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TROUBLE
Rough Idle (continued)
Poor Acceleration
Engine Runs Rough
Low Fuel Flow Gauge Indication
High Fuel Flow Gauge Indication
FUEL INJECTION
PROBABLE CAUSE
Improper idle mixture
Idle mixture incorrect
Unmetered fuel pressure too high
Worn linkage
Restricted nozzle
Improper mixture
Restricted flow to metering unit
Inadequate flow from fuel pump
Restricted flow beyond metering
valve
Restricted recirculation passage in
fuel pump
(continued)
CORRECTION
Adjust fuel mixture in accordance
with section 2, chapter 18, "Fuel
System Adjustment"
Adjust fuel mixture in accordance
with section 2, chapter 18, "Fuel
System Adjustment"
Lower unmetered fuel pressure.
Adjust in accordance with section 2,
chapter 18, "Fuel System
Adjustment."
Replace worn elements of linkage.
in accordance with the airframe
manufacturer's instruction
Clean. Replace nozzle if obstruction
cannot be cleared by solvent action.
Never use wire or any other object
to clear nozzle jet.
Adjust fuel mixture in accordance
with section 2, chapter 18, "Fuel
System Adjustment
Check for restriction between fuel
pump and fuel metering unit
Adjust engine-driven fuel pump in
accordance with section 2, chapter
18, "Fuel System Adjustment"
Check for restricted nozzles or fuel
manifold valve. Clean or replace as
required
Replace engine driven fuel pump
Troubleshooting
4-11
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