91' Cherokee, please somebody help me
#11
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
I would first be suspecting a dirty connection on the TPS or a worn
one.
I would take off the TPS plug and clean it (the plug and socket) with a
contact cleaner spray. WD40 will do in a pinch, but isn't the best.
The TPS can be checked with a meter as well. You can use resistance and
watch if it gets higher smoothly as the throttle opens on 2 of the pins
and watch it get lower on the other pin. (3 pin plug I think with one
common) You can leave it plugged in with the key just 'on' but the
engine off and check the voltage by backfeeding the plug. Same deal, 2
pins will get higher and the other one with center will get lower. It
needs to rise or lower smoothly ranging from 0.02V to 4.8V.
Second I would be thinking fuel filter. It is on the frame rail back by
the tank.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Davey wrote:
>
> 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
one.
I would take off the TPS plug and clean it (the plug and socket) with a
contact cleaner spray. WD40 will do in a pinch, but isn't the best.
The TPS can be checked with a meter as well. You can use resistance and
watch if it gets higher smoothly as the throttle opens on 2 of the pins
and watch it get lower on the other pin. (3 pin plug I think with one
common) You can leave it plugged in with the key just 'on' but the
engine off and check the voltage by backfeeding the plug. Same deal, 2
pins will get higher and the other one with center will get lower. It
needs to rise or lower smoothly ranging from 0.02V to 4.8V.
Second I would be thinking fuel filter. It is on the frame rail back by
the tank.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Davey wrote:
>
> 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
#12
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
I would first be suspecting a dirty connection on the TPS or a worn
one.
I would take off the TPS plug and clean it (the plug and socket) with a
contact cleaner spray. WD40 will do in a pinch, but isn't the best.
The TPS can be checked with a meter as well. You can use resistance and
watch if it gets higher smoothly as the throttle opens on 2 of the pins
and watch it get lower on the other pin. (3 pin plug I think with one
common) You can leave it plugged in with the key just 'on' but the
engine off and check the voltage by backfeeding the plug. Same deal, 2
pins will get higher and the other one with center will get lower. It
needs to rise or lower smoothly ranging from 0.02V to 4.8V.
Second I would be thinking fuel filter. It is on the frame rail back by
the tank.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Davey wrote:
>
> 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
one.
I would take off the TPS plug and clean it (the plug and socket) with a
contact cleaner spray. WD40 will do in a pinch, but isn't the best.
The TPS can be checked with a meter as well. You can use resistance and
watch if it gets higher smoothly as the throttle opens on 2 of the pins
and watch it get lower on the other pin. (3 pin plug I think with one
common) You can leave it plugged in with the key just 'on' but the
engine off and check the voltage by backfeeding the plug. Same deal, 2
pins will get higher and the other one with center will get lower. It
needs to rise or lower smoothly ranging from 0.02V to 4.8V.
Second I would be thinking fuel filter. It is on the frame rail back by
the tank.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Davey wrote:
>
> 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
#13
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
I would first be suspecting a dirty connection on the TPS or a worn
one.
I would take off the TPS plug and clean it (the plug and socket) with a
contact cleaner spray. WD40 will do in a pinch, but isn't the best.
The TPS can be checked with a meter as well. You can use resistance and
watch if it gets higher smoothly as the throttle opens on 2 of the pins
and watch it get lower on the other pin. (3 pin plug I think with one
common) You can leave it plugged in with the key just 'on' but the
engine off and check the voltage by backfeeding the plug. Same deal, 2
pins will get higher and the other one with center will get lower. It
needs to rise or lower smoothly ranging from 0.02V to 4.8V.
Second I would be thinking fuel filter. It is on the frame rail back by
the tank.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Davey wrote:
>
> 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
one.
I would take off the TPS plug and clean it (the plug and socket) with a
contact cleaner spray. WD40 will do in a pinch, but isn't the best.
