J.P. Instruments EDM 960 Twin Pilots Guide - Manual (Page 14)

For Your Safe Flight Page 9
Continued:
Display Symptom Probable
Cause
Recommended
Action
Decrease in EGT
for one cylinder Intake valve not
opening fully; faulty
valve lifter. Have valve lifter or
rocker arm checked.
Increase in DIF
at low RPM Low compression
(blow by) in cylinder Check compression.
EGT and CHT
not uniform Normal for
carbureted engines.
Dirty fuel injectors or
fouled plugs. Check injectors and
plugs.
Decrease in EGT
for all cylinders Decreased induction
airflow. Carb or
induction ice. Check for change in
manifold pressure.
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.