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Split second rattle

Discussion in 'VE Holden Commodore (2006 - 2013)' started by HDJ, Sep 11, 2019.

  1. HDJ

    HDJ Member

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    basically I started my car today, after it sitting cold for about 8 hours and upon startup for a split second a rattling sort of noise occurred. Now my car does have an exhaust rattle when cold on idle it only has a slight rattle not as loud as the split second one that occurred. I tried Revving and turning it on and off but i can’t seem to make the sound again. Also my car rattles in first when cold for 3 secs. Could it be timing chains?
     
  2. losh1971

    losh1971 Well-Known Member

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    I'd say it's timing chains. Even though my engine is a Buick it, replacing the chain eliminated a cold start rattle and hot running rattle. Mine started out with a 3-4 second rattle upon starting, then eventually got bad when hot.
     
  3. HDJ

    HDJ Member

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    It’s going for a service on Friday so should be confirmed by then. Just a quick update it did it again after letting it sit cold again for 3 hours. It happens a second after it’s started and lasts for two blinks of an eye on idle only.
     
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  4. greenacc

    greenacc Searching for the billion

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    Sounds normal for Alloytecs. The question gets asked every week so it's very common. My car has made a very short rattle when started in the morning for the last 10 years and hasn't been a problem yet. Just make sure you change the oil regularly before it goes black.
     
  5. HDJ

    HDJ Member

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    My cars a sidi LFX 2012
     
  6. lmoengnr

    lmoengnr Well-Known Member

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    Probably just the hydraulic chain tensioners bleeding down.
     
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  7. HDJ

    HDJ Member

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    Well she’s never done this rattle before only started today.
     
  8. HDJ

    HDJ Member

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    This is exactly what it sounds like.
     
  9. greenacc

    greenacc Searching for the billion

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    Still normal. The oil pressure takes a few seconds to build up enough after starting to tension the chains fully.
    Actually there's a nasty crunchy sound just at the end. That's weird because on mine the slight chain noise happens instantly as it starts. Yours was quiet then got crunchy.
     
    Last edited: Sep 11, 2019
  10. HDJ

    HDJ Member

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    Well hopefully your right and nothing is actually wrong with the car as this only started happening today. Fingers crossed it’s not chains.

     
  11. EYY

    EYY Well-Known Member

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    That doesn't sound good... I'd be getting that fixed if it makes that loud ratcheting sound over the top of normal chain noise
     
  12. HDJ

    HDJ Member

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    Strangely enough this morning It didn’t happen.
    Nvm it just did it again
     
    Last edited: Sep 12, 2019

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