hudson12787

i have a 94 xj 4.0 automatic trans 4x4 i bought this heep 3 weeks ago with 161000 miles it was cheap and the knock was already present i thought it was something in the head but i took the vc of today and the pushrods look good its oiling good and the rockers are tight. with the vc on it sounds like its in the head with the vc off it the tick/knock sounds weak but not in the head. its coming from the back of the motor there was no sludge in the head pretty clean really. there s a slight miss in the motor also only knocks at idle and sometimes isnt present till it rund a minute or to what do u guys think

rweaver138

I dont have an answer for you, but I've owned three Jeeps (90, 01, 99) and they have all knocked.

hudson12787

then we're not the only ones my stepdads has a slight knock at idle his is a 98 everyone tells me just to drive it does your knocks sound similar to what i describe

Skunkape

Mine started knocking after a oil change once,turns out my XJ does not like Fram oil filters,replaced it with a Mopar filter and it went right away.this last time I used a K&N filter seems like it worked even better.Might be worth looking at,I dont mind a little ticking but a knock worries me.....JM 2cents

hudson12787

it had a fram when i bought it i just changed it with a purolator u guy think it could be a weak oil pump since its only at idle and it just dont pump enough oil

hudson12787

after u mentioned the filter i thought maybe a weak oil pump would cuz it to not pump to the head good at idle when i had the vc off it was pumping to the head but there wasnt a drop splattered outside the head with it runnin

myredxj

I had a slight knock a couple years ago. And it ended up being that all the converter bolts were loose. I pulled them out one by one and put lock tight on them.

mwdouglas

sounds like a weak oil pump to me even at idle you should have oil splatter everywhere with the vc off you can try to do an engine flush and see if that helps what is your oil pressure gauge at at idle

hudson12787

i ran motor flush for 25 minutes then changed oil i put 5 qts of castrol gtx and a qt of tranny fluid ''trany fluid because i read somewere u can sub a qt of oil with trany to clean a engine and run 500 miles then change again'' im willin to try anything. my oil gauge is bad stays pegged past 80 jeep off or running. can u change oil pump in a jeep in with engine in also to check flywheel bolts all i gotta do it remove lower dust cover correct

mwdouglas

yea like i said before sounds like a bad pump or it could be a clogged inlet filter for the oil pump

hudson12787

can you change the pump with the motor in the vehicle on a jeep
and to check convertor bolts you just remove lower dust cover correct

mwdouglas

yes and yes

hudson12787

thanks boss man you been i big help to me on here it seems like you are the person answering all my questions ill check it out nxt time im at the shop and let you know what i find you wouldnt happen to know vc torque specs would you

mwdouglas

not off the top of my head but give me a min and i can find them for ya

mwdouglas

valve cover torque spec is 85 in lbs or in shade tree trems tighten with fingers then give a little snug with a socket and wrench