EM ...
ENGINE MECHANICAL
Engine Tune-up (4"·GE)
COMlle,
IDLE HelCO CONCENTRATION CHECK
METHOD (wI TWcl
NOTE:
This ChKk
I,
used onlv to determine whelher or
nol the idll HCICO complies with regulltions.
1.
INITIAL CONDITIONS
Ie)
Engine
81
reach norm.l