Piper Comanche PA-24 Service Manual page 608

Trollble
Fail,,", of .,.me to
idle properly.
Low power and uneven
running engine.
PDWERPlANT
ISSUED: 8/18172
PIPER COMANCHE SERVICE MANUAL
TABLE vnC-II. TIl0UB1.ESHOOTING CHAJl.T
(CODL)
(ENGlNE·TUIUIOCHAJI.GED)
c.u.
Ilemcdy
IDcotftc:t idle Refet to p ...... pb
adjllStlllCllt. 7C-43.
Idle mixtu",.
Refer to p ...... pb
7C-43.
Leak in the iaduction TiPteJI all COMccQons
sysa:m.
in the induction Sf'"
wn.
Replace aay
para that
&re
defec·
Oft.
Uneven cylinder Cbeck cylindet com·
compraaion.
pression.
Faulty ;pition Cbeck cnu", ignition
system. SYStem.
Impropet spari< plug
Rcgap 'Pari< plug.
pp setting.
Clogged injectOr nozzle. Rem ... e and clean,
p ...... pI\7C-46.
Dirty air fIItet.
Cbeck aad clean.
I""'fficicnt fuel Clean fuel Strainet and
pressUft.
check fuel pump.
.\1ixture too rich;
in-
Check injec:tor. Adjust
diuted by sluggish mixture taDtI'll!.
engine operation.
red c:'t!'laust flame
and black smoke.
Mixture too lean; in-
Check fuel lines for dirt
diuted by overheat·
or other resa1Ctlons.
ing or backfiring.
Check fuel supply
Cloggcd injector Remove and. dean.
nozzles.
paragraph 7C46
Leaks in inductlon
Tighten all connections.
system.
Replace defective
parts.
Ditt
11\
injector inlet
Remove screen and
screen.
clean.
Defective spark plugs. Clean or replace spark
plop.
Improper grade of Fill tank with recom-
fuel.
mended grade
212