Piper COMANCHE PA-24-180 Service Manual page 391

PIPER COMANCHE SERVICE MANUAL
TABLE VIIA-III TROUBLESHOOTING CHART
(ENGINE) (CARBURETOR) (cont)
Cause
Trouble Remedy
Failure of engine to idle
properly
Incorrect carburetor idle
adjustment
Idle mixture.
Leak in the induction
system
Low cylinder compression
Faulty ignition system
Open primer.
Improper spark plug
setting for altitude.
Dirty air filter
Adjust throttle stop to
obtain correct idle
Adjust mixture. Refer to
engine manufacturer's
handbook for proper
procedure.
Tighten all connections in
the induction system
Replace any pans that
are defective
Check cylinder compression
Check entire ignition system
Lock primer
Check spark plug gap
Clean. refer to Paragraphs
7A-35. 7A-39. 7A-43
Low power and uneen
running engine
Mixture too rich. indicated
by sluggish engine
operation. red exhaust
flame and black smoke.
Mixture too lean. indicated
by overheating or back-
firing
Leaks in induction system.
Defective spark plugs
Improper grade of fuel
Magneto breaker points not
working properly.
Defective ignition wire.
Defective spark plug
terminal connectors
Restriction in exhaust
system
Improper ignition timing
2E9
Check primer. Readjustment
of carburetor by author-
i7ed
personnel indicated
Check fuel lines for dirt or
other restrictions Check
fuel supply
Tighten all connections
Replace defective parts
Clean or replace spark plug
Fill tank with recommended
grade
Clean points
Check internal timing of
magneto.
Check wire with electric
tester Replace defective
wire.
Replace connectors on spark
plug wire
Check for loose muffler
baffles
Check magnetos for trimming
and synchroni7ation
POWER PLANT
ISSUED: 8/18/72