Technical data

13773-001
71-00
Page 330 Nov 2000
Engine Will Not Run At Idling
Speed
Fuel injection system improperly
adjusted.
See “Engine Fuel System Trouble-
shooting.” (Refer to 73-00)
Air leak in intake manifold. Torque loose connection or
replace malfunctioning part
Rough Idling Fuel injection system improperly
adjusted.
Adjust fuel system in accordance
with IO-550 Maintenance Manual
Chapter 22 “Fuel System Adjust-
ment.” (Refer to TCM Model IO-
550 Overhaul Manual)
Mixture levers set for improper
mixture.
Adjust the manual mixture control
in accordance with the Pilot’s
Operating Handbook (POH). (List
of Publications)
Fouled Spark Plugs. Remove, clean and adjust gaps in
accordance Chapter 74, “Igni-
tion”. (Refer to 74-00)
Hydraulic tappets fouled. Replace fouled tappets. Inspect
and clean oil filter at more frequent
intervals.
Burned or warped exhaust valves
worn seat, scored valve guides.
Inspect, repair or replace cylinder.
Replace any burned, warped or
worn exhaust valves.
Manifold valve vent obstruction. Repair or replace manifold valve.
Engine Runs Too Lean At Cruising
Power
Improper manual leaning proce-
dure.
Refer to the Pilot’s Operating
Handbook (POH) for engine oper-
ating instructions. (List of Publica-
tions)
Fuel injection system maladjusted. Adjust fuel system in accordance
with IO-550 Maintenance Manual
Chapter 22, “Fuel System Adjust-
ment. (Refer to TCM Model IO-
550 Overhaul Manual)
Engine Runs Too Rich At Cruising
Power
Restrictions in air intake passages
Improper manual leaning of Fuel/
Air mixture.
Check passages and remove
restrictions See the Pilot’s Operat-
ing Handbook (POH) for correct
leaning procedure. (List of Publi-
cations)
Engine Runs Too Lean Or Too
Rich At Throttle Setting Other
Than Cruise
Fuel injection system maladjusted. See “Engine Fuel System Trouble-
shooting”. (Refer to 73-00)
TROUBLE PROBABLE CAUSE REMEDY