Right you are. My mistake. I conveniently overlooked the 4 banger part.

Scott
91YJ
"Earle Horton" <earle@vascongau.usa> wrote in message
news:459af9f8$0$3517$a82e2bb9@reader.athenanews.co m...
> "Steve Foley" <steve.foley@DELETEatt.net> wrote in message
> news:DDCmh.629877$QZ1.189511@bgtnsc04-news.ops.worldnet.att.net...
>> "reconair" <reconair@staffnet.com> wrote in message
>> news:12pls91evrk9p4c@corp.supernews.com...
>> > 87YJ is carbuerated, not FI.
>>
>> I thought the four-banger was injected. I could be wrong. My 87 YJ
>> has a 258 (as did my 73 Cherokee and 78 CJ)
>>
> All the four banger AMC engines are fuel injected in the YJ. In 1991 they
> went from throttle body to MPI. The six bangers went from carburetor to
> MPI
> in 1990. I am not sure of the exact manufacturing dates. Service and
> replacement procedures are going to be different for the OP's throttle
> body
> FI than for the later model, more common MPI.
>
> Earle
>
>

 

Right you are. My mistake. I conveniently overlooked the 4 banger part.

Scott
91YJ
"Earle Horton" <earle@vascongau.usa> wrote in message
news:459af9f8$0$3517$a82e2bb9@reader.athenanews.co m...
> "Steve Foley" <steve.foley@DELETEatt.net> wrote in message
> news:DDCmh.629877$QZ1.189511@bgtnsc04-news.ops.worldnet.att.net...
>> "reconair" <reconair@staffnet.com> wrote in message
>> news:12pls91evrk9p4c@corp.supernews.com...
>> > 87YJ is carbuerated, not FI.
>>
>> I thought the four-banger was injected. I could be wrong. My 87 YJ
>> has a 258 (as did my 73 Cherokee and 78 CJ)
>>
> All the four banger AMC engines are fuel injected in the YJ. In 1991 they
> went from throttle body to MPI. The six bangers went from carburetor to
> MPI
> in 1990. I am not sure of the exact manufacturing dates. Service and
> replacement procedures are going to be different for the OP's throttle
> body
> FI than for the later model, more common MPI.
>
> Earle
>
>

 

Many people do, but when you have them race balanced, install a wild cam,
override the rev limiter, and install double injectors you can get a lot of
power out of them. (I wish.)

Earle

"reconair" <reconair@staffnet.com> wrote in message
news:12pmdc56039sn79@corp.supernews.com...
> Right you are. My mistake. I conveniently overlooked the 4 banger part.
>
> Scott
> 91YJ
> "Earle Horton" <earle@vascongau.usa> wrote in message
> news:459af9f8$0$3517$a82e2bb9@reader.athenanews.co m...
> > "Steve Foley" <steve.foley@DELETEatt.net> wrote in message
> > news:DDCmh.629877$QZ1.189511@bgtnsc04-news.ops.worldnet.att.net...
> >> "reconair" <reconair@staffnet.com> wrote in message
> >> news:12pls91evrk9p4c@corp.supernews.com...
> >> > 87YJ is carbuerated, not FI.
> >>
> >> I thought the four-banger was injected. I could be wrong. My 87 YJ
> >> has a 258 (as did my 73 Cherokee and 78 CJ)
> >>
> > All the four banger AMC engines are fuel injected in the YJ. In 1991
they
> > went from throttle body to MPI. The six bangers went from carburetor to
> > MPI
> > in 1990. I am not sure of the exact manufacturing dates. Service and
> > replacement procedures are going to be different for the OP's throttle
> > body
> > FI than for the later model, more common MPI.
> >
> > Earle
> >
> >
>
>

 

Many people do, but when you have them race balanced, install a wild cam,
override the rev limiter, and install double injectors you can get a lot of
power out of them. (I wish.)

Earle

"reconair" <reconair@staffnet.com> wrote in message
news:12pmdc56039sn79@corp.supernews.com...
> Right you are. My mistake. I conveniently overlooked the 4 banger part.
>
> Scott
> 91YJ
> "Earle Horton" <earle@vascongau.usa> wrote in message
> news:459af9f8$0$3517$a82e2bb9@reader.athenanews.co m...
> > "Steve Foley" <steve.foley@DELETEatt.net> wrote in message
> > news:DDCmh.629877$QZ1.189511@bgtnsc04-news.ops.worldnet.att.net...
> >> "reconair" <reconair@staffnet.com> wrote in message
> >> news:12pls91evrk9p4c@corp.supernews.com...
> >> > 87YJ is carbuerated, not FI.
> >>
> >> I thought the four-banger was injected. I could be wrong. My 87 YJ
> >> has a 258 (as did my 73 Cherokee and 78 CJ)
> >>
> > All the four banger AMC engines are fuel injected in the YJ. In 1991
they
> > went from throttle body to MPI. The six bangers went from carburetor to
> > MPI
> > in 1990. I am not sure of the exact manufacturing dates. Service and
> > replacement procedures are going to be different for the OP's throttle
> > body
> > FI than for the later model, more common MPI.
> >
> > Earle
> >
> >
>
>

 

Many people do, but when you have them race balanced, install a wild cam,
override the rev limiter, and install double injectors you can get a lot of
power out of them. (I wish.)

