Piper PA-24 Comanche Service Manual page 389

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PIPER
COMANCHE :iERVICE MANl'AL
TABLE VilA-III.
TROL'BLESHOOTI~G
CHART
(E~GI~E)
(CARBCRETOR) (cont)
Trouble Cause Remedy
Failure of engine to idle
Incorrect carburetor idle Adjust throttle stop to
properly. adjustment. obtain correct idle.
Idle mixture. Adjust mixture. Refer to
engine manufacturer's
handbook for proper
procedure.
Leak in the induction
Tighten all connections in
system.
the induction system.
Replace any parts that
are defective.
Low cylinder compression.
Check cylinder compression.
Faulty ignition system.
Check entire ignition .;~
<tern.
Open primer. Lock primer.
Improper spark plug Check spark plug gap.
setting for altitude.
Dirty air filter. Clean. refer
to
Paragraphs
7A-35. 7A-39.
i,.\-.
.o.
Low powe rand uneven
Mixture too rich: indicated
Check primer. Readjustment
running engine. by sluggish engine of carburetor hy author-
operation. red exhaust ized personnel indicated.
name and black smoke.
Mixture too lean; indicated
Check fuel lines for dirt or
by overheating or back- other restrictions. Check
firing. fuel supply.
Leaks in induction system.
Tighten all connections.
Replace defective parts.
Defective spark plugs. Clean or replace spark plug.
Improper grade of fuel. Fill tank with recommended
grade.
Magneto breaker points not Clean points.
working properly. Check internal timing of
magneto.
Defective ignition wire. Check wire \\ ith electric
tester. Replace defective
wire.
Defective spark plug Replace connectors on spark.
terminal connectors. plug wire.
Restriction in exhaust Check for loose muffler
system. bartles.
Improper ignition timing. Check magnetos for trimming
and synchronization.
ISSl'ED: 8/18/72
2E9
POWER PLA'Y