Page 22
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 13
.
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
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
