J.P. Instruments EDM 700/800/711 Pilots Guide - Manual (Page 24)

Page 20 Engine Data Management
Common Misapplications
Some of the more common misapplications made by first-time EDM
users are presented here in an attempt to help you avoid similar
problems.
Problem Situation Correction
LeanFind finds a
“peak” too soon. Failure to pre-lean
before performing
LeanFind or stopping
while leaning. Follow the pre-lean
procedure in the
section “LeanFind
Mode” on page 12.
Leaning too slowly. Lean more quickly.
Peak not found Lean Find not activated
or stopping while
leaning Lean at the speed of
approximately 10°F
per second.
Off-scale EGT
bars, too high or
low You forgot that you set
the EDM in the
Normalize view and
later observe off-scale
EGT bar readings. The higher sensitivity
(10° per segment) of
the Normalize view
can quickly go too high
or low off-scale with
only small changes in
EGT.
First cylinder to
peak is not the
hottest This is normal. The
first to cylinder peak is
not necessarily 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.
No display of
%HP Fuel flow not reading Fuel Flow option is
required for HP