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Home › Infiniti › 1993 › Q45 a › Repair and Diagnosis (Single Page) › Engine Performance › System › Engine Controls - Tests W/O Codes › Symptoms › Surging

Engine Controls - Tests W/O Codes: Symptoms: Surging

Check oxygen sensor(s).
Check EGR operation. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.
Replace ECM with known good unit.