Poor Fuel Economy - Mercury MerCruiser D2.8L D-Tronic Service Manual

TROUBLESHOOTING

Poor Fuel Economy

1. Fuel leaks
2. Operator habits
3. Engine laboring
4. Clogged air cleaner
5. Engine compartment sealed too tight
6. Boat bottom
7. Turbocharger malfunction
8. Improper fuel
9. Crankcase ventilation system not
10. Engine operating too hot or too cold
11. Plugged or restricted exhaust
12. Engine
13. Injectors not functioning properly
14. Injection pump timing incorrect
Page 1C-14
Cause
working
SERVICE MANUAL NUMBER 22
Special Information
2. Prolonged idling; slow acceleration;
failure to cut back on throttle once boat
is on plane; boat over loaded; uneven
weight distribution
3. Bent, damaged, or wrong propeller.
Water test boat for proper operating
rpm at wide open throttle
5. Not enough air for engine to operate
properly
6. Dirty (marine growth), hook, rocker
12. Low compression
13. Refer to SECTION 5E for EDI
diagnosis
14. Refer to SECTION 5E for EDI
diagnosis
90-860074--1 FEBRUARY 2002