Newbe 94xj jerk hesitation Please Help

[SubaruUpgrade]

Hi everyone.
Hope I can draw from your experiance.

I recenty got a 94 xj country 4.0 HO

all in all, the jeep is in very good shape.

there is one problem that scares me.

The real problem is a sharp repeating "jerk" or "stop-bump" or "hesitation"
when coming to a stop at a light , or coasting at a crawl and also while stoped with it in "drive".
It is constant, from the moment i start it and while sitting in traffic and till the time i shut it off at the end of the day, reguardless of engine temp.
There is also very slight idle hesitation when in neutral.

The scary part is , it is getting worse,. Not sure if it is weather related or it the problem is just worsening on its own.

I do know that the XJ has a 160 degree thermastat.

Does anyone have any experiance with this problem?

Thanks

[xjkevin]

?

maybe check your control arm bushings,or motor mounts, do you feel anything in your steeringwheel? how does it run./// Kevin

Hi everyone.
Hope I can draw from your experiance.

I recenty got a 94 xj country 4.0 HO

all in all, the jeep is in very good shape.

there is one problem that scares me.

The real problem is a sharp repeating "jerk" or "stop-bump" or "hesitation"
when coming to a stop at a light , or coasting at a crawl and also while stoped with it in "drive".
It is constant, from the moment i start it and while sitting in traffic and till the time i shut it off at the end of the day, reguardless of engine temp.
There is also very slight idle hesitation when in neutral.

The scary part is , it is getting worse,. Not sure if it is weather related or it the problem is just worsening on its own.

I do know that the XJ has a 160 degree thermastat.

Does anyone have any experiance with this problem?

Thanks

[SubaruUpgrade]

sems to be more of a engine problem,
there is a definate loss of power jolt.

I am woundering if maybe the O2 sencer is messed up

[Imbeamer]

fuel filter or O2 sensor would be the things I would check\change. From your description, it could be any number of things but those 2 are pretty easy to change out, then go from there.

[SubaruUpgrade]

Thanks for the advice.

today i cleaned the Throttlebody it was so bad i had to take it off to clean it.
Also I baught a 195 therostat .

I am going to check the distributor and pugs today.

tomarrow the Fuel filter and O2

thanks again

[SubaruUpgrade]

Update:

replaced plugs,distributer and rotor cap*.>>> Major improvement ! much smoother idle.

relaced fuel filter >> even more of an improvement!!
Running very smooth now!

*Had to exchange the cap for a higher quality one because
i noticed an imperfection in the new Auto-Zone cap befor i even got out of the store with it!

[SubaruUpgrade]

PEICE OF AUTO-ZONE ****. FILTER LEAKING!!!!!!!:mad:
Had to dig the old filter with 157,000 miles on it, back out of the garbbage can and reinstall it!

Can notice idle differance. going to have to buy a quality filter from somewhere.

Man! How hard is it to make a simple product with quality ?

NEVER buying nessasary parts from Auto-Zone again!

[jeeper89]

try napa.. they usually have pretty good parts.

[SubaruUpgrade]

Thank you for all your input and help