EDI DIAGNOSIS
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 5E-83
Troubleshooting Charts (Continued)
CONDITION POSSIBLE CAUSES CORRECTION
LOW POWER
1. Throttle cable not moving to
full throttle.
2. High oil level.
3. Engine overloaded.
4. Slow throttle response
caused by leaking or
obstructed air control tube or
improperly operating
injection pump.
5. Inadequate intake air flow.
6. Inadequate fuel supply. Air in
the fuel.
7. Excessive exhaust
restriction.
8. High fuel temperature.
9. Poor quality fuel or fuel
contaminated with gasoline.
1. Check/correct for
stop-to-stop travel.
2. Check/correct oil level.
3. Check for added loading
from accessories or driven
units, brakes dragging and
other changes in vehicle
loading. Repair/replace as
needed.
4. Check for leaks and
obstructions. Tighter the
fittings. Repair or replace the
pump, if Scan/Check
determines pump is not
functioning.
5. Inspect/replace air cleaner
element. Look for other
restrictions.
6. Check the flow through the
filter to locate the source of
the restriction. Check fuel
pressure and inlet restriction.
7. Check/correct the restriction
in the exhaust system.
8. Verify that fuel heater, if
equipped is off when engine
is warm. Check for restricted
fuel return lines.
Repair/replace as needed.
9. Verify by operating from a
temporary tank with good
fuel. Check for presence of
gasoline. Replace fuel/water
separator filter.
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