92 Cherokee Limited I6
 

Hello,

Over the past week I have been driving my father's 92 Cherokee Limited
with the Inline 6. The car has about 90k miles and is in pretty good
shape. Oil changes and other maintenance are done on schedule.

The problem with the car is that it begins to develop a rough idle with
some mild bucking after the engine warms up. The idle is fine when it
is cold. The engine also seems to be very rough when turning the car
off (almost like it is dieseling).

Any ideas?

Thanks
Josh

Re: 92 Cherokee Limited I6
 

jetterman@gmail.com did pass the time by typing:
> Hello,
>
> Over the past week I have been driving my father's 92 Cherokee Limited
> with the Inline 6. The car has about 90k miles and is in pretty good
> shape. Oil changes and other maintenance are done on schedule.
>
> The problem with the car is that it begins to develop a rough idle with
> some mild bucking after the engine warms up. The idle is fine when it
> is cold. The engine also seems to be very rough when turning the car
> off (almost like it is dieseling).
>
> Any ideas?

Lots. Some of them even good. :]

How old is the ignition system? Plugs/wires/cap/rotor/coil

I'd start cheap and clean the throttle body and Idle Air Passage.
http://revbeergoggles.com/tb/tb.html

Run-on is hard to do in a fuel-injected vehicle. That can be a leaky
injector in combination with carbon buildup.

Bucking when hot in idle can be a failing coil or a timing issue.
You might want to check if there was an ignition recall for your Jeep.
I just replaced my coil with NAPA IC409. It's a coil and new harness
that made one heck of a lot of improvement.

If it's ticking from the distributor, pop the top off and see if you
can wiggle it. If the rotor moves side to side then the bushing is
shot and you either need to replace the distributor or have a new
bushing pressed in. For ref: http://revbeergoggles.com/distributor/

Dunno if that year had a EGR (exhaust gas recirculation) valve but
when one of those sticks it cause all sorts of stumble when warm.
(my 93ZJ doesn't have one)

--
DougW

Re: 92 Cherokee Limited I6
 

jetterman@gmail.com did pass the time by typing:
> Hello,
>
> Over the past week I have been driving my father's 92 Cherokee Limited
> with the Inline 6. The car has about 90k miles and is in pretty good
> shape. Oil changes and other maintenance are done on schedule.
>
> The problem with the car is that it begins to develop a rough idle with
> some mild bucking after the engine warms up. The idle is fine when it
> is cold. The engine also seems to be very rough when turning the car
> off (almost like it is dieseling).
>
> Any ideas?

Lots. Some of them even good. :]

How old is the ignition system? Plugs/wires/cap/rotor/coil

I'd start cheap and clean the throttle body and Idle Air Passage.
http://revbeergoggles.com/tb/tb.html

Run-on is hard to do in a fuel-injected vehicle. That can be a leaky
injector in combination with carbon buildup.

Bucking when hot in idle can be a failing coil or a timing issue.
You might want to check if there was an ignition recall for your Jeep.
I just replaced my coil with NAPA IC409. It's a coil and new harness
that made one heck of a lot of improvement.

If it's ticking from the distributor, pop the top off and see if you
can wiggle it. If the rotor moves side to side then the bushing is
shot and you either need to replace the distributor or have a new
bushing pressed in. For ref: http://revbeergoggles.com/distributor/

Dunno if that year had a EGR (exhaust gas recirculation) valve but
when one of those sticks it cause all sorts of stumble when warm.
(my 93ZJ doesn't have one)

--
DougW

Re: 92 Cherokee Limited I6
 

jetterman@gmail.com did pass the time by typing:
> Hello,
>
> Over the past week I have been driving my father's 92 Cherokee Limited
> with the Inline 6. The car has about 90k miles and is in pretty good
> shape. Oil changes and other maintenance are done on schedule.
>
> The problem with the car is that it begins to develop a rough idle with
> some mild bucking after the engine warms up. The idle is fine when it
> is cold. The engine also seems to be very rough when turning the car
> off (almost like it is dieseling).
>
> Any ideas?

Lots. Some of them even good. :]

How old is the ignition system? Plugs/wires/cap/rotor/coil

I'd start cheap and clean the throttle body and Idle Air Passage.
http://revbeergoggles.com/tb/tb.html

Run-on is hard to do in a fuel-injected vehicle. That can be a leaky
injector in combination with carbon buildup.

Bucking when hot in idle can be a failing coil or a timing issue.
You might want to check if there was an ignition recall for your Jeep.
I just replaced my coil with NAPA IC409. It's a coil and new harness
that made one heck of a lot of improvement.

