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  1. Rattle noise on cold start and only lasts 3 secs

    Cadillac CTS First Generation Forum - 2003 - 2007
    I have a first gen CTS and I've had an issue for now a cpl years now. On cold start I have a horrible rattling noise like im bending all my valves and it only lasts for about 3 secs and goes away. Runs and drives perfect, no codes, no noise on acceleration. Oil changes frequently. So anybody run...
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