Piper Comanche PA-24 Service Manual page 557

Trouble
Failure of e."me t.,
idle properly.
Low power and uneven
ruJUlllII·
POWER PLANT
ISSUED: 9/18/72
PIPER COMANCHE SERVICE MANUAL
TABLE V1IB-U. TROUBLESHOOTING t:HAJtT
(ENGINE)
(coat)
ea.. ..
Remedy
Incorrect idle adjustment AQjust throttle stop to obtain
correct idle.
Insufficient fuel pressure. Check fuel mainer IIId pump
pressure adjustment.
Cloged injector nozl ...
Remove and flush with acetone.
Blow through orifice with
comp ...... d air· 100 psi.
Leak in induction
system. Tish"n all conaecUons in
the induction SYStem. Re-
place Illy defective partS.
Low cylinder compression. Check condi';"n of piston
rinp and
:, e seats.
Faulty ignition system. Cbeck entire ignition system.
Mixture roo rich; indicarecl
Injector may need rec&li-
by slugish e.,.me oper- bratioD by aumonled
a.tion. red exhaust flame
personnel.
It
night. Extreme aseo
indicatecl by black $IIIOke
from exhaust.
M.ixture
tOO
lean
i
inciicared
Check fuel supply. Check
by overheating or back· fuel lin .. for obsttllctlono
flrinc·
or resai.ctions.
Leaky nozzle.
Remove nozzle and blow uno
it. All escaping through
the nozzle valve indicates
leaking. Replace nozzle.
Clogged injector nozzl ...
Remove and flush with acerone.
Blow through onfi« With
comp ...... d air . 100 psi.
Dirt in inlet saeen.
Remove screen and flush with
~etone. BLow
with
compressed air.
Dirt in • .,... ficting.
Remove ''T'' fitting
at
distri-
buror. clean in acetone.
Blow through onfice with
compressed au·
loo
PSl.
Fuel supply pressure
Check fuel pump pr .. sute
excesSively high.
2
G3