If it's ticking from the distributor, pop the top off and see if you
can wiggle it. If the rotor moves side to side then the bushing is
shot and you either need to replace the distributor or have a new
bushing pressed in. For ref: http://revbeergoggles.com/distributor/

Dunno if that year had a EGR (exhaust gas recirculation) valve but
when one of those sticks it cause all sorts of stumble when warm.
(my 93ZJ doesn't have one)

--
DougW

Re: 92 Cherokee Limited I6
 

jetterman@gmail.com did pass the time by typing:
> Hello,
>
> Over the past week I have been driving my father's 92 Cherokee Limited
> with the Inline 6. The car has about 90k miles and is in pretty good
> shape. Oil changes and other maintenance are done on schedule.
>
> The problem with the car is that it begins to develop a rough idle with
> some mild bucking after the engine warms up. The idle is fine when it
> is cold. The engine also seems to be very rough when turning the car
> off (almost like it is dieseling).
>
> Any ideas?

Lots. Some of them even good. :]

How old is the ignition system? Plugs/wires/cap/rotor/coil

I'd start cheap and clean the throttle body and Idle Air Passage.
http://revbeergoggles.com/tb/tb.html

Run-on is hard to do in a fuel-injected vehicle. That can be a leaky
injector in combination with carbon buildup.

Bucking when hot in idle can be a failing coil or a timing issue.
You might want to check if there was an ignition recall for your Jeep.
I just replaced my coil with NAPA IC409. It's a coil and new harness
that made one heck of a lot of improvement.

If it's ticking from the distributor, pop the top off and see if you
can wiggle it. If the rotor moves side to side then the bushing is
shot and you either need to replace the distributor or have a new
bushing pressed in. For ref: http://revbeergoggles.com/distributor/

Dunno if that year had a EGR (exhaust gas recirculation) valve but
when one of those sticks it cause all sorts of stumble when warm.
(my 93ZJ doesn't have one)

--
DougW

Re: 92 Cherokee Limited I6
 

could be oxygen sensor too, sounds very similar to what happened to me not
long ago. new sensor fixed it.
<jetterman@gmail.com> wrote in message
news:1142272709.746014.289000@i40g2000cwc.googlegr oups.com...
> Hello,
>
> Over the past week I have been driving my father's 92 Cherokee Limited
> with the Inline 6. The car has about 90k miles and is in pretty good
> shape. Oil changes and other maintenance are done on schedule.
>
> The problem with the car is that it begins to develop a rough idle with
> some mild bucking after the engine warms up. The idle is fine when it
> is cold. The engine also seems to be very rough when turning the car
> off (almost like it is dieseling).
>
> Any ideas?
>
> Thanks
> Josh
>

Re: 92 Cherokee Limited I6
 

could be oxygen sensor too, sounds very similar to what happened to me not
long ago. new sensor fixed it.
<jetterman@gmail.com> wrote in message
news:1142272709.746014.289000@i40g2000cwc.googlegr oups.com...
> Hello,
>
> Over the past week I have been driving my father's 92 Cherokee Limited
> with the Inline 6. The car has about 90k miles and is in pretty good
> shape. Oil changes and other maintenance are done on schedule.
>
> The problem with the car is that it begins to develop a rough idle with
> some mild bucking after the engine warms up. The idle is fine when it
> is cold. The engine also seems to be very rough when turning the car
> off (almost like it is dieseling).
>
> Any ideas?
>
> Thanks
> Josh
>

Re: 92 Cherokee Limited I6
 

could be oxygen sensor too, sounds very similar to what happened to me not
long ago. new sensor fixed it.
<jetterman@gmail.com> wrote in message
news:1142272709.746014.289000@i40g2000cwc.googlegr oups.com...
> Hello,
>
> Over the past week I have been driving my father's 92 Cherokee Limited
> with the Inline 6. The car has about 90k miles and is in pretty good
> shape. Oil changes and other maintenance are done on schedule.
>
> The problem with the car is that it begins to develop a rough idle with
> some mild bucking after the engine warms up. The idle is fine when it
> is cold. The engine also seems to be very rough when turning the car
> off (almost like it is dieseling).
>
> Any ideas?
>
> Thanks
> Josh
>

Re: 92 Cherokee Limited I6
 

could be oxygen sensor too, sounds very similar to what happened to me not
long ago. new sensor fixed it.
<jetterman@gmail.com> wrote in message
news:1142272709.746014.289000@i40g2000cwc.googlegr oups.com...
> Hello,
>
> Over the past week I have been driving my father's 92 Cherokee Limited
> with the Inline 6. The car has about 90k miles and is in pretty good
> shape. Oil changes and other maintenance are done on schedule.
>
> The problem with the car is that it begins to develop a rough idle with
> some mild bucking after the engine warms up. The idle is fine when it
> is cold. The engine also seems to be very rough when turning the car
> off (almost like it is dieseling).
>
> Any ideas?
>
> Thanks
> Josh
>

Re: 92 Cherokee Limited I6
 

I concur, I had same symptoms and it was a faulty 02 sensor......JK