Mercury MerCruiser D2.8L D-Tronic Service Manual page 647

SERVICE MANUAL NUMBER 22
Troubleshooting Charts (Continued)
CONDITION
ENGINE HARD
TO START, OR
WILL NOT
START, SMOKE
FROM
EXHAUST.
ROUGH IDLE
(IRREGULARLY
FIRING OR
ENGINE
SHAKING)
90-860074--1 FEBRUARY 2002
POSSIBLE CAUSES
1. Contaminated fuel.
2. Fuel screen plugged.
3. One or more injectors worn
or not operating properly.
4. Malfunctioning, worn or
inoperative injection pump.
5. Injection pump out of time or
Timing Fault.
6. Engine compression low.
1. If engine is cold, glow plug
relay on glow
defective.
2. Idle speed / fuel quantity too
low for the accessories.
3. Engine mounts damaged or
lose.
4. High pressure fuel leaks.
5. Air in the fuel system.
6. Sticking needle valve in an
injector.
CORRECTION
1. Verify by operating the
engine with clean fuel from a
temporary tank. Check for
presence of gasoline. Drain
and flush fuel supply tank.
Replace fuel/water separator
filter.
2. Check fuel screen.
3. Check/replace
operating injectors.
4. Scan / Repair / Replace
components as needed.
5. Scan/Check/Time the pump.
6. Check compression to identify
the problem.
1. Refer to troubleshooting for
plug(s) cylinder head heater plugs
(see Group, Fuel System).
2. Adjust idle speed.
3. Repair or replace mounts.
4. Correct leaks in the high
pressure lines, fittings or
delivery valves.
5. Bleed the fuel system and
eliminate the source of the air.
6. Check and
injector with
needle valve.
EDI DIAGNOSIS
improperly
replace the
the sticking
Page 5E-79