The TPS can be checked with a meter as well. You can use resistance and
watch if it gets higher smoothly as the throttle opens on 2 of the pins
and watch it get lower on the other pin. (3 pin plug I think with one
common) You can leave it plugged in with the key just 'on' but the
engine off and check the voltage by backfeeding the plug. Same deal, 2
pins will get higher and the other one with center will get lower. It
needs to rise or lower smoothly ranging from 0.02V to 4.8V.
Second I would be thinking fuel filter. It is on the frame rail back by
the tank.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Davey wrote:
>
> 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
#14
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
Davey did pass the time by typing:
> 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?
You can't drain the torque converter wihout removing it from the transmission
so there will always be some old transmission fluid in the system. The filter
screen (at least on my ZJ) is metal and can be cleaned in solvent and dried.
I don't know if your filter can be cleaned or not. The brand of transmission
fluid doesn't matter, what matters is the specifications on that fluid.
ATF+3 is what you need.
This is worth a read: http://www.allpar.com/fix/trans.html
> 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.
Your describing a tranny problem similar to "delayed up-shift" or "slips on
1-2 up-shift" Apart from old fluid the following can be causes.
- valve body faulty
- solenoid faulty
- electronic control problem
- throttle cable out of adjustment
- shift cable out of adjustment
Shift cable is the easiest to look at. On your throttle body there
is a link that runs down to the tranny. with the engine off, move the
throttle full open then closed. there shouldn't be any slack in the
kick-down link. IF there is, look on the link, there should be a little
button you can press in. Press that in and take the slack out of the
cable. After you do this, run the throttle full open again. There
shouldn't be any binding.
--
DougW
> 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?
You can't drain the torque converter wihout removing it from the transmission
so there will always be some old transmission fluid in the system. The filter
screen (at least on my ZJ) is metal and can be cleaned in solvent and dried.
I don't know if your filter can be cleaned or not. The brand of transmission
fluid doesn't matter, what matters is the specifications on that fluid.
ATF+3 is what you need.
This is worth a read: http://www.allpar.com/fix/trans.html
> 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.
Your describing a tranny problem similar to "delayed up-shift" or "slips on
1-2 up-shift" Apart from old fluid the following can be causes.
- valve body faulty
- solenoid faulty
- electronic control problem
- throttle cable out of adjustment
- shift cable out of adjustment
Shift cable is the easiest to look at. On your throttle body there
is a link that runs down to the tranny. with the engine off, move the
throttle full open then closed. there shouldn't be any slack in the
kick-down link. IF there is, look on the link, there should be a little
button you can press in. Press that in and take the slack out of the
cable. After you do this, run the throttle full open again. There
shouldn't be any binding.
--
DougW
#15
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
Davey did pass the time by typing:
> 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?
You can't drain the torque converter wihout removing it from the transmission
so there will always be some old transmission fluid in the system. The filter
screen (at least on my ZJ) is metal and can be cleaned in solvent and dried.
I don't know if your filter can be cleaned or not. The brand of transmission
fluid doesn't matter, what matters is the specifications on that fluid.
ATF+3 is what you need.
This is worth a read: http://www.allpar.com/fix/trans.html
> 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.
Your describing a tranny problem similar to "delayed up-shift" or "slips on
1-2 up-shift" Apart from old fluid the following can be causes.
- valve body faulty
- solenoid faulty
- electronic control problem
- throttle cable out of adjustment
- shift cable out of adjustment
Shift cable is the easiest to look at. On your throttle body there
is a link that runs down to the tranny. with the engine off, move the
throttle full open then closed. there shouldn't be any slack in the
kick-down link. IF there is, look on the link, there should be a little
button you can press in. Press that in and take the slack out of the
cable. After you do this, run the throttle full open again. There
shouldn't be any binding.
--
DougW
> 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?
You can't drain the torque converter wihout removing it from the transmission
so there will always be some old transmission fluid in the system. The filter
screen (at least on my ZJ) is metal and can be cleaned in solvent and dried.
I don't know if your filter can be cleaned or not. The brand of transmission
fluid doesn't matter, what matters is the specifications on that fluid.
ATF+3 is what you need.
