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  1. #1
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    Default Engine noise please help!!

    1995 jeep cherokee 4.oi6cyl. 75k on odom.


    Hello all, as always this is where i get all my help for my xj!
    My problem is my engine just started making this weird noise mostly under load. Ok so in park in doesnt make any noise unless i rev it higher than 2500rpms.. Now in drive it makes noise at 800rpms and up! Its not ticking or any other "normal" jeep noise.. I will describe it like this... When you hear the noise it sounds like a plastic bag is dragging fluttering around. Trust me there is no bag underneath. I hear it more so on the passenger side from somewhere lower than heads towaqrds the back of engine.the only time ive heard a noise similar to this was on my wifes honda when it was underload it was pinging from bad adjusted dizzy.. This jeep does not have a adjustable dizzy. Ok last thing.. I lost my job a couple months ago so my jeeps been parked for about 2 1/2 months but i warmed it up every week or so.. This last time i didnt get to start it up to warm it up because i waited a bit to long so it died..this morning i jump started it and the noise was very lightly there. As it warmed a bit the light noise went away but still did it under load in drive or high rpms in park. Before i parked it, it was great at all rpms underload or not.. Your help is appreciated.. Thanks!

  2. #2
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    Default Re: Engine noise please help!!

    Didn't we just have a fluttering bag thread recently. Never did hear what the solution was
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
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    Default Re: Engine noise please help!!

    Not sure.... But would like to hear some opinions please...

  4. #4
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    Default Re: Engine noise please help!!

    Sounds like it could be a cracked flex plate.
    Easy enough to tell.... Just pull back the inspection cover,
    ...and look in there with a good flash light while a friend bumps the starter to get it to rotate around every now and again.
    You'll be looking for cracks around the mounting points.
    Here's a decent video of the process: [ame]https://youtu.be/k21NSEm96H8[/ame]

    good luck, hope this helps with the process of elimination.
    5" lift, 33's. Armored, Lighted, Chipped, & Locked up Front. Soon to come: winch, gears, axle shafts, and more...
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  5. #5
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    Default Re: Engine noise please help!!

    Would this happen from it just being parked though??

  6. #6
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    Default Re: Engine noise please help!!

    I checked the flex plate a few weeks ago for another reason but i can definetly double check it again.. Any other ideas? Also im trying to get a video but when i raise the rpms it gets loud so let me see what i can get..

  7. #7
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    Default Re: Engine noise please help!!

    When you checked the flexplate, does that mean you checked the torque converter bolts to the flexplate.

  8. #8
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    Default Re: Engine noise please help!!

    I checked the plate for cracks and bolt tightness..

  9. #9
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    Default Re: Engine noise please help!!

    If you take a plastic bag and waved it in the air real fast that's exactly what it sounds like! Park and neutral u have to rev it high to hear.. under load u can hear it almost as soon as u apply gas..

  10. #10
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    Default Re: Engine noise please help!!

    I think your catalytic converter is coming apart inside
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  11. #11
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    Default Re: Engine noise please help!!

    My cat is brand new.. about 3 months ago I got it. And I hear the noise with the hood up on passengers side somewhere towards the back of the valve cover but on the lower part of engine. It's drove perfectly fine. I parked it for a couple months bit I made sure to start it once a week.. battery died I got it jumped took it for a drive to charge battery and that's when it started happening.

  12. #12
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    Default Re: Engine noise please help!!

    I just got in from out of town bit tomorrow morning I will get a video so maybe it will help figure it out.

  13. #13
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    Default Re: Engine noise please help!!

    I would say the exhaust but that's on the other side. The only thing I can think of besides flexplate is maybe the starter bolts are loose.

  14. #14
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    Default Re: Engine noise please help!!

    When It was dead and I first tried to start it, it did make a funny noise when it engaged. I thought it made that noise because of the dead battery. Maybe the starter solenoid is not retracting. Hmm let me look closer at it.. thanks for helping guys..
    Last edited by rm2406; 08-03-2015 at 10:47 AM.

  15. #15
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    Default Re: Engine noise please help!!

    Update.... fortunately it was embarrassingly simple... right before the battery died I changed the fan clutch. Apparently the bottom of the shroud split apart and with the heavy duty fan clutch it was sucking the shroud towards the blades making that noise.. the more I applied gas the more it brought the broken shroud in towards the blades the louder it got!..... thanks for the tech support guys!..

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