W
INSPECTION AND ADJUSTMENT
- Idle Speed and Idle Mixtur
e
(
d) Remove the tachometer
and SST
.
SST 09843-1802
0
6
. ADJUST IDLE MIXTURE (MODELS WITHOUT TWC)
NOTICE
: It
is
usually
not necessa
ry
to adjust the
idle
mixture in most
models,
provided that the
vehicle
is in
good condition
. However, if it does become necessa
ry
to do so,
always
use a CO meter
. If a CO meter is not
available,
it is best not to attempt to adjust the
idle
mixture if at
all possible
.
(a) Race the engine at 2,500 rpm for approx
. 90
seconds
.
(b) Insert a testing probe at least 40 cm (1
.3 ft) into
the tailpipe
.
(c) Measure the CO concentration for 1 to 3 minutes
.
Idle CO concentration
:
1
.5 ± 0
.5
%
(cooling
fan off
)
If the CO concentration is not as specified, adjust the
idle mixture by turning the idle mixture adjusting screw
in the variable resistor
.
• If the concentration is within the specification, this
adjustment is complete
.
NOTE
: Always check the idle speed after turning the
idle mixture adjusting screw
. If it is incorrect, repeat
steps 5 and 6
.
173
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