this kit? if it is a mopar part do you know the
product number? if it's aftermarket who makes it? i really want to do
this. have any of you ever done this before or heard of it being done?
money isn't too much of a worry so im not too concerned with the cost.
a friend suggested that i go to a junkyard and pull the computer and
all the associated wiring of a newer cherokee, but i don't know if
it's just that simple. any input would be greatly appreciated. thanks
in advance!

james morrow

Re: 4.0 vs 4.0HO?
 

Let me get this right.... You are taking a simple fuel injection system
that worked great for years and are wanting to replace it with a bunch
of over complicated, 'really' expensive to fix Chrysler crap??

Just things like the emissions light or maint req light. On yours, you
can unplug a module, on the fancy one you 'have' to spend at least
$75.00 to have Chrysler turn it off, etc....

Then we can talk gas mileage. The 'fancy' system gets about 5 mpg or
more less.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

James Morrow wrote:
>
> hey everyone! got a question for all you jeep gurus out there... i'm
> sure that someone can answer my question for me. ok, i have an 88
> cherokee with the 4.0 in it. now i remember a while back when i was
> just searching around reading articles someone said that the only
> difference between the regular 4.0 and the high output was the
> computer? the old was made by bendix if i remember right? anyways, in
> the same post i read that when they switched over to the high output
> they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
> went to my local jeep dealership's parts dept to talk to them, and
> they said that they haven't heard of it and if it does exist then it
> was probably made by an aftermarket manufacturer. however, he didn't
> seem like the smartest guy in the world and he didn't even bother to
> look for it so there might be a mopar upgrade. my question is have any
> of you ever heard of this kit? if it is a mopar part do you know the
> product number? if it's aftermarket who makes it? i really want to do
> this. have any of you ever done this before or heard of it being done?
> money isn't too much of a worry so im not too concerned with the cost.
> a friend suggested that i go to a junkyard and pull the computer and
> all the associated wiring of a newer cherokee, but i don't know if
> it's just that simple. any input would be greatly appreciated. thanks
> in advance!
>
> james morrow

Re: 4.0 vs 4.0HO?
 

Let me get this right.... You are taking a simple fuel injection system
that worked great for years and are wanting to replace it with a bunch
of over complicated, 'really' expensive to fix Chrysler crap??

Just things like the emissions light or maint req light. On yours, you
can unplug a module, on the fancy one you 'have' to spend at least
$75.00 to have Chrysler turn it off, etc....

Then we can talk gas mileage. The 'fancy' system gets about 5 mpg or
more less.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

James Morrow wrote:
>
> hey everyone! got a question for all you jeep gurus out there... i'm
> sure that someone can answer my question for me. ok, i have an 88
> cherokee with the 4.0 in it. now i remember a while back when i was
> just searching around reading articles someone said that the only
> difference between the regular 4.0 and the high output was the
> computer? the old was made by bendix if i remember right? anyways, in
> the same post i read that when they switched over to the high output
> they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
> went to my local jeep dealership's parts dept to talk to them, and
> they said that they haven't heard of it and if it does exist then it
> was probably made by an aftermarket manufacturer. however, he didn't
> seem like the smartest guy in the world and he didn't even bother to
> look for it so there might be a mopar upgrade. my question is have any
> of you ever heard of this kit? if it is a mopar part do you know the
> product number? if it's aftermarket who makes it? i really want to do
> this. have any of you ever done this before or heard of it being done?
> money isn't too much of a worry so im not too concerned with the cost.
> a friend suggested that i go to a junkyard and pull the computer and
> all the associated wiring of a newer cherokee, but i don't know if
> it's just that simple. any input would be greatly appreciated. thanks
> in advance!
>
> james morrow

Re: 4.0 vs 4.0HO?
 

Let me get this right.... You are taking a simple fuel injection system
that worked great for years and are wanting to replace it with a bunch
of over complicated, 'really' expensive to fix Chrysler crap??

Just things like the emissions light or maint req light. On yours, you
can unplug a module, on the fancy one you 'have' to spend at least
$75.00 to have Chrysler turn it off, etc....

Then we can talk gas mileage. The 'fancy' system gets about 5 mpg or
more less.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

James Morrow wrote:
>
> hey everyone! got a question for all you jeep gurus out there... i'm
> sure that someone can answer my question for me. ok, i have an 88
> cherokee with the 4.0 in it. now i remember a while back when i was
> just searching around reading articles someone said that the only
> difference between the regular 4.0 and the high output was the
> computer? the old was made by bendix if i remember right? anyways, in
> the same post i read that when they switched over to the high output
> they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
> went to my local jeep dealership's parts dept to talk to them, and
> they said that they haven't heard of it and if it does exist then it
> was probably made by an aftermarket manufacturer. however, he didn't
> seem like the smartest guy in the world and he didn't even bother to
> look for it so there might be a mopar upgrade. my question is have any
> of you ever heard of this kit? if it is a mopar part do you know the
> product number? if it's aftermarket who makes it? i really want to do
> this. have any of you ever done this before or heard of it being done?
> money isn't too much of a worry so im not too concerned with the cost.
> a friend suggested that i go to a junkyard and pull the computer and
> all the associated wiring of a newer cherokee, but i don't know if
> it's just that simple. any input would be greatly appreciated. thanks
> in advance!
>
> james morrow

Re: 4.0 vs 4.0HO?
 

