Piper Navajo Chieftain PA-31-350 Service Manual page 502

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE VIII-IV. TROUBLESHOOTING CHART (ENGINE) (cont)
Trouble
Cause Remedy
Failure of engine to idle
properly.
Incorrect idle mixture.
Leak in the induction
system.
Adjust mixture.
Tighten all connections in
the induction system. Re-
place any parts that are
defective.
Incorrect idle adjustment.
Uneven cylinder com-
pression.
Faulty ignition system.
Insufficient fuel pressure.
Adjust throttle stop to
obtain correct idle.
Check condition of piston
rings and valve seats.
Check entire ignition system.
Adjust fuel pressure.
Low power and uneven
running.
Mixture too rich as in-
dicated by sluggish engine
operation, red exhaust
flame at night. Extreme
cases indicated by black
smoke from exhaust.
Readjustment of fuel in-
jector by authorized per-
sonnel is indicated.
Mixture too lean; indi-
cated by overheating or
backfiring.
Leaks in induction
system.
Defective spark plugs.
Improper fuel.
Magneto breaker points
not working properly.
Check fuel lines for dirt
or other restrictions. Check
fuel injection nozzles.
Tighten all connections. Re-
place defective parts.
Clean and gap or replace
spark plugs.
Fill tank with fuel of
recommended grade.
Clean points. Check timing
of magnetos.
Reissued: 9/23/80
POWER PLANT
2J15