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Oil Aeration/Poor Idle

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  1. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn A/C off. Using scan tester, access ICP PID from PID/DATA monitor menu. See ADDITIONAL SYSTEM FUNCTIONS in the TESTS W/CODES - 7.3L DIESEL article.
  2. Start engine and hold at wide open throttle for one minutes. ICP PID should be 1100-1750 psi (7585-12066 kPa). If ICP PID reading increases to more than 1750 psi (12066 kPa) after one minutes, anti-foam additives may have become depleted from oil. Change oil and retest.
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