motor problems-----help needed

[fluidmotion]

ok so randomly on acceleration my motor will bog down like it is out of gas but it does it no matter how full the tank is. but thats not all, when i take a right turn semi hard the motor will bog down and toally die. so what is causing this? anyone?

[vwkaferman]

Fuel injected? Carb'd?

If carbureuted, possibly float bowl going dry, maybe rebuild? Sounds more like a fuel pump/ fuel filter issue.

James

[fluidmotion]

its a 92 4.0L XJ its fuel injected, sorry i should of mentioned that

[Dr. Dyno]

........my motor will bog down like it is out of gas....

That's probably because the motor really isn't getting any gas because the fuel pump's on the way out.

[fluidmotion]

That's probably because the motor really isn't getting any gas because the fuel pump's on the way out.

well take tonight and the rest of my driving with it though. it drives 100% normal.

[Dr. Dyno]

Don't you just love those hard to diagnose intermittent faults?
When the engine dies, do all the electrics die with it or do they still remain operational?

[fluidmotion]

everything remains operational

[Eagle]

Check the routing and condition of the wire from the CPS. If it's loose, it could be intermittantly shorting against the exhaust manifold.

[fluidmotion]

Check the routing and condition of the wire from the CPS. If it's loose, it could be intermittantly shorting against the exhaust manifold.

nope thats fine, i check it today

[Dr. Dyno]

It's possible that the CPS itself is kaput so you should think about replacing it especially if it's the original one from '92. I also have a '92 XJ and my old CPS died two years ago at about 160k miles. That's a lot longer than most of them last.

[fluidmotion]

afaik it is the original CPS. when i changed the fuel filter yesturday it was pretty clogged. i could turn it one way and dump out all the gas and then turn it over and dump out more. im also gonna replace the cap and rotor but im going to hold off on everything else now because it has yet to act up again. so its hard to tell if there is something wrong now.

[Dr. Dyno]

I would change the CPS anyway. Mine started acting up in November 2002 and initially I didn't think the CPS was the problem because the engine only cut out twice in a short time and then it didn't do it again for six months. I was starting to think it was the fuel pump. By May 2003 the engine started cutting out again at random and it progressively got worse over the next month or so until I could hardly drive 1/2 a mile without the engine dying, and then it would take a while before it would start again.
Replace the CPS, otherwise you might be tearing your hair out later on if the engine dies on you in the middle of nowhere and you're left stranded.

[fluidmotion]

do you happen to know an estimate on price or even a part number?

[Dr. Dyno]

Yeah, the CPS part no. is 4638128 and you can get it for $38.50 from http://www.tapcointernational.com/store/shopdisplayproducts.asp?id=15&subcat=226&cat=ENGINE++SPEED++SENSOR
You can also get it from the stealership but they'll probably charge more.

[fluidmotion]

Yeah, the CPS part no. is 4638128 and you can get it for $38.50 from http://www.tapcointernational.com/store/shopdisplayproducts.asp?id=15&subcat=226&cat=ENGINE++SPEED++SENSOR
You can also get it from the stealership but they'll probably charge more.

out of curiosity, why does that site list them as engine speed sensors?

[Dr. Dyno]

Good question. I can only guess that the CPS is where the tach gets its rpm signal from in OBD I models.

[fluidmotion]

that would make sense but then wouldnt my tach be on the friz and not my motor boggin down. oh and it came back tonight so its the pump or something else doing it.

[xuv-this]

check the voltage on the throttle position sensor. if it reads less than 4.5 volts or so at WOT, that could be it. my 95' did this wierd thing where it was acting like the electrical connector was loose, but it turned out that something was loose inside the sensor, and at WOT it would read anywhere from .5-3.5 volts.

[fluidmotion]

check the voltage on the throttle position sensor. if it reads less than 4.5 volts or so at WOT, that could be it. my 95' did this wierd thing where it was acting like the electrical connector was loose, but it turned out that something was loose inside the sensor, and at WOT it would read anywhere from .5-3.5 volts.

not to knock what you said but why would that cause the problem when im turning and not even on the gas.

