J.P. Instruments EDM-730 Pilot's Manual page 34

Display Symptom
EGT and CHT
not uniform
Decrease in
EGT for all
cylinders
Slow rise in
EGT. Low CHT
High CHT on
cylinders on one
side of engine
Rapid rise in
EGT/CHT of one
cylinder
Sudden off scale
rise for any or all
cylinders
Page 34
Probable Cause
Dirty fuel injectors or Check injectors and
fouled plugs. plugs. Non-uniformity
is normal for
carbureted engines
Decrease in airflow Check for change in
into the induction manifold pressure.
system. Carb or
induction ice. Check that the alarm
limits are set to
Engine units set to Celsius degrees
Celsius
Burned exhaust Have compression
valve. CHT is low due checked.
to low power output.
Obstruction under Check for improper
cowling. installed baffling, cowl
flap misalignment or
bird nests.
Detonation. Reduce power.
Pre-ignition, Full rich and reduce
power,
or Normalize view, Change to
Percentage view,
or failed probe. Check probe.
Engine Data Management
Recommended
Action