Home> Continental & Lycoming TroubleShoot
Engine stumbles. Lycoming injected engine hangs at 1,700 to 1,80 rpm
1. Lycoming fuel injected engine using Bendix fuel servo.
 Oil in the
air regulator of the servo unit. Where did the oil come from? Possibly
the oil in the foam style air filter. Possibly the turbocharger has a seal
leak. A seal leak in the turbocharger can be caused by having the idle
rpm adjusted too low.
2. Overly rich engine. Rich mixtures are more noticeable at idle speeds.
A engine can better handle a rich mixture at power than at idle. Rich mixtures
are accompanied by rough idle, black smoke, engine may quit on landing
if power is pulled back. Fuel may drip out of carburetor. Check level of
carburetor float. Possibly composite float is sinking. Lycoming turbocharged
fuel injected engines with AN drive fuel pump-fuel pump diaphragm leak
allowing fuel leakage into the pump upper deck reference line resulting
in an enriched fuel/air mixture. Check fuel pressure into aircraft carburetor or
fuel injector.
Copyright 1995 by Sacramento Sky Ranch Inc.
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