Piper COMANCHE PA-24-180 Service Manual page 332

PIPER COMANCHE SERVICE MANUAL
TABLE VU114. TROUBLESHOOTING CART
(INGINE) (cont)
Cae
Trouble
Remedy
Fulure of enPine co idle
properly.
Incorect crburetor idle
adjutneBct.
Leak in the induction syserm.
Low cylinder compreuion.
Faulty ignition sysem.
Open prmar.
Improper park plug etting
for altitude.
Dirty ar filter.
Adjus duthole stop to
obain corect idle.
Adjnu mixture. Refer to
engine manufacturer's band-
book for prope procedure.
Tighten all connecions in the
induction syem. Replace
any pa rcba are defective.
Check cylinder compresion.
Check entire ignition systm.
Lock primer.
Check spark plug gIp.
Clean, refer to Pararaph 7-25.
Low power and uneven
running engine.
Mixture too rch; indicaed
by slugish engine
operation, red exhaus
flame and black moke.
Mixture too lean; indicaed
by overhebang or back-
firing.
Leaks in induction system.
Defective spark plulp.
Improper grade of fuel.
Magneto breaker poncs nor
working prupery.
Defective ignition wire.
Defective spark plug
ermunal connector.
Restriction in exhaust
system.
Improper ignition tming.
Check primer. Readjusw ent of
carburetor by authorized
personea indicated.
Check fuel lines for dirt or
other restmctions. Check
fuel supply.
Tighten all connections. Re-
place defective pars.
Clean or replace spark plug.
Fill tank with recommended
grade.
Clean poma.
Check internal tming of
magneto.
Check wire with elecnc
tester. Replace defective
wire,
Replace connectors on spark
plug wire.
Check for loose muffler baffles.
Check magnetos for rmning and
synchronization.
POWER PLANT
ISSUED: 8/18/72
2 B22