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Pinging 850 1996

posted by  magnetmann on  Wed Jul 31 10:44 CST 2002
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My normally aspirated 850 is developing progressively worsening pinging. in a narrow rpm band around 1800. This is barely present, if at all, on 93 octane fuel, but gets much worse as the octane declines. No "check engine" light; no codes. Runs as smoothly as ever.

Any suggestions as to what to fix?






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