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    crjslick50's Avatar
    crjslick50 Posts: 21, Reputation: 2
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    #1

    Nov 19, 2008, 10:29 PM
    96 cadillac sts rattling sound at 2800 rpms why
    I recently purchased a 96 cad sts and it has 200,000 miles otherwise perfect cond. Prior owner used premium gas which is required. I was cheap started putting cheap gas in and I just started hearing a rattling noise at about 2800 rpms. Also when I first start it I hear a rattle and little puff smoke came out exaust? Seems to be getting worse anyone know what it could be?
    watauga21's Avatar
    watauga21 Posts: 11, Reputation: 1
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    #2

    Nov 20, 2008, 09:18 AM
    Your valve seal may be going. I would go to a auto store and ask for octane boost it only cost about $3.00
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