Let me get this right.... You are taking a simple fuel injection system
that worked great for years and are wanting to replace it with a bunch
of over complicated, 'really' expensive to fix Chrysler crap??

Just things like the emissions light or maint req light. On yours, you
can unplug a module, on the fancy one you 'have' to spend at least
$75.00 to have Chrysler turn it off, etc....

Then we can talk gas mileage. The 'fancy' system gets about 5 mpg or
more less.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

James Morrow wrote:
>
> hey everyone! got a question for all you jeep gurus out there... i'm
> sure that someone can answer my question for me. ok, i have an 88
> cherokee with the 4.0 in it. now i remember a while back when i was
> just searching around reading articles someone said that the only
> difference between the regular 4.0 and the high output was the
> computer? the old was made by bendix if i remember right? anyways, in
> the same post i read that when they switched over to the high output
> they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
> went to my local jeep dealership's parts dept to talk to them, and
> they said that they haven't heard of it and if it does exist then it
> was probably made by an aftermarket manufacturer. however, he didn't
> seem like the smartest guy in the world and he didn't even bother to
> look for it so there might be a mopar upgrade. my question is have any
> of you ever heard of this kit? if it is a mopar part do you know the
> product number? if it's aftermarket who makes it? i really want to do
> this. have any of you ever done this before or heard of it being done?
> money isn't too much of a worry so im not too concerned with the cost.
> a friend suggested that i go to a junkyard and pull the computer and
> all the associated wiring of a newer cherokee, but i don't know if
> it's just that simple. any input would be greatly appreciated. thanks
> in advance!
>
> james morrow

Re: 4.0 vs 4.0HO?
 

it's not that simple. the HO model has the intake ports set higher up on
the head. it's not just a computer swap. to do it right, you would have to
get the head, intake and computer plus wiring off a junkyard jeep. you may
have to get all the sensors too, like the cps, etc. google "4.0 head" or
something like that.

"James Morrow" <tahoejeebs@aol.com> wrote in message
news:c7c3e39b.0405312257.14003cd0@posting.google.c om...
> hey everyone! got a question for all you jeep gurus out there... i'm
> sure that someone can answer my question for me. ok, i have an 88
> cherokee with the 4.0 in it. now i remember a while back when i was
> just searching around reading articles someone said that the only
> difference between the regular 4.0 and the high output was the
> computer? the old was made by bendix if i remember right? anyways, in
> the same post i read that when they switched over to the high output
> they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
> went to my local jeep dealership's parts dept to talk to them, and
> they said that they haven't heard of it and if it does exist then it
> was probably made by an aftermarket manufacturer. however, he didn't
> seem like the smartest guy in the world and he didn't even bother to
> look for it so there might be a mopar upgrade. my question is have any
> of you ever heard of this kit? if it is a mopar part do you know the
> product number? if it's aftermarket who makes it? i really want to do
> this. have any of you ever done this before or heard of it being done?
> money isn't too much of a worry so im not too concerned with the cost.
> a friend suggested that i go to a junkyard and pull the computer and
> all the associated wiring of a newer cherokee, but i don't know if
> it's just that simple. any input would be greatly appreciated. thanks
> in advance!
>
> james morrow

Re: 4.0 vs 4.0HO?
 

it's not that simple. the HO model has the intake ports set higher up on
the head. it's not just a computer swap. to do it right, you would have to
get the head, intake and computer plus wiring off a junkyard jeep. you may
have to get all the sensors too, like the cps, etc. google "4.0 head" or
something like that.

"James Morrow" <tahoejeebs@aol.com> wrote in message
news:c7c3e39b.0405312257.14003cd0@posting.google.c om...
> hey everyone! got a question for all you jeep gurus out there... i'm
> sure that someone can answer my question for me. ok, i have an 88
> cherokee with the 4.0 in it. now i remember a while back when i was
> just searching around reading articles someone said that the only
> difference between the regular 4.0 and the high output was the
> computer? the old was made by bendix if i remember right? anyways, in
> the same post i read that when they switched over to the high output
> they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
> went to my local jeep dealership's parts dept to talk to them, and
> they said that they haven't heard of it and if it does exist then it
> was probably made by an aftermarket manufacturer. however, he didn't
> seem like the smartest guy in the world and he didn't even bother to
> look for it so there might be a mopar upgrade. my question is have any
> of you ever heard of this kit? if it is a mopar part do you know the
> product number? if it's aftermarket who makes it? i really want to do
> this. have any of you ever done this before or heard of it being done?
> money isn't too much of a worry so im not too concerned with the cost.
> a friend suggested that i go to a junkyard and pull the computer and
> all the associated wiring of a newer cherokee, but i don't know if
> it's just that simple. any input would be greatly appreciated. thanks
> in advance!
>
> james morrow

Re: 4.0 vs 4.0HO?
 

it's not that simple. the HO model has the intake ports set higher up on
the head. it's not just a computer swap. to do it right, you would have to
get the head, intake and computer plus wiring off a junkyard jeep. you may
have to get all the sensors too, like the cps, etc. google "4.0 head" or
something like that.

