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strange noise from FJ40

Discussion in '40- & 55-Series Tech' started by bushwacker, Aug 2, 2005.

  1. bushwacker

    bushwacker

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    Mabey some of you guys can tell me what is causing a stange noise in my FJ4O. It sounds like a coffee purculator , and it only happens when I'm decelerating. other than the noise it runs fine. I have a chevy 305 and a th350 automatic tranny in it.
     
  2. Juice

    Juice

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    whereabouts does it sound like it is coming from? Might be differential gears. Does it make any noise when accelerating?
     
  3. 76BigheadFJ40

    76BigheadFJ40

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    whats a coffee thingy sound like? Grinding? Whirring?
     
  4. bushwacker

    bushwacker

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    strange noise

    It sounds like its coming from the front half of vehicle, mabey the tranny, transfer case, motor, or someplace else. It almost sounds like a gurgling sound that a coffee perculator makes, but only on deceleration, not when its idling or when I'm accelerating...weird.
     
  5. DSRTRDR

    DSRTRDR I can mangle anything ... SILVER Star

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    driveshaft vibrations?
     
  6. Cdaniel

    Cdaniel Undocumented Mechanic-Not CDAN SILVER Star

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    Exhaust leaks? :confused:
     
  7. Trollhole

    Trollhole THC Supporting Vendor Moderator

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    My guess also.
     
  8. dfmorse

    dfmorse

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    [It sounds like a coffee purculator]



    That sounds like my 73-FJ40 when it was new. Probably the smog pump...
    dfm
     
  9. fussy_cruiser

    fussy_cruiser

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    Could be the fan rubbing ever so slightly on the radiator or fan shroud, mine does this, been thinking about a solution.
     
  10. elblat

    elblat

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    Could also be minor backfiring
     
  11. camcruiser13

    camcruiser13

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  12. Paul_A

    Paul_A

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    Air leak in exhaust.
     
  13. muddy12

    muddy12

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    Check your spring U-Bolts - especially if you've changed springs recently. Mine had settled & allowed a bit of slop, letting the axle twist so the pinion to driveshaft alignment changed - better alignment under acceleration, worse under deceleration - causing the universal to complain. Also accompanied by a noticeable "CLUNK" when going on or off the throttle.
     
  14. bushwacker

    bushwacker

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    I will check those things

    I'll check those things you guys mentioned,exhaust leaks, coolant, one thing I've never tghought of is minor backfiring. Its a hard noise to track down because the only time it does it is when I'm driving and decelerating. I thought it might be the chain in the transfer case, but I'm not sure. Thanks for the replies
     
  15. poldo

    poldo

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    Please let us know if you find the problem , I have a similar noise
    sounds almost like a belt noise while running (but it isn't)
    then when the engine stops with the key off
    it sound like a tea kettle for a few secons :) almost like it buids steam and releses it when stopped
     
  16. PUPTLAM

    PUPTLAM

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    Are you sure its not exhaust back pressure?
    My 2 cents would agree with exhaust leak or coolant system, but when i decelerate I love the gurgling noise my exhaust makes.
     
  17. bustanutley

    bustanutley

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    There is no chain in your transfer case
     
  18. PabloCruise

    PabloCruise SILVER Star

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    My guess...
     
  19. Pin_Head

    Pin_Head

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    It is detonation of air/unburned fuel in the hot exhaust manifold. This is one of the things that the "smog control" system controls and eliminates.