[ewhood]

I experienced a similar problem and found that my muffler was beggining to stop up.

[fluidmotion]

I experienced a similar problem and found that my muffler was beggining to stop up.

well i just got my whole exhaust done about 2 months ago so i know thats not the problem

[8Mud]

Just a shot in the dark, but on another site there was a rash of pump problems in the 95-96 (I think or maybe it was 96-97) year XJ´s, turned out to be the pick up line for the pump rotting, when the tank got below a certain level the pick up sucked some air. Have heard of a few guys with earlier models, have chunks of rubber in the filter along with the normal junk.
I haven´t had the pump out of any late model XJ´s, so I can´t say for sure if it´s possible to have a hole in the pick up line or not, but maybe something to think about.

[fluidmotion]

Just a shot in the dark, but on another site there was a rash of pump problems in the 95-96 (I think or maybe it was 96-97) year XJ´s, turned out to be the pick up line for the pump rotting, when the tank got below a certain level the pick up sucked some air. Have heard of a few guys with earlier models, have chunks of rubber in the filter along with the normal junk.
I haven´t had the pump out of any late model XJ´s, so I can´t say for sure if it´s possible to have a hole in the pick up line or not, but maybe something to think about.

well ive been thinking that there is something wrong with my pump. when i changed the filter i didnt get any chunks of anything coming out but the filter was clogged. i think pretty soon im just going to have to replace it.

[John(XJ)Jeep]

I had the same problem for a while too, just after I put plates on and such. It liked to bog under acceleration and on turns. Funny though that all I had to do is drive it for a while and it cleared up on its own.

But from that experience I'm guessing it has to be the fuel filter/pump. I can't see anything else that can be the case because the problem becomes aggrevated from driver input.

If its carburated then yeah, the fuel is not reaching the bowls.

[xuv-this]

not to knock what you said but why would that cause the problem when im turning and not even on the gas.
i don't know why, except that something was loose inside. i had to wiggle or tap the connector end sometimes to start. i replaced the connector, no change. i replaced the sensor, no more coaxing it into starting, or trying to cut off while driving. yeah, i couldn't understand it either....

[fluidmotion]

i don't know why, except that something was loose inside. i had to wiggle or tap the connector end sometimes to start. i replaced the connector, no change. i replaced the sensor, no more coaxing it into starting, or trying to cut off while driving. yeah, i couldn't understand it either....

well i will check into it then. it just doesnt make sense why it would do it on turns as well. it fires up every time too.

oh and John(XJ)Jeep, my jeep is fuel injected

[Dr. Dyno]

It seems you still haven't changed your CPS yet. I don't know what you're waiting for. Even if I'm wrong, you will have at least eliminated that as a cause of your problem. It's 13 years old so it'll be near the end of its life anyway and if I'm right, it's already got one foot in the grave.

[fluidmotion]

oh i plan on changing it, i just havent had time lately.

[xuv-this]

i got a new cps too, to troubleshoot my problem. changing it didn't do anything, but i keep it onboard with my toolkit all the time, just in case. i would consider it $85 well spent.

[fluidmotion]

i got a new cps too, to troubleshoot my problem. changing it didn't do anything, but i keep it onboard with my toolkit all the time, just in case. i would consider it $85 well spent.

well in that case i dont have the money for it right now either. damn it i need a job

[xuv-this]

i think the tps is about $35. eventually it's gonna need one of those, too.....

[Dr. Dyno]

well in that case i dont have the money for it right now either. damn it i need a job

I already told you where you can get a CPS for $38.50. Have you forgotten already? That's a whole lot better than $85.

[fluidmotion]

oh i know, but im prolly gonna do the CPS, TPS, O2 sensor (because its on the fritz) and fuel pump all in one because they are all stock and havent been changed. so i need some money for all that.