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  1. #1

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    Jeep 4.0l stuck lifter help

    I have an 02 wrangler with the 4.0L motor. It has a little less than 90,000 miles and what I believe to be a stuck lifter. There is a loud tick in the morning that lasts till the motor is warmed up 5 mintues, sometimes more or less or sometimes it wont even do it. After it is warmed up it pretty much goes away. I can brely here it atleast if any. Does anone have any idea how much it costs to fix or if there are any other solutions. To the problem. Thanks

  2. #2

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    Are you sure it's not an exhaust leak? That sounds more like your problem. The manifolds crack and leak badly when cold, then seal up after a few minutes.

  3. #3

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    Im not positive. What is the easiest way to fix it if its the manifold?

  4. #4
    Mark's Avatar
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    Replace it.

  5. #5
    MIKE n IKE's Avatar
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    Mine does that too, I shut it off immediately and re-start..........noise gone! I think the top-end is starved for oil when started cold like that. It is a common problem with the 4.0 liter. You get used to it. What type of oil are you using? Mine started after switching to a synthetic blend.
    '04 TJ Sport, 3.5 TeraFlex, SYE, LSD, 32's
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  6. #6
    MIKE n IKE's Avatar
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    Quick way to check ......If its the exhaust, the noise won't go away after a quick re-start, rather it will keep clicking until the engine gets warmed up a bit.

  7. #7
    Banned Leon Phelps's Avatar
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    Lifter noise is fairly common on a 4.0. Try some Marvel Mystery Oil.

  8. #8

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    I have tried everything from a bg quick clean before the oil change to an engine flush. Right now I am running mobile quick clean 5000 10w30 with a lucas additive. I have tried the bg additive too but I thought it didnt work as well so I stuck with lucas. I have never tried the restart thing. I wil try it omorrow morning and let you know. I work at a shop too by the way and everyone seems to have a different opinion. one person has heared it only for a few seconds and htought it was the lifter. One mechanic said to try synthetic oil but I do not want to start and oil leak.

  9. #9

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    Also with the marvel mystery oil do you put it in before you change the oil? I have never used the stuff. I have heared of people driving with it for a few hundred miles before an oil change. Is that okay to do?

  10. #10
    Bring it here Evergreen lets take a look possably just needs an ajustment
    >>>>>>YOU TALKIN TO ME <<<<<<[CENTER][SIGPIC][/SIGPIC][/CENTER]

  11. #11
    I've always put a pint in with oil change helps save the valves on older motors also helps if you burn alot of oil ,granddad tought me that trick

  12. #12

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    What are you going to adjust on a 4.0's non-adjustable valvetrain?

  13. #13
    Digger's Avatar
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    Quote Originally Posted by 4.0Cherokee View Post
    Bring it here Evergreen lets take a look possably just needs an ajustment
    umm...

    Quote Originally Posted by Norco View Post
    What are you going to adjust on a 4.0's non-adjustable valvetrain?
    yeah... what Norco said...

  14. #14

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    Mine does that too, I shut it off immediately and re-start..........noise gone! I think the top-end is starved for oil when started cold like that. It is a common problem with the 4.0 liter. You get used to it. What type of oil are you using? Mine started after switching to a synthetic blend.
    I tried that this morning and it worked. it cam back after about a minute though but wasnt very loud.

  15. #15
    Quote Originally Posted by Norco View Post
    What are you going to adjust on a 4.0's non-adjustable valvetrain?
    typed that to fast with out thinking about what engine it was my bust

  16. #16
    Digger's Avatar
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    Quote Originally Posted by ENHRider14 View Post
    I tried that this morning and it worked. it cam back after about a minute though but wasnt very loud.
    time for a set of lifters.

  17. #17
    Quote Originally Posted by ENHRider14 View Post
    Right now I am running mobile quick clean 5000 10w30 with a lucas additive.
    Have you tried a thinner oil (like 5W-30)? Does it make the noise in warm weather or only when it's cold?

    I'd try a different oil. I used to have an old Montero and when I used some cheap-ass oil it started to tick badly. Switched to a better oil and the problem went away. (It's the only time I've ever noticed any difference in switching from one oil to another).
    Last edited by Jim B; February 3rd, 2009 at 05:04 PM.

  18. #18
    Quote Originally Posted by Digger View Post
    time for a set of lifters.
    He'd probably have to replace the cam along with the lifters, correct?

  19. #19

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    Only if the lobes are flattened. Old cams can use new lifters but it's considered extreme duty break in all over again. New cam old lifters, old cam old lifters on different lobes = carnage

  20. #20
    clemsonkrawler's Avatar
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    Saul?!?! That you?
    Pimpin aint easy.

  21. #21
    Quote Originally Posted by clemsonkrawler View Post
    Saul?!?! That you?
    NO! I read FrankZ's story of cam/lifter issues
    "When Murphy wrote his law he was thinking of YOU" - JRVYota
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  22. #22
    MIKE n IKE's Avatar
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    Quote Originally Posted by ENHRider14 View Post
    I tried that this morning and it worked. it cam back after about a minute though but wasnt very loud.
    Same thing here, I don't think its a problem though, still runs like a champ. I put some serious miles on mine and it hasn't gotten worse. If it wasn't making some crazy noise it wouldn't be a jeep!

  23. #23

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    Right now I am running 10w30 oild with lucas oil stabalizer. I am doing an oil change this week and am going to try 5w30 and see if it helps. Its does it more when cold.

  24. #24
    MIKE n IKE's Avatar
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    Yeah, in the summer its almost non-existent unless I'm in the mountains camping where its cold at night. I wonder if the oil galleys are too small or if the pump is just kinda weak in these motors?

  25. #25
    Digger's Avatar
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    no... they just have occasional lifter bleed down problems.

  26. #26

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    Once again I tried the shut if back off and restart it and it works miracles. It makes it quite enough to not be annoying when it is warming up. Thanks

  27. #27

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    Could be piston slap but unlikely. Probably exhaust manifold (or its gasket) or lifter, potentially a broken valve spring. Try 5w30 synthetic oil with no additives. Synthetic oils have great detergent properties.

    You could also ask on bobistheoilguy.com forums if it's really bugging you. That group is full of tribologists and some dude over there sells a engine oil additive that really does clean stuff out, but slowly so you're not plugging oil galleys and such.

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