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Old 09-10-2012, 06:52 AM   #1
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Default 4.0 knock

metal on metal sound when accelerating usually going uphill btween 2000rpm and 3000rpm coming from engine bay sounds like a sticky lifter or valve or maybe a misfire on one of the cylinders jw if anyone has had this same problem and wat was it you had to fix
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Old 09-10-2012, 06:59 AM   #2
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Quote:
Originally Posted by tvarney26
metal on metal sound when accelerating usually going uphill btween 2000rpm and 3000rpm coming from engine bay sounds like a sticky lifter or valve or maybe a misfire on one of the cylinders jw if anyone has had this same problem and wat was it you had to fix
If it is a lifter, or rod knock, I think it would be different than a misfire. If theres a misfire it's gonna effect the performance of the jeep and cause some amount of power loss, or at least a slight hesitation of some kind. Could it be the flex plate is loose? Have you changed the oil or done and maintenance work recently?
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Old 09-10-2012, 07:18 AM   #3
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yeah i just change the oil not too long ago with rotella 15w 40 and everything is fine till i jump down a gear uphill and then it starts to really tick when going from 1750rpm up to about 2500 then it shifts up and shuts up when it goes back down to about 1500rpm
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Old 09-10-2012, 07:18 AM   #4
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ONLY under a load? Not valve train related.

Auto trans? Check the flexplate bolts first and foremost as already suggested.
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Old 09-10-2012, 07:20 AM   #5
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i just put some seafoam in yesterday too to see if i could lossen up my lifters a bit but it has been hapening way before my oil change or seafoam
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Old 09-10-2012, 07:21 AM   #6
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ONLY under a load? Not valve train related.

Auto trans? Check the flexplate bolts first and foremost as already suggested.
it ticks like any older 4.0 at idle but gets loudest at those rpms
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Old 09-10-2012, 07:21 AM   #7
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auto trans
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Old 09-10-2012, 07:22 AM   #8
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Quote:
Originally Posted by cruiser54
ONLY under a load? Not valve train related.

Auto trans? Check the flexplate bolts first and foremost as already suggested.
I hope it's that..
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99, AW4, 242, 235 DuraTracs, a couple inches of lift, some ghetto fender flares to keep the fuzz happy and after months of procrastinating, a front DS again..

Lack of planning on your part does not constitute an emergency on my part...

Chances are I just gave you my two Lincolns. Take it or leave it.
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Old 09-10-2012, 07:23 AM   #9
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auto trans
it also seems to be worse on hot days and doesn't happen when i start it up and go to work in the a.m.
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Old 09-10-2012, 07:25 AM   #10
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it also seems to be worse on hot days and doesn't happen when i start it up and go to work in the a.m.
i can push her through 1st and 2nd up to 3000 in a.m with no knock but in the afternoon after its been sittin in the sun all day it will tick goin uphill if i jump down a gear and try to push her through 2500-3000
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Old 09-10-2012, 07:27 AM   #11
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i can push her through 1st and 2nd up to 3000 in a.m with no knock but in the afternoon after its been sittin in the sun all day it will tick goin uphill if i jump down a gear and try to push her through 2500-3000
idon't know if i should get new plugs cuz if i try to go in that higher gear up the hill instead of jumping down one it will die in rpms and allmost hesitate
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Old 09-10-2012, 07:32 AM   #12
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I hope it's that..
could it be from my squeaking serpentine belt no getting the right power to the pulleys
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Old 09-10-2012, 07:57 AM   #13
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Well. It sounds like theres a couple things to check. First, yeah, get the squealing to stop. Load test your alt and battery, if ya want, but also, the evap canister makes a tick noise and it seems like it might do it more after things have heated up.. Check your sensors like TPS, IAC, o2's.. A decent mechanic with a good diagnostics computer can tell you if theres something up with sensor voltage, compression..
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99, AW4, 242, 235 DuraTracs, a couple inches of lift, some ghetto fender flares to keep the fuzz happy and after months of procrastinating, a front DS again..

Lack of planning on your part does not constitute an emergency on my part...

Chances are I just gave you my two Lincolns. Take it or leave it.
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Old 09-10-2012, 08:04 AM   #14
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http://www.cherokeeforum.com/f51/how...ocking-125547/
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An index to over 25 helpful write-ups is in Post #1.


http://www.cherokeeforum.com/f51/cruiser54s-mostly-renix-tips-153657/

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Old 10-15-2012, 04:18 AM   #15
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Default How did seaform work for the potiential sticky lifter?

Curious...
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Old 10-15-2012, 04:18 AM
 
 
 
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