Jeep J-10 Series 1982 Technical & Service Manual page 405

BOWL VENT
LINE
TACHOMETER
CONNECTOR
(BROWN)
MIXTURE CONTROL
SOLENOID
90766
Fig. 1J-157 Idle Mixture Adjustment Preparation
WARNING: Use extreme caution when perform ing ad
justment while engine is operating. Thefan, pulleys and
belts can cause serious personal injury. Avoid wearing
loose clothing. Do not stand in direct line with fan.
(8) Start engine and operate at fast idle for at least
three minutes to allow C4 System to switch to Closed
Loop Operation.
NOTE: Adjusting Tool J-29030 is required for
adjustments.
MIXTURE CONTROL
SOLENOID
LEAN MIXTURE
SCREW (DO NOT
ADJUST)
RICH MIXTURE SCREW
(DO NOT ADJUST)
FUEL SYSTEMS 1J-91
(9) Return engine to idle and adjust idle speed to
700 rpm.
(10) Adjust idle mixture screw (fig. 1J-158) to obtain
an average dwell as specified in Specifications. If dwell
is too low, slowly back screw out. If too high, slowly turn
in. Allow time for dwell to stabilize after each adjust
ment. Adjustment is very sensitive. Make final dwell
check with adjusting tool removed. If unable to adjust to
specification, inspect idle circuit for leaks, restrictions,
etc.
(11) Disconnect MC solenoid wire connector and ob
serve tachometer for an engine speed change of at least
50 rpm. If speed does not change enough, inspect idle air
bleed circuit for restrictions, leaks, etc. Connect MC
Solenoid wire connector.
(12) Connect purge and bowl vent hoses, EGR valve
hose, and adjust idle speed according to Emission Con
trol Information label instructions. Remove tachometer
and dwell meter.
C4 System Tests and Trouble Code Diagnosis
The self-diagnostic system does not detect all possible
faults. The absence of a trouble code does not indicate
there is not a malfunction with the system. To deter
mine whether or not a system problem exists, an oper
ational test is necessary. Refer to figure 1J-159 for ter
minal identification.
NOTE: The System Operational Test should also be
performed after all repairs on the CJ System have been
completed.
IDLE AIR BLEED SCREW
DO NOT ADJUST IF PLUG
IS IN PLACE)
NOTE: IDLE MIXTURE
NEEDLE PLUG MUST
BE REMOVED BEFORE
ADJUSTMENT.
IDLE MIXTURE NEEDLE
AND SPRING
PLUG
90767
Fig. 1J-158 Model E2SE Carburetor Adjustment Screws