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Re: 96 Mercury Crown Vic - MIL code 1390 Octane Adj.
Posted to Technical Tips Forum on 7/25/2000 1 Reply

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John, a P1390 indicates that the Octane Adjust shorting bar was removed. This will retard timing about 3 to 5 degrees (depends on calibration/engine). It is used when a vehicle pings a little. I don't... Login to read more.

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