Question about 2005 Cadillac CTS

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Rattle from timing chain/cam advance when starting and under load

Rattle/knock

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Hello sir,

There are three possible reasons why your timing chain is making the rattling noise.
1. Oil pressure is low: The tensioners that keep the timing chain tight are operated by oil pressure so if your oil pressure is low then the tensioner will not be working properly hence your chain will flap around and hit the guides.
2. Tensioner is stuck: If you have alot of oil gunk on your tensioner then the tensioner will be stuck and not extend out all the way to keep the timing chain tight.
3. Tensioner is broken: If your tensioner is mechanically broken then you need to replace it.
Having said that, before you follow this write-up it is a good idea to check your oil pressure. Also, in this write up I will not go over how to replace the tensioner but rather tell you how to clean it while it's still installed.

Posted on Jun 11, 2008

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Time for the servicing and reparing person to check.

Posted on Jun 11, 2008

  • hemant somaiya
    hemant somaiya Jun 11, 2008

    it is definitely some minute but internal problem.so do not try to do it your self if something goes wrong it will cost u more than this and also waste your time.if u think this solution has saved your time and helped you any way rate this as fixya to encourage us to solve more and more problem like yours.good luck my dear friend. thank u for using fixya.

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