Thread: Need help engine knock??

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  1. #1 Re: Need help engine knock?? 
    GrandPrix Junkie
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    Catalytic convertor may be plugged. Remove the front O2 sensor and try driving it again.
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  2. #2 Re: Need help engine knock?? 
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    so remove the O2 sensor and not plug it back in then drive it again?
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  3. #3 Re: Need help engine knock?? 
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    remove the O2 sensor and try driving it again without it plugged in?
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