Piper PA-24 Comanche Service Manual page 461

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PiPeR COMANCHE SERVICE MANUAL
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FIGURE 7C·7. FUEL INJECTOR
d. When the idlinl speed
has
been stabilized. move the cockpit mixnare conrrol with a smooth, steady
pull toward the "Idle Cut.()ff" position aDd observe the tachometer for ally chqe durin, the "ieatung"
process. Caution must be exercised to
renam
the mixture control to the "Full Rich" posinon before the
RPM
caD
drop to a point wbere the en,me cua out. An increue of more thm 50 RPM while "leaning out"
indicates an excessiveI)' rich idle mixture. An ilnmediate decn:uc in RPM
(if
not precccied by a momentary
increase) indicates the idle mixture is too ICUl.
e. If the above indicates that the idle adjusancnt is tOO rich or tOO lean, tum the idle mixture
adjuSUftel1t in
tbe diztttion reqUired for correction. and check this new position by repeating the above
procedure. Make additional adjusanents as necessary. Each time the adjuStment is changed, the engine
should be run up to 2000 RPM
to
dear the l"Iine bdore procecdin, with the RPM check..
~ake
final
adjuStment of the idle speed adjustment to obtain the
desired
idliDg RPM with closed throttle. The above
mctbod
aims
at a
scttinl
that
will obtain maximum RPM with minimwn manifold pressure. In case the
setting does not remain stable, check the idle IinkaIc; any looseness in
this
\inkage would cause erratic
idling. In all cases. allowance should be made for the effect of weather conditions and field altirude upon
idling adjumnent.
POWER PLANT
ISSUED: 8/1Sn2
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