Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 73Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 73

IGNITION
PROBLEMCONDITION Timing Will Not Advance

Probable Cause Low Oil PressureEngine Over Heating: timing retards and fluctuates, rpm will remain below 2000 rpm (ECM) Low Oil PressureEngine Over Heating:timing retards and fluctuates, rpm will remain below 2000 rpm Ignition CoiVHigh Tension Lead(s) Spark Plug Cap(s) Spark Plug(s) (ECM) Unit Ground Connection:(ECM) ignition coil stator

Perform Test No3

Engine Misfires At High RPM

Engine Hard To Start Cold

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