Thread: help

  1. help

    i need help diagnosing this knock in a 2005 tj 4.0 liter in line 6 cyliinder
    im guessing its a sticky lifter or valve
    let me know what you think
    http://<iframe class="restrain" titl...="0"></iframe>

  2. #2
    Join Date
    Feb 2009
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    help

    That is loud.
    It could be a lifter or a loose rocker.
    Is the CEL light on? Do you know how to pull codes with the key dance?

    Did you do anything prior to this issue?

    Also it could be timing knock. The OPDA oil pump drive assembly and CAM gear wear. Some call it screaming monkeys.
    OPDA is to the right of the oil filter when standing on the passenger side.

    Here is the link that works


    Never look down on anyone unless you are helping them up - Jesse Jackson
    Last edited by JPNinPA; 03-30-2021 at 10:59 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3
    Join Date
    Feb 2009
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    help

    OPDA tick from another jeep


    What you will see
    help-image1617159913.113291.jpg


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  4. #4

    Re: help

    no trouble codes i recently changed the water pump and thermostat and put in a new pcm and new spark plugs. none of those things could cause knocking

  5. #5

    Re: help

    no trouble codes i recently changed the water pump and thermostat and put in a new pcm and new spark plugs. none of those things could cause knocking
    im not getting the "screaming monkey" effect. its very clearly a knock that matches the rpms so im thinking its not the OPDA and is more likely lifters, valves or rods

  6. #6
    Join Date
    Feb 2009
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    help

    Plugs and/ or a PCM can cause knocking. By fowling or timing.


    And the OPDA will match the RPM . Its driven off of the CAM.

    Its Your vehicle.... but an easy check for OPDA could be accomplished by: you could clock the engine to TDC on #1 and either see if the locking pin holes line up on the OPDA housing to the timing ring and or lock them and pull the OPDA and inspect the gears.

    Screaming monkeys do not always occur. I threw a code snd rough idle when i changed mine at 90K. At 60K it didnt look bad to consider change.




    Never look down on anyone unless you are helping them up - Jesse Jackson
    Last edited by JPNinPA; 03-31-2021 at 10:44 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  7. #7

    Re: help

    Quote Originally Posted by JPNinPA View Post
    Plugs and/ or a PCM can cause knocking. By fowling or timing.


    And the OPDA will match the RPM . Its driven off of the CAM.

    Its Your vehicle.... but an easy check for OPDA could be accomplished by: you could clock the engine to TDC on #1 and either see if the locking pin holes line up on the OPDA housing to the timing ring and or lock them and pull the OPDA and inspect the gears.

    Screaming monkeys do not always occur. I threw a code snd rough idle when i changed mine at 90K. At 60K it didnt look bad to consider change.




    Never look down on anyone unless you are helping them up - Jesse Jackson

    I did what you suggested and it quieted down the knock a lot. it seems i need a new opda to get rid of it completely. Thanks for the help.

  8. #8
    Join Date
    Feb 2009
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    5,870

    help

    Glad it helped. Get it replaced before too much wear on the CAM

    I replaced mine with dorman brand. So far so good.


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

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