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