J.P. Instruments EDM 760 Pilots Guide - Manual (Page 26)

Be alert for:
•
CLD: shock cooling alarm is set to -60°F. Average cool rates of
-40°F/minute to –60°F/minute are normal, depending on the
engine size.
Common Misapplications
Some of the more common misapplications made by first-time EDM-760
users are presented here in an attempt to help you avoid similar problems.
Problem Cause Correction
finds a premature
“false” peak.
Failure to pre-lean before
performing LeanFind.
Follow the pre-lean
procedure on page
13.
Pausing during leaning. Lean continuously, do
not pause.
Retarding mixture too
slowly. Lean more quickly.
Peak not found Leaning too quickly. Lean at the speed of
approx. 10°F per sec.
Off-scale EGT bars,
too high or low EDM-760 is in the
Normalize view and later
observe off-scale EGT bar
readings.
Set to Percentage
view
First cylinder to peak
is not the hottest This is normal. The first
to cylinder peak is
unrelated to the hottest.
EGTs rise during
single magneto check
This is normal, due to
incomplete combustion
persisting longer.
EGTs not uniform
during low power
operation
This is normal. Fuel and air
distribution is not optimal at low
power settings.
Page 22 Engine Data Management