91' Cherokee, please somebody help me
 

Guys, I have 91' XJ 4.0 litre, auto transmission. Something strange happens
when I try to accelerate. Engine comes to about 2000 and some more RPM and
then stalls or looses breath. Then, after I pass maybe to 2500 it
accelerates like rocket. Strange thing. Few weeks ago I posted this question
here but no answer. Since then, new fuel pressure regulator was installed,
new spark plugs and wires, distributor cap... etc. Nothing better. I've
noticed that it happens more with warm engine, less with cold.
Can it be something with crankshaft position sensor? This one I haven't
pulled out yet, it's very hard to reach down there. Car has exactly 200 000
kilometres (about 124 000 miles) and catalysator is still original, is it
too much?
Please I will really appreciate your help, you are my only hope. I live in
part of Europe where only few Cherokees are around and no chance to ask
anybody something serious about Jeep.
Thanks.
Davie

Re: 91' Cherokee, please somebody help me
 

Davey did pass the time by typing:
> Guys, I have 91' XJ 4.0 litre, auto transmission. Something strange happens
> when I try to accelerate. Engine comes to about 2000 and some more RPM and
> then stalls or looses breath. Then, after I pass maybe to 2500 it
> accelerates like rocket. Strange thing. Few weeks ago I posted this question
> here but no answer. Since then, new fuel pressure regulator was installed,
> new spark plugs and wires, distributor cap... etc. Nothing better. I've
> noticed that it happens more with warm engine, less with cold.
> Can it be something with crankshaft position sensor? This one I haven't
> pulled out yet, it's very hard to reach down there.

The CPS sensor is a major pain to get at. IF you ever have to I did a
short write-up. http://members.cox.net/wilsond/cps/

> Car has exactly 200 000
> kilometres (about 124 000 miles) and catalysator is still original, is it
> too much?

Your pushing it's limit but usually if it cloggs up your engine simply
will not accelerate no matter what. It will feel like your dragging
a ton of lead.

> Please I will really appreciate your help, you are my only hope. I live in
> part of Europe where only few Cherokees are around and no chance to ask
> anybody something serious about Jeep.

no-start or engine cut-out is usually due to a failing CPS sensor.

What your explaining is a shift problem. Good acceleration past that RPM tells
me the engine is probably fine. I'd be looking at the kickdown cable to the
transmission and the trasmission itself. I suspect the bands for first gear
may be out of adjustment. How long has it been since you changed the
transmission fluid and filter?

--
-- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

Re: 91' Cherokee, please somebody help me
 

Davey did pass the time by typing:
> Guys, I have 91' XJ 4.0 litre, auto transmission. Something strange happens
> when I try to accelerate. Engine comes to about 2000 and some more RPM and
> then stalls or looses breath. Then, after I pass maybe to 2500 it
> accelerates like rocket. Strange thing. Few weeks ago I posted this question
> here but no answer. Since then, new fuel pressure regulator was installed,
> new spark plugs and wires, distributor cap... etc. Nothing better. I've
> noticed that it happens more with warm engine, less with cold.
> Can it be something with crankshaft position sensor? This one I haven't
> pulled out yet, it's very hard to reach down there.

The CPS sensor is a major pain to get at. IF you ever have to I did a
short write-up. http://members.cox.net/wilsond/cps/

> Car has exactly 200 000
> kilometres (about 124 000 miles) and catalysator is still original, is it
> too much?

Your pushing it's limit but usually if it cloggs up your engine simply
will not accelerate no matter what. It will feel like your dragging
a ton of lead.

> Please I will really appreciate your help, you are my only hope. I live in
> part of Europe where only few Cherokees are around and no chance to ask
> anybody something serious about Jeep.

no-start or engine cut-out is usually due to a failing CPS sensor.

What your explaining is a shift problem. Good acceleration past that RPM tells
me the engine is probably fine. I'd be looking at the kickdown cable to the
transmission and the trasmission itself. I suspect the bands for first gear
may be out of adjustment. How long has it been since you changed the
transmission fluid and filter?

--
-- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

Re: 91' Cherokee, please somebody help me
 

Davey did pass the time by typing:
> Guys, I have 91' XJ 4.0 litre, auto transmission. Something strange happens
> when I try to accelerate. Engine comes to about 2000 and some more RPM and
> then stalls or looses breath. Then, after I pass maybe to 2500 it
> accelerates like rocket. Strange thing. Few weeks ago I posted this question
> here but no answer. Since then, new fuel pressure regulator was installed,
> new spark plugs and wires, distributor cap... etc. Nothing better. I've
> noticed that it happens more with warm engine, less with cold.
> Can it be something with crankshaft position sensor? This one I haven't
> pulled out yet, it's very hard to reach down there.

The CPS sensor is a major pain to get at. IF you ever have to I did a
short write-up. http://members.cox.net/wilsond/cps/

> Car has exactly 200 000
> kilometres (about 124 000 miles) and catalysator is still original, is it
> too much?

