Page 26
Engine Data Management
Display
Symptom
Probable Cause
Recommended
Action
EGT and CHT
not uniform
Dirty fuel injectors
or fouled plugs.
Check injectors and
plugs. Non-
uniformity is normal
for carbureted
engines
Decrease in
EGT for all
cylinders
Decrease in airflow
into the induction
system. Carb or
induction ice.
Engine units set to
Celsius
Check for change
in manifold
pressure.
Check that the
alarm limits are set
to Celsius degrees
Slow rise in
EGT. Low
CHT
Burned exhaust
valve. CHT is low
due to low power
output.
Have compression
checked.
High CHT on
cylinders on
one side of
engine
Obstruction under
cowling.
Check for improper
installed baffling,
cowl flap
misalignment or
bird nests.
EGT on one
cylinder jumps
up and down
100°
Spark plug fouling
at higher
temperatures.
Check spark plug.
Sudden off
scale rise for
any or all
cylinders
Pre-ignition
or Normalize view.
or failed probe
Full rich and reduce
power.
Change to
Percentage view.
Check probe
