FNM HPE Series Owner's Manual page 128

Possible Fault
If the engine does not reach maximum rpm under load
Engine overloaded.
Dirty hull/propeller
Insufficient comburent air.
Air in fuel supply system.
Fuel filter clogged with water and/or contamination.
Fuel pre filter clogged
Leaking in the fuel supply line or fuel injection line
Incorrect lube oil SAE class or quality for ambient
temperature.
Wrong fuel quality or contaminated fuel.
Oil level too high.
Leak in the air manifold. Dirty intercooler.
Clogged exhaust.
Damaged turbocharger
Dirty injectors
Transmission.
124
Possible Remedy
Check the propeller size /incorrect propeller
Clean
Check .
Check and bleed.
Check or replace.
Clean /replace.
Check / replace.
Replace.
Check fuel. Drain and flush fuel tank. Replace with new fuel.
Reduce the level.
Check /replace and clean
Check/clean.
Replace.
Check, replace if required.
Check.
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FNM HPE Series