EDI DIAGNOSIS
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 5E-79
Troubleshooting Charts (Continued)
CONDITION POSSIBLE CAUSES CORRECTION
ENGINE HARD
TO START, OR
WILL NOT
START, SMOKE
FROM
EXHAUST.
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. 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 improperly
operating injectors.
4. Scan / Repair / Replace
components as needed.
5. Scan/Check/Time the pump.
6. Check compression to identify
the problem.
ROUGH IDLE
(IRREGULARLY
FIRING OR
ENGINE
SHAKING)
1. If engine is cold, glow plug
relay on glow plug(s)
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.
1. Refer to troubleshooting for
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 replace the
injector with the sticking
needle valve.
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