This is worth a read: http://www.allpar.com/fix/trans.html
> 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.
Your describing a tranny problem similar to "delayed up-shift" or "slips on
1-2 up-shift" Apart from old fluid the following can be causes.
- valve body faulty
- solenoid faulty
- electronic control problem
- throttle cable out of adjustment
- shift cable out of adjustment
Shift cable is the easiest to look at. On your throttle body there
is a link that runs down to the tranny. with the engine off, move the
throttle full open then closed. there shouldn't be any slack in the
kick-down link. IF there is, look on the link, there should be a little
button you can press in. Press that in and take the slack out of the
cable. After you do this, run the throttle full open again. There
shouldn't be any binding.
--
DougW
#16
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
Davey did pass the time by typing:
> 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?
You can't drain the torque converter wihout removing it from the transmission
so there will always be some old transmission fluid in the system. The filter
screen (at least on my ZJ) is metal and can be cleaned in solvent and dried.
I don't know if your filter can be cleaned or not. The brand of transmission
fluid doesn't matter, what matters is the specifications on that fluid.
ATF+3 is what you need.
This is worth a read: http://www.allpar.com/fix/trans.html
> 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.
Your describing a tranny problem similar to "delayed up-shift" or "slips on
1-2 up-shift" Apart from old fluid the following can be causes.
- valve body faulty
- solenoid faulty
- electronic control problem
- throttle cable out of adjustment
- shift cable out of adjustment
Shift cable is the easiest to look at. On your throttle body there
is a link that runs down to the tranny. with the engine off, move the
throttle full open then closed. there shouldn't be any slack in the
kick-down link. IF there is, look on the link, there should be a little
button you can press in. Press that in and take the slack out of the
cable. After you do this, run the throttle full open again. There
shouldn't be any binding.
--
DougW
> 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?
You can't drain the torque converter wihout removing it from the transmission
so there will always be some old transmission fluid in the system. The filter
screen (at least on my ZJ) is metal and can be cleaned in solvent and dried.
I don't know if your filter can be cleaned or not. The brand of transmission
fluid doesn't matter, what matters is the specifications on that fluid.
ATF+3 is what you need.
This is worth a read: http://www.allpar.com/fix/trans.html
> 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.
Your describing a tranny problem similar to "delayed up-shift" or "slips on
1-2 up-shift" Apart from old fluid the following can be causes.
- valve body faulty
- solenoid faulty
- electronic control problem
- throttle cable out of adjustment
- shift cable out of adjustment
Shift cable is the easiest to look at. On your throttle body there
is a link that runs down to the tranny. with the engine off, move the
throttle full open then closed. there shouldn't be any slack in the
kick-down link. IF there is, look on the link, there should be a little
button you can press in. Press that in and take the slack out of the
cable. After you do this, run the throttle full open again. There
shouldn't be any binding.
--
DougW
#17
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
Hmm, I'm going to try some of those things. New fuel filter was installed
about 12000 km ago. I will reply with any news. Thanks guys.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41BC5FFF.AE9571C4@sympatico.ca...
>I would first be suspecting a dirty connection on the TPS or a worn
> one.
> I would take off the TPS plug and clean it (the plug and socket) with a
> contact cleaner spray. WD40 will do in a pinch, but isn't the best.
>
> The TPS can be checked with a meter as well. You can use resistance and
> watch if it gets higher smoothly as the throttle opens on 2 of the pins
> and watch it get lower on the other pin. (3 pin plug I think with one
> common) You can leave it plugged in with the key just 'on' but the
> engine off and check the voltage by backfeeding the plug. Same deal, 2
> pins will get higher and the other one with center will get lower. It
> needs to rise or lower smoothly ranging from 0.02V to 4.8V.
>
> Second I would be thinking fuel filter. It is on the frame rail back by
> the tank.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Davey wrote:
>>
>> 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
about 12000 km ago. I will reply with any news. Thanks guys.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41BC5FFF.AE9571C4@sympatico.ca...
>I would first be suspecting a dirty connection on the TPS or a worn
> one.
