Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - dtc's on obd2 Need help understanding.
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Old 04-21-2008, 08:41 PM
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The lean code would more than likely be a vacuum leak somewhere. The 690 code is sensing the voltage input to the ECM power circuit is too high...make sure that the oe GTO circuit did not reduce input to the ecm (not run 13.8-14.1V straight off the alternator). An understanding garage or friend would be able to get you a spec sheet and wiring diagram.
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