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Rythmic Banging (matches engine speed)

Discussion in 'Wrangler TJ (1996-2006)' started by ulkster, Oct 21, 2023.

  1. Oct 21, 2023 at 5:47 AM
    #1
    ulkster

    #1
    ulkster [OP] Member

    Joined:
    Oct 21, 2023
    Member:
    #8299
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2000 TJ Sport 4.0
    I live in San Diego (btw, anyone know of a good "Jeep whisperer" who'd be willing to just take a look/listen in person?), and when I drove back from Vegas last week (stopping a few times to give the engine a break) a concerning rattling/banging developed somewhere under the hood. It correlates with engine speed, so it's slower at idle and speeds up as you open the throttle (even in neutral).

    With a stethoscope, we noticed that it's louder from cylinder 2 and/or 3 & it accentuated on exhaust runners. There's no smoke, but I think I detected a faint smell in the vent when starting from cold. But it's loud on both sides of the head (driver & passenger), which seems odd?

    Our current hypothesis is one of three options (but please correct me if you have better ideas):
    1) exhaust manifold leak
    2) stuck valve
    3) rod knocking (hopefully not)

    I have a couple videos of the noise, but the files are too large to attach (even though they're short).

    How do those ideas sound? Any suggestions? And if anyone's especially familiar with TJ's and willing to swing by North Park/University Heights, I'm happy to offer a beer or two to just take a gander IRL.

    Thanks for your time
     
    ulkster, Oct 21, 2023
    #1
  2. Oct 21, 2023 at 6:49 AM
    #2
    ulkster

    #2
    ulkster [OP] Member

    Joined:
    Oct 21, 2023
    Member:
    #8299
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2000 TJ Sport 4.0
    Oh whoops, I forgot: 2000 TJ 4.0 manual
     
    ulkster, Oct 21, 2023
    #2
  3. Oct 22, 2023 at 12:28 PM
    #3
    ulkster

    #3
    ulkster [OP] Member

    Joined:
    Oct 21, 2023
    Member:
    #8299
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2000 TJ Sport 4.0
    OK, I just uploaded my videos to YouTube so you can hopefully see:
    First noise video

    Second video from inside.

    Check engine light scanner result:
    P0442
    Raw code: 0442
    ECU: D1
    Status: Confirmed
    Evaporative emission (EVAP) system - small leak detected

    ----------------------

    Tailpipe moisture- I also took a vid of what seems to be excessive moisture out the tailpipe when I first start her up.
     
    ulkster, Oct 22, 2023
    #3
  4. Mar 9, 2024 at 1:49 PM
    #4
    ulkster

    #4
    ulkster [OP] Member

    Joined:
    Oct 21, 2023
    Member:
    #8299
    Messages:
    7
    Gender:
    Male
    Vehicle:
    2000 TJ Sport 4.0
    It's been a while since I posted, but we were finally able to remove the oil pan (after "exhausting" work taking off enough bolts from exhaust pipe & lowering the skid plate enough for other stuff to wiggle the pan out then raising it back up to reconnect). And yup, definite piston scraps in the oil pan (just like people suggested & I saw in at least another video or two). Check it out:
     
    ulkster, Mar 9, 2024
    #4
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