Your pushing it's limit but usually if it cloggs up your engine simply
will not accelerate no matter what. It will feel like your dragging
a ton of lead.

> Please I will really appreciate your help, you are my only hope. I live in
> part of Europe where only few Cherokees are around and no chance to ask
> anybody something serious about Jeep.

no-start or engine cut-out is usually due to a failing CPS sensor.

What your explaining is a shift problem. Good acceleration past that RPM tells
me the engine is probably fine. I'd be looking at the kickdown cable to the
transmission and the trasmission itself. I suspect the bands for first gear
may be out of adjustment. How long has it been since you changed the
transmission fluid and filter?

--
-- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

Re: 91' Cherokee, please somebody help me
 

> The CPS sensor is a major pain to get at. IF you ever have to I did a
> short write-up. http://members.cox.net/wilsond/cps/
>
>> Car has exactly 200 000
>> kilometres (about 124 000 miles) and catalysator is still original, is it
>> too much?
>
> Your pushing it's limit but usually if it cloggs up your engine simply
> will not accelerate no matter what. It will feel like your dragging
> a ton of lead.

> no-start or engine cut-out is usually due to a failing CPS sensor.
>
> What your explaining is a shift problem. Good acceleration past that RPM
> tells
> me the engine is probably fine. I'd be looking at the kickdown cable to
> the
> transmission and the trasmission itself. I suspect the bands for first
> gear
> may be out of adjustment. How long has it been since you changed the
> transmission fluid and filter?
I was planning to do this one of those days. Question is how to drain
converter too? I don't know what brand of oil is inside so it would be
better to drain it all, I think. Trans fluid filter I can get only from USA
and it will take time - I've never removed this before, can I wash and blow
this filter with compressed air?
For this shifting matter, Jeep is in same gear when problem occurs, I mean,
for example, in first gear it comes to as I said till about 2000 and some
more, then "hole" in power and after 2400 it goes like hell. Still in same
gear. After it shifts in another gear - thing continues. Sometimes it
accelerates without problem and usually when engine is still colder.

> --
> -- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
> Banks Header - and BEER, in the fridge!
>
>

Re: 91' Cherokee, please somebody help me
 

> The CPS sensor is a major pain to get at. IF you ever have to I did a
> short write-up. http://members.cox.net/wilsond/cps/
>
>> Car has exactly 200 000
>> kilometres (about 124 000 miles) and catalysator is still original, is it
>> too much?
>
> Your pushing it's limit but usually if it cloggs up your engine simply
> will not accelerate no matter what. It will feel like your dragging
> a ton of lead.

> no-start or engine cut-out is usually due to a failing CPS sensor.
>
> What your explaining is a shift problem. Good acceleration past that RPM
> tells
> me the engine is probably fine. I'd be looking at the kickdown cable to
> the
> transmission and the trasmission itself. I suspect the bands for first
> gear
> may be out of adjustment. How long has it been since you changed the
> transmission fluid and filter?
I was planning to do this one of those days. Question is how to drain
converter too? I don't know what brand of oil is inside so it would be
better to drain it all, I think. Trans fluid filter I can get only from USA
and it will take time - I've never removed this before, can I wash and blow
this filter with compressed air?
For this shifting matter, Jeep is in same gear when problem occurs, I mean,
for example, in first gear it comes to as I said till about 2000 and some
more, then "hole" in power and after 2400 it goes like hell. Still in same
gear. After it shifts in another gear - thing continues. Sometimes it
accelerates without problem and usually when engine is still colder.

> --
> -- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
> Banks Header - and BEER, in the fridge!
>
>

Re: 91' Cherokee, please somebody help me
 

> The CPS sensor is a major pain to get at. IF you ever have to I did a
> short write-up. http://members.cox.net/wilsond/cps/
>
>> Car has exactly 200 000
>> kilometres (about 124 000 miles) and catalysator is still original, is it
>> too much?
>
> Your pushing it's limit but usually if it cloggs up your engine simply
> will not accelerate no matter what. It will feel like your dragging
> a ton of lead.

> no-start or engine cut-out is usually due to a failing CPS sensor.
>
> What your explaining is a shift problem. Good acceleration past that RPM
> tells
> me the engine is probably fine. I'd be looking at the kickdown cable to
> the
> transmission and the trasmission itself. I suspect the bands for first
> gear
> may be out of adjustment. How long has it been since you changed the
> transmission fluid and filter?
I was planning to do this one of those days. Question is how to drain
converter too? I don't know what brand of oil is inside so it would be
better to drain it all, I think. Trans fluid filter I can get only from USA
and it will take time - I've never removed this before, can I wash and blow
this filter with compressed air?
For this shifting matter, Jeep is in same gear when problem occurs, I mean,
for example, in first gear it comes to as I said till about 2000 and some
more, then "hole" in power and after 2400 it goes like hell. Still in same
gear. After it shifts in another gear - thing continues. Sometimes it
accelerates without problem and usually when engine is still colder.

> --
> -- DougW -- 93 ZJ 4.0 http://members.cox.net/wilsond
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
> Banks Header - and BEER, in the fridge!
>
>

Re: 91' Cherokee, please somebody help me
 

For your stalling problem, have you checked or replaced your throttle
position senson? I think your 91 has a HO engine and the throttle position
sensor is not adjustble. You can meter the readings to test it. As for your
trans filter, it's a fine metal screen and you can use brake or carb cleaner
to clean it. Just make sure it's dry before reusing. I don't think you can
drain the converter, just change the fluid twice and you'll have gotten most
of it.

JoBo

"Davey" <dejvis.pale@du.t-com.hr> wrote in message
news:cpfv74$hm0$1@ls219.htnet.hr...
> Guys, I have 91' XJ 4.0 litre, auto transmission. Something strange
> happens when I try to accelerate. Engine comes to about 2000 and some more
> RPM and then stalls or looses breath. Then, after I pass maybe to 2500 it
> accelerates like rocket. Strange thing. Few weeks ago I posted this
> question here but no answer. Since then, new fuel pressure regulator was
> installed, new spark plugs and wires, distributor cap... etc. Nothing
> better. I've noticed that it happens more with warm engine, less with
> cold.
> Can it be something with crankshaft position sensor? This one I haven't
> pulled out yet, it's very hard to reach down there. Car has exactly 200
> 000 kilometres (about 124 000 miles) and catalysator is still original, is
> it too much?
> Please I will really appreciate your help, you are my only hope. I live in
> part of Europe where only few Cherokees are around and no chance to ask
> anybody something serious about Jeep.
> Thanks.
> Davie
>

Re: 91' Cherokee, please somebody help me
 

For your stalling problem, have you checked or replaced your throttle
position senson? I think your 91 has a HO engine and the throttle position
sensor is not adjustble. You can meter the readings to test it. As for your
trans filter, it's a fine metal screen and you can use brake or carb cleaner
to clean it. Just make sure it's dry before reusing. I don't think you can
drain the converter, just change the fluid twice and you'll have gotten most
of it.

JoBo

"Davey" <dejvis.pale@du.t-com.hr> wrote in message
news:cpfv74$hm0$1@ls219.htnet.hr...
> Guys, I have 91' XJ 4.0 litre, auto transmission. Something strange
> happens when I try to accelerate. Engine comes to about 2000 and some more
> RPM and then stalls or looses breath. Then, after I pass maybe to 2500 it
> accelerates like rocket. Strange thing. Few weeks ago I posted this
> question here but no answer. Since then, new fuel pressure regulator was
> installed, new spark plugs and wires, distributor cap... etc. Nothing
> better. I've noticed that it happens more with warm engine, less with
> cold.
> Can it be something with crankshaft position sensor? This one I haven't
> pulled out yet, it's very hard to reach down there. Car has exactly 200
> 000 kilometres (about 124 000 miles) and catalysator is still original, is
> it too much?
> Please I will really appreciate your help, you are my only hope. I live in
> part of Europe where only few Cherokees are around and no chance to ask
> anybody something serious about Jeep.
> Thanks.
> Davie
>

Re: 91' Cherokee, please somebody help me
 

For your stalling problem, have you checked or replaced your throttle
position senson? I think your 91 has a HO engine and the throttle position
sensor is not adjustble. You can meter the readings to test it. As for your
trans filter, it's a fine metal screen and you can use brake or carb cleaner
to clean it. Just make sure it's dry before reusing. I don't think you can
drain the converter, just change the fluid twice and you'll have gotten most
of it.

JoBo

"Davey" <dejvis.pale@du.t-com.hr> wrote in message
news:cpfv74$hm0$1@ls219.htnet.hr...
> Guys, I have 91' XJ 4.0 litre, auto transmission. Something strange
> happens when I try to accelerate. Engine comes to about 2000 and some more
> RPM and then stalls or looses breath. Then, after I pass maybe to 2500 it
> accelerates like rocket. Strange thing. Few weeks ago I posted this
> question here but no answer. Since then, new fuel pressure regulator was
> installed, new spark plugs and wires, distributor cap... etc. Nothing
> better. I've noticed that it happens more with warm engine, less with
> cold.
> Can it be something with crankshaft position sensor? This one I haven't
> pulled out yet, it's very hard to reach down there. Car has exactly 200
> 000 kilometres (about 124 000 miles) and catalysator is still original, is
> it too much?
> Please I will really appreciate your help, you are my only hope. I live in
> part of Europe where only few Cherokees are around and no chance to ask
> anybody something serious about Jeep.
> Thanks.
> Davie
>