J.P. Instruments EDM 700/800/711 Pilots Guide - Manual (Page 27)

For Your Safe Flight Page 23
Display Symptom Probable Cause Recommended
Action
CHT
300
400
500
EGT and CHT
not uniform Dirty fuel injectors
or fouled plugs. Check injectors and
plugs. Non-
uniformity is normal
for carbureted
engines
CHT
300
400
500
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
CHT
300
400
500
Slow rise in
EGT. Low
CHT Burned exhaust
valve. CHT is low
due to low power
output. Have compression
checked.
CHT
300
400
500
High CHT on
cylinders on
one side of
engine Obstruction under
cowling. Check for improper
installed baffling,
cowl flap
misalignment or
bird nests.
CHT
300
400
500
Rapid rise in
CHT of one
cylinder Detonation. Reduce power.
CHT
300
400
500
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