J.P. Instruments EDM 960 Twin Pilots Guide - Manual (Page 15)

For Your Safe Flight Page 10
Continued:
Display Symptom Probable
Cause
Recommended
Action
Rapid rise in
CHT of one
cylinder Detonation. Reduce power.
Sudden off scale
rise for any or all
cylinders
Pre-ignition - >
Normalize view - >
or failed probes - > Full rich & reduce
power.
Change to Standard
view
Check probes
(no picture)
Loss of peak
EGT Poor ignition or vapor
in fuel injection
system. Have magneto
tested.
(no picture)
Decrease in
peak or flat EGT
response to
leaning process Detonation. Usually
the result of 80
Octane fuel in 100
Octane engine. Enrich mixture,
reduce power and
relean mixture.
Repeat to find power
setting where normal
peak is obtained or
run rich.
Below 10,000 ft.
full throttle
causes EGTs to
rise Weak or defective
mechanical fuel
pump. Apply booster pump.
If EGTs drop, replace
fuel pump.