Question about 1996 Oldsmobile Bravada

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Gas milege falling and loud squeal and rattle

I've lost 2mpg in the past week. I have loud rattle which sounds like it is coming from the catalytic converter. Also when I try to kick it down I get a squeal or whistle noise that sound like a turbo but only while driving not when in park

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  • Olds  Bravada
    Olds Bravada May 18, 2009

    yeah plus o2 sensor out

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Most likely your honeycomb is broken loose inside your catalytic converter.If it breaks into smaller pieces it can start to restrict the exhaust outout & make starnge sounds like a turbo winding up.I would replace the convereter & go from there.Hope this helps

Posted on May 16, 2009

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