Injector Test (Engine Misfiring) - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22
Read Precautions at front of this SECTION before proceeding.

Injector Test (Engine Misfiring)

7. Supply cooling water to seawater inlet holes.
8. Put on safety glasses.
9. With the engine operating at idle, carefully loosen injector pipe sleeve nut at injectors,
one cylinder at a time.
a. If idle rpm changes, injector is operating.
b. If idle rpm does not change, injector may be faulty.
Typical
10. Check all injectors, one at a time.
11. Stop engine. Replace injector or injectors as necessary.
12. If engine continues to misfire, check for mechanical problems (faulty injection pump,
burned valves).
90-860074--1 FEBRUARY 2002
a - Sleeve Nut At Injector
NOTICE
a
17 mm
FUEL INJECTORS
70148
Page 5C-9