Piper SEMINOLE PA-44-180, Maintenance Manual

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PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
7 1 - 0 2 - 0 0
Page 71-03
Revised: May 15, 1989
3E1
CHART 7101. TROUBLESHOOTING (ENGINE) (cont)
TROUBLE CAUSE REMEDY
Failure of engine to idle Sniffle valve stuck open, 180T Clean or replace valve.
properly. (cont) only.
Fouled spark plugs. Clean or replace plugs.
Incorrect idle adjustment. Adjust throttle stop to obtain
correct idle.
Uneven cylinder compression. Check condition of piston rings
and valve seats.
Faulty ignition system. Check entire ignition system.
Insufficient fuel pressure. Adjust fuel pressure.
Low power and uneven Mixture too rich; indicated by Readjustment of carburetor
running. sluggish engine operation, red by authorized personnel is
exhaust flame at night. indicated.
Extreme cases indicated by
black smoke from exhaust.
Mixture too lean; indicated Check fuel lines for dirt or
by overheating and backfiring. other restrictions.
Leaks in induction system. Tighten all connections.
Defective spark plugs. Clean and gap or replace
spark plugs as necessary.
Improper fuel. Drain fuel tank and refill with
recommended grade fuel.
Magneto breaker points not Clean points. Check internal
working properly. timing of magnetos.
Defective ignition wire. Check wire with electric tester.
Replace defective wire.
Defective spark plug terminal Replace connections on spark
connectors. plug wire.
Sniffle valve stuck open, 180T Clean and/or replace valve.
only. Refer to sniffle valve this chapter.
PIPER AIRCRAFT