"James Morrow" <tahoejeebs@aol.com> wrote in message
news:c7c3e39b.0405312257.14003cd0@posting.google.c om...
> hey everyone! got a question for all you jeep gurus out there... i'm
> sure that someone can answer my question for me. ok, i have an 88
> cherokee with the 4.0 in it. now i remember a while back when i was
> just searching around reading articles someone said that the only
> difference between the regular 4.0 and the high output was the
> computer? the old was made by bendix if i remember right? anyways, in
> the same post i read that when they switched over to the high output
> they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
> went to my local jeep dealership's parts dept to talk to them, and
> they said that they haven't heard of it and if it does exist then it
> was probably made by an aftermarket manufacturer. however, he didn't
> seem like the smartest guy in the world and he didn't even bother to
> look for it so there might be a mopar upgrade. my question is have any
> of you ever heard of this kit? if it is a mopar part do you know the
> product number? if it's aftermarket who makes it? i really want to do
> this. have any of you ever done this before or heard of it being done?
> money isn't too much of a worry so im not too concerned with the cost.
> a friend suggested that i go to a junkyard and pull the computer and
> all the associated wiring of a newer cherokee, but i don't know if
> it's just that simple. any input would be greatly appreciated. thanks
> in advance!
>
> james morrow

Re: 4.0 vs 4.0HO?
 

it's not that simple. the HO model has the intake ports set higher up on
the head. it's not just a computer swap. to do it right, you would have to
get the head, intake and computer plus wiring off a junkyard jeep. you may
have to get all the sensors too, like the cps, etc. google "4.0 head" or
something like that.

"James Morrow" <tahoejeebs@aol.com> wrote in message
news:c7c3e39b.0405312257.14003cd0@posting.google.c om...
> hey everyone! got a question for all you jeep gurus out there... i'm
> sure that someone can answer my question for me. ok, i have an 88
> cherokee with the 4.0 in it. now i remember a while back when i was
> just searching around reading articles someone said that the only
> difference between the regular 4.0 and the high output was the
> computer? the old was made by bendix if i remember right? anyways, in
> the same post i read that when they switched over to the high output
> they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
> went to my local jeep dealership's parts dept to talk to them, and
> they said that they haven't heard of it and if it does exist then it
> was probably made by an aftermarket manufacturer. however, he didn't
> seem like the smartest guy in the world and he didn't even bother to
> look for it so there might be a mopar upgrade. my question is have any
> of you ever heard of this kit? if it is a mopar part do you know the
> product number? if it's aftermarket who makes it? i really want to do
> this. have any of you ever done this before or heard of it being done?
> money isn't too much of a worry so im not too concerned with the cost.
> a friend suggested that i go to a junkyard and pull the computer and
> all the associated wiring of a newer cherokee, but i don't know if
> it's just that simple. any input would be greatly appreciated. thanks
> in advance!
>
> james morrow

Re: 4.0 vs 4.0HO?
 

I don't think what you'll gain will be worth the time or expense, however you do
it, but I'm sure it could be done.

There was a Mopar fuel injection kit that was made to replace the carb and
feedback system on the 4.2L Jeeps. I believe it was made by Hesco. I don't
know how much is interchangeable with the 4.0L, but if you were willing to work
hard enough, and spend enough, you could probably make it work.

I wouldn't do it.

In message <c7c3e39b.0405312257.14003cd0@posting.google.com >, "James Morrow"
wrote:

>hey everyone! got a question for all you jeep gurus out there... i'm
>sure that someone can answer my question for me. ok, i have an 88
>cherokee with the 4.0 in it. now i remember a while back when i was
>just searching around reading articles someone said that the only
>difference between the regular 4.0 and the high output was the
>computer? the old was made by bendix if i remember right? anyways, in
>the same post i read that when they switched over to the high output
>they offered a mopar upgrade kit to turn the old 4.0 into the HO. i
>went to my local jeep dealership's parts dept to talk to them, and
>they said that they haven't heard of it and if it does exist then it
>was probably made by an aftermarket manufacturer. however, he didn't
>seem like the smartest guy in the world and he didn't even bother to
>look for it so there might be a mopar upgrade. my question is have any
>of you ever heard of this kit? if it is a mopar part do you know the
>product number? if it's aftermarket who makes it? i really want to do
>this. have any of you ever done this before or heard of it being done?
>money isn't too much of a worry so im not too concerned with the cost.
>a friend suggested that i go to a junkyard and pull the computer and
>all the associated wiring of a newer cherokee, but i don't know if
>it's just that simple. any input would be greatly appreciated. thanks
>in advance!
>
>james morrow