> I would take off the TPS plug and clean it (the plug and socket) with a
> contact cleaner spray. WD40 will do in a pinch, but isn't the best.
>
> The TPS can be checked with a meter as well. You can use resistance and
> watch if it gets higher smoothly as the throttle opens on 2 of the pins
> and watch it get lower on the other pin. (3 pin plug I think with one
> common) You can leave it plugged in with the key just 'on' but the
> engine off and check the voltage by backfeeding the plug. Same deal, 2
> pins will get higher and the other one with center will get lower. It
> needs to rise or lower smoothly ranging from 0.02V to 4.8V.
>
> Second I would be thinking fuel filter. It is on the frame rail back by
> the tank.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Davey wrote:
>>
>> 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
#18
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
Hmm, I'm going to try some of those things. New fuel filter was installed
about 12000 km ago. I will reply with any news. Thanks guys.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41BC5FFF.AE9571C4@sympatico.ca...
>I would first be suspecting a dirty connection on the TPS or a worn
> one.
> I would take off the TPS plug and clean it (the plug and socket) with a
> contact cleaner spray. WD40 will do in a pinch, but isn't the best.
>
> The TPS can be checked with a meter as well. You can use resistance and
> watch if it gets higher smoothly as the throttle opens on 2 of the pins
> and watch it get lower on the other pin. (3 pin plug I think with one
> common) You can leave it plugged in with the key just 'on' but the
> engine off and check the voltage by backfeeding the plug. Same deal, 2
> pins will get higher and the other one with center will get lower. It
> needs to rise or lower smoothly ranging from 0.02V to 4.8V.
>
> Second I would be thinking fuel filter. It is on the frame rail back by
> the tank.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Davey wrote:
>>
>> 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
about 12000 km ago. I will reply with any news. Thanks guys.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41BC5FFF.AE9571C4@sympatico.ca...
>I would first be suspecting a dirty connection on the TPS or a worn
> one.
> I would take off the TPS plug and clean it (the plug and socket) with a
> contact cleaner spray. WD40 will do in a pinch, but isn't the best.
>
> The TPS can be checked with a meter as well. You can use resistance and
> watch if it gets higher smoothly as the throttle opens on 2 of the pins
> and watch it get lower on the other pin. (3 pin plug I think with one
> common) You can leave it plugged in with the key just 'on' but the
> engine off and check the voltage by backfeeding the plug. Same deal, 2
> pins will get higher and the other one with center will get lower. It
> needs to rise or lower smoothly ranging from 0.02V to 4.8V.
>
> Second I would be thinking fuel filter. It is on the frame rail back by
> the tank.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Davey wrote:
>>
>> 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
#19
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
Hmm, I'm going to try some of those things. New fuel filter was installed
about 12000 km ago. I will reply with any news. Thanks guys.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41BC5FFF.AE9571C4@sympatico.ca...
>I would first be suspecting a dirty connection on the TPS or a worn
> one.
> I would take off the TPS plug and clean it (the plug and socket) with a
> contact cleaner spray. WD40 will do in a pinch, but isn't the best.
>
> The TPS can be checked with a meter as well. You can use resistance and
> watch if it gets higher smoothly as the throttle opens on 2 of the pins
> and watch it get lower on the other pin. (3 pin plug I think with one
> common) You can leave it plugged in with the key just 'on' but the
> engine off and check the voltage by backfeeding the plug. Same deal, 2
> pins will get higher and the other one with center will get lower. It
> needs to rise or lower smoothly ranging from 0.02V to 4.8V.
>
> Second I would be thinking fuel filter. It is on the frame rail back by
> the tank.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Davey wrote:
>>
>> 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
about 12000 km ago. I will reply with any news. Thanks guys.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:41BC5FFF.AE9571C4@sympatico.ca...
>I would first be suspecting a dirty connection on the TPS or a worn
> one.
> I would take off the TPS plug and clean it (the plug and socket) with a
> contact cleaner spray. WD40 will do in a pinch, but isn't the best.
