Mercury MerCruiser D2.8L D-Tronic Service Manual page 648

EDI DIAGNOSIS
Troubleshooting Charts (Continued)
CONDITION
ENGINE
OPERATES
ROUGH
Page 5E-80
POSSIBLE CAUSES
1. Fuel injection lines leaking.
2. Air in the fuel or the fuel supply
is inadequate.
3. Contaminated fuel.
4. Incorrect valve operation.
5. Injection pump
incorrect.
6. Improperly
injectors.
7. Defective injection pump (fuel
quantity or solenoid valve).
8. Camshaft out of time.
9. Damaged camshaft
tappets.
10. Automatic timing advance not
operating.
SERVICE MANUAL NUMBER 22
CORRECTION
1. Correct leaks in the high
pressure
injectors sealing washers or
delivery valves.
2. Check the flow through the
filter and bleed the system.
Locate and eliminate the air
timing
source.
3. Verify by operating the engine
operating
with clean
temporary supply tank. Check
for presence of gasoline.
Replace fuel/water separator
filter.
4. Check for a bent push rod or
or
damaged roller lifter. Replace
parts if necessary.
5. Check/time pump (refer to
Grouped Fuel System).
6. Replace inoperative injectors.
7. Scan,
injection pump.
8. Check/correct
timing alignment.
9. Inspect camshaft valve lift.
Replace
tappets.
10. Check injection pump and
instrumented
number 1 cylinder.
90-860074--1 FEBRUARY 2002
lines, fittings,
fuel from a
repair or replace
gear train
camshaft and
injector at