1
C
TROUBLESHOOTING
SERVICE MANUAL NUMBER 23
Page 1C-1
90-861326--1 MARCH 1999
IMPORTANT INFORMATION
Section 1C - Troubleshooting
Table of Contents
Precautions 1C-2. . . . . . . . . . . . . . . . . . . . . . . . . .
Used Spark Plug Analysis 1C-3. . . . . . . . . . . . . .
Spark Plug Analysis 1C-4. . . . . . . . . . . . . . . . . . .
Normal Condition 1C-4. . . . . . . . . . . . . . . . . . .
Chipped Insulator 1C-4. . . . . . . . . . . . . . . . . . .
Wet Fouling (Oil Deposits) 1C-4. . . . . . . . . . .
Cold Fouling 1C-5. . . . . . . . . . . . . . . . . . . . . . .
Overheating 1C-5. . . . . . . . . . . . . . . . . . . . . . .
High Speed Glazing 1C-5. . . . . . . . . . . . . . . . .
Scavenger Deposits 1C-6. . . . . . . . . . . . . . . .
Pre-Ignition Damage 1C-6. . . . . . . . . . . . . . . .
Reversed Coil Polarity 1C-6. . . . . . . . . . . . . . .
Splashed Deposits 1C-7. . . . . . . . . . . . . . . . . .
Mechanical Damage 1C-7. . . . . . . . . . . . . . . .
Poor Boat Performance and/or Poor
Maneuverability 1C-8. . . . . . . . . . . . . . . . . . . . . .
Improper Full Throttle Engine RPM 1C-9. . . . . .
RPM Too High 1C-9. . . . . . . . . . . . . . . . . . . . .
RPM Too Low 1C-9. . . . . . . . . . . . . . . . . . . . . .
Engine Cranks Over But Will Not Start
Or Starts Hard 1C-10. . . . . . . . . . . . . . . . . . . . . .
Important Information 1C-10. . . . . . . . . . . . . .
Fuel System Rich 1C-10. . . . . . . . . . . . . . . . . .
Fuel System Lean 1C-10. . . . . . . . . . . . . . . . .
Miscellaneous 1C-10. . . . . . . . . . . . . . . . . . . . .
Engine Will Not Crank Over 1C-11. . . . . . . . . . . .
Charging System Inoperative 1C-11. . . . . . . . . .
Noisy Alternator 1C-12. . . . . . . . . . . . . . . . . . . . . .
Instrumentation Malfunction 1C-12. . . . . . . . . . .
Radio Noise 1C-12. . . . . . . . . . . . . . . . . . . . . . . . .
Poor Fuel Economy 1C-13. . . . . . . . . . . . . . . . . .
Engine Runs Poorly at Idle 1C-13. . . . . . . . . . . .
Engine Runs Poorly At High RPM 1C-14. . . . . .
Engine Acceleration Is Poor 1C-14. . . . . . . . . . .
Troubleshooting with Vacuum Gauge 1C-15. . .
Engine Noise 1C-15. . . . . . . . . . . . . . . . . . . . . . . .
Important Information 1C-15. . . . . . . . . . . . . .
Valve Cover Area 1C-16. . . . . . . . . . . . . . . . . .
Cylinder Area 1C-16. . . . . . . . . . . . . . . . . . . . .
Camshaft Area 1C-17. . . . . . . . . . . . . . . . . . . .
Crankshaft Area 1C-17. . . . . . . . . . . . . . . . . . .
Miscellaneous 1C-18. . . . . . . . . . . . . . . . . . . . .
Oil Pressure 1C-19. . . . . . . . . . . . . . . . . . . . . . . . .
Miscellaneous 1C-19. . . . . . . . . . . . . . . . . . . . .
Low Oil Pressure 1C-20. . . . . . . . . . . . . . . . . .
High Oil Pressure 1C-20. . . . . . . . . . . . . . . . . .
Excessive Oil Consumption 1C-21. . . . . . . . . . . .
Water In Engine 1C-22. . . . . . . . . . . . . . . . . . . . . .
Important Information 1C-22. . . . . . . . . . . . . .
Water on Top of Pistons 1C-23. . . . . . . . . . . .
Water in Crankcase Oil 1C-23. . . . . . . . . . . . .
Engine Overheats 1C-24. . . . . . . . . . . . . . . . . . . .
Mechanical 1C-24. . . . . . . . . . . . . . . . . . . . . . .
Engine Overheats 1C-25. . . . . . . . . . . . . . . . . . . .
Cooling System 1C-25. . . . . . . . . . . . . . . . . . .
Insufficient Water Flow from Belt
Driven Seawater Pickup Pump 1C-26. . . . .
Power Steering 1C-27. . . . . . . . . . . . . . . . . . . . . .
Poor, Erratic or No Assist 1C-27. . . . . . . . . . .
Noisy Pump 1C-28. . . . . . . . . . . . . . . . . . . . . . .
Fluid Leaks 1C-28. . . . . . . . . . . . . . . . . . . . . . .
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