2005 STS loud engine grind/rattle on start up only
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  • 2 Post By dkozloski
Cadillac Customer Care Representatives - Warranty or Dealership problems Discussion, 2005 STS loud engine grind/rattle on start up only in Cadillac Customer Care - Warranty and Dealership questions; I have a 2005 STS loud grind/rattle when I start my car, however, it is intermittent. It lasts only a ...
  1. #1
    workmant is offline Cadillac Owners Member
    Automobile(s): 2005 STS
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    2005 STS loud engine grind/rattle on start up only

    I have a 2005 STS loud grind/rattle when I start my car, however, it is intermittent. It lasts only a few seconds and then goes away. I have taken it to the dealership several times and they first said it was a heat sensor loose, so they tightened that... didn't work, they replaced the cat converter.... that didn't work.... now they are saying this is a normal sound! If this is normal, then why doesn't this happen every time i start it and why don't all of the cadillac STS do it? Very frustrated! The noise is extremely loud and embarrasing especially when people are around and they hear it... driving a $55,000 dollar cadillac, you wouldn't expect to hear a "normal" noise like that!

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  3. #2
    Cadillac Cust Svc's Avatar
    Cadillac Cust Svc is offline Cadillac Customer Service
    Automobile(s): All Cadillac vehicles!
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    Re: 2005 STS loud engine grind/rattle on start up only

    I'm so sorry to hear that, workmant! I would be happy to investigate this further for you; please send me an email anytime at Katie_Lucille@gmexpert.com and I can research on your behalf.

    Best,

    Katie
    Cadillac Customer Service

  4. #3
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
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    Re: 2005 STS loud engine grind/rattle on start up only

    You're describing the classic symptoms of an oil change and using the wrong filter that doesn't have an anti-drainback valve. Without the valve the oil in the engine drains back to the sump when you shut the engine off. On a restart it takes a while to build pressure again and the cam followers rattle to beat hell. Try replacing the oil filter with an OEM one that has the valve.
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