Engine 2003 Mustang Gt 4.6 - Knocking/rattling Noise @ Startup & Higher Rpms

Discussion in 'SN95 4.6L Mustang Tech' started by Quick03GT, Jun 7, 2014.


  1. Quick03GT

    Quick03GT New Member

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    ok here is the issue, in the mornings or when i let the car sit for awhile i go out to start the car up it makes a loud knocking noise then goes away, but when you raise the engine rpm up to about 1,500/2000 rpm the knocking get's louder sounds like it coming from the passenger side of the car.

    I have already replaced the timing chain guides, tensioners, etc.
    I have already unplugged each injector the noise does not change or go away
    It sounds like its coming from the front of the car right by the timing chain cover and the valve cover.

    This noise happened out of no where going home from work and started making a noise, sounded like it was low on oil but that was not the issue.


    The car is not blown or has any kind of power adder of the sort. it's pretty much a stock engine with about 180,000 miles..

    any kind of help or what to look for would be appreciated!
    thank you in advance..

    p.s. if a video would help please let me know
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  2. Quick03GT

    Quick03GT New Member

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    here is the video of the noise..

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  3. jka

    jka Member

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    It sounds like the timing chain and guides/ tensioner.
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  4. Noobz347

    Noobz347 Stangnet Facilities Maint Tech... Er... Janitor Admin Dude

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    Moved your thread over to the SN95 Tech forum. You stand a much better chance of getting a response here.
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  5. trombonedemon

    trombonedemon Well-Known Member

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    Rod bearing, you can check those by removing the oil pan, but the engine needs to be supported and engine mounts removed.
    Last edited: Jul 28, 2014 at 7:01 PM
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  6. 1987stangman

    1987stangman Member

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    How does the engine run as a whole? Could be a rod bearing, or it could be a lash adjuster or the chains. Your post says you have redone all that though.

    If it was me I would get a mechanical oil pressure guage and hook it up to see what the physical oil pressure was. The stock guage is not much help as the oil pressure could be low it would still read normal. That would help you determine if you possibly spun a bearing. If the oil pressure is good i would pull the cam covers and the front cover and inspect.
    #6

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