Earle

"reconair" <reconair@staffnet.com> wrote in message
news:12pmdc56039sn79@corp.supernews.com...
> Right you are. My mistake. I conveniently overlooked the 4 banger part.
>
> Scott
> 91YJ
> "Earle Horton" <earle@vascongau.usa> wrote in message
> news:459af9f8$0$3517$a82e2bb9@reader.athenanews.co m...
> > "Steve Foley" <steve.foley@DELETEatt.net> wrote in message
> > news:DDCmh.629877$QZ1.189511@bgtnsc04-news.ops.worldnet.att.net...
> >> "reconair" <reconair@staffnet.com> wrote in message
> >> news:12pls91evrk9p4c@corp.supernews.com...
> >> > 87YJ is carbuerated, not FI.
> >>
> >> I thought the four-banger was injected. I could be wrong. My 87 YJ
> >> has a 258 (as did my 73 Cherokee and 78 CJ)
> >>
> > All the four banger AMC engines are fuel injected in the YJ. In 1991
they
> > went from throttle body to MPI. The six bangers went from carburetor to
> > MPI
> > in 1990. I am not sure of the exact manufacturing dates. Service and
> > replacement procedures are going to be different for the OP's throttle
> > body
> > FI than for the later model, more common MPI.
> >
> > Earle
> >
> >
>
>

 

EGR valve sticking open?

Spdloader





"Boog44" <hoosierfan666@yahoo.com> wrote in message
news:fb0622e9c1e761fabdfe8556c3b16af1@localhost.ta lkaboutautos.com...
> Well Jeep people, My 87 YJ 4cyl. is hitting me again!!!! I can drive it
> once per day and as long as I leave it running it is fine but, as soon as
> i get to where I'm going and shut it off, restarting it isn't bad but it
> doesn't idle as good and it dosen't have the same power it had. Lots of
> coughing and spitting, a backfire here and there like it's having trouble
> getting a constant flow of fuel. Help me!!!!
>

 

EGR valve sticking open?

Spdloader





"Boog44" <hoosierfan666@yahoo.com> wrote in message
news:fb0622e9c1e761fabdfe8556c3b16af1@localhost.ta lkaboutautos.com...
> Well Jeep people, My 87 YJ 4cyl. is hitting me again!!!! I can drive it
> once per day and as long as I leave it running it is fine but, as soon as
> i get to where I'm going and shut it off, restarting it isn't bad but it
> doesn't idle as good and it dosen't have the same power it had. Lots of
> coughing and spitting, a backfire here and there like it's having trouble
> getting a constant flow of fuel. Help me!!!!
>

 

EGR valve sticking open?

Spdloader





"Boog44" <hoosierfan666@yahoo.com> wrote in message
news:fb0622e9c1e761fabdfe8556c3b16af1@localhost.ta lkaboutautos.com...
> Well Jeep people, My 87 YJ 4cyl. is hitting me again!!!! I can drive it
> once per day and as long as I leave it running it is fine but, as soon as
> i get to where I'm going and shut it off, restarting it isn't bad but it
> doesn't idle as good and it dosen't have the same power it had. Lots of
> coughing and spitting, a backfire here and there like it's having trouble
> getting a constant flow of fuel. Help me!!!!
>

 

I would definately check/ replace your O2 sensor. This would give you
the sporadic symptoms and in an 87 you probably have 150,000+ miles
anyway...so its time to replace. Good Luck

Adam

On Jan 3, 1:35 am, "Spdloader" <askfo...@nospam.triad.rr.com> wrote:
> EGR valve sticking open?
>
> Spdloader
>
> "Boog44" <hoosierfan...@yahoo.com> wrote in messagenews:fb0622e9c1e761fabdfe8556c3b16af1@local host.talkaboutautos.com...
>
> > Well Jeep people, My 87 YJ 4cyl. is hitting me again!!!! I can drive it
> > once per day and as long as I leave it running it is fine but, as soon as
> > i get to where I'm going and shut it off, restarting it isn't bad but it
> > doesn't idle as good and it dosen't have the same power it had. Lots of
> > coughing and spitting, a backfire here and there like it's having trouble
> > getting a constant flow of fuel. Help me!!!!

 

I would definately check/ replace your O2 sensor. This would give you
the sporadic symptoms and in an 87 you probably have 150,000+ miles
anyway...so its time to replace. Good Luck

Adam

On Jan 3, 1:35 am, "Spdloader" <askfo...@nospam.triad.rr.com> wrote:
> EGR valve sticking open?
>
> Spdloader
>
> "Boog44" <hoosierfan...@yahoo.com> wrote in messagenews:fb0622e9c1e761fabdfe8556c3b16af1@local host.talkaboutautos.com...
>
> > Well Jeep people, My 87 YJ 4cyl. is hitting me again!!!! I can drive it
> > once per day and as long as I leave it running it is fine but, as soon as
> > i get to where I'm going and shut it off, restarting it isn't bad but it
> > doesn't idle as good and it dosen't have the same power it had. Lots of
> > coughing and spitting, a backfire here and there like it's having trouble
> > getting a constant flow of fuel. Help me!!!!