>
> The TPS can be checked with a meter as well. You can use resistance and
> watch if it gets higher smoothly as the throttle opens on 2 of the pins
> and watch it get lower on the other pin. (3 pin plug I think with one
> common) You can leave it plugged in with the key just 'on' but the
> engine off and check the voltage by backfeeding the plug. Same deal, 2
> pins will get higher and the other one with center will get lower. It
> needs to rise or lower smoothly ranging from 0.02V to 4.8V.
>
> Second I would be thinking fuel filter. It is on the frame rail back by
> the tank.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Davey wrote:
>>
>> 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
#20
Guest
Posts: n/a
Re: 91' Cherokee, please somebody help me
Hah, seems like it's much better now. What I did? Just like you guys told me
(some of those things). First, I cleaned plugs for TPS and the other one (I
think it's for cold start, just nearby). Then, in meantime, tranny oil.
Transmission sump was very clean, even magnets were only little black. But
after oil change, Jeep runs more and more smoothly (?!) Is it possible that
something was wrong with oil? Maybe would be nice to "wash"one more time
with fresh oil just because some of old oil was still in converter?
"Davey" <dejvis.pale@du.t-com.hr> wrote in message
news:cpiim7$skl$1@ls219.htnet.hr...
> Hmm, I'm going to try some of those things. New fuel filter was installed
> about 12000 km ago. I will reply with any news. Thanks guys.
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:41BC5FFF.AE9571C4@sympatico.ca...
>>I would first be suspecting a dirty connection on the TPS or a worn
>> one.
>> I would take off the TPS plug and clean it (the plug and socket) with a
>> contact cleaner spray. WD40 will do in a pinch, but isn't the best.
>>
>> The TPS can be checked with a meter as well. You can use resistance and
>> watch if it gets higher smoothly as the throttle opens on 2 of the pins
>> and watch it get lower on the other pin. (3 pin plug I think with one
>> common) You can leave it plugged in with the key just 'on' but the
>> engine off and check the voltage by backfeeding the plug. Same deal, 2
>> pins will get higher and the other one with center will get lower. It
>> needs to rise or lower smoothly ranging from 0.02V to 4.8V.
>>
>> Second I would be thinking fuel filter. It is on the frame rail back by
>> the tank.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>>
>> Davey wrote:
>>>
>>> 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
>
>
(some of those things). First, I cleaned plugs for TPS and the other one (I
think it's for cold start, just nearby). Then, in meantime, tranny oil.
Transmission sump was very clean, even magnets were only little black. But
after oil change, Jeep runs more and more smoothly (?!) Is it possible that
something was wrong with oil? Maybe would be nice to "wash"one more time
with fresh oil just because some of old oil was still in converter?
"Davey" <dejvis.pale@du.t-com.hr> wrote in message
news:cpiim7$skl$1@ls219.htnet.hr...
> Hmm, I'm going to try some of those things. New fuel filter was installed
> about 12000 km ago. I will reply with any news. Thanks guys.
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:41BC5FFF.AE9571C4@sympatico.ca...
>>I would first be suspecting a dirty connection on the TPS or a worn
>> one.
>> I would take off the TPS plug and clean it (the plug and socket) with a
>> contact cleaner spray. WD40 will do in a pinch, but isn't the best.
>>
>> The TPS can be checked with a meter as well. You can use resistance and
>> watch if it gets higher smoothly as the throttle opens on 2 of the pins
>> and watch it get lower on the other pin. (3 pin plug I think with one
>> common) You can leave it plugged in with the key just 'on' but the
>> engine off and check the voltage by backfeeding the plug. Same deal, 2
>> pins will get higher and the other one with center will get lower. It
>> needs to rise or lower smoothly ranging from 0.02V to 4.8V.
>>
>> Second I would be thinking fuel filter. It is on the frame rail back by
>> the tank.
>>
>> Mike
>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>> 88 Cherokee 235 BFG AT's
>>
>> Davey wrote:
>>>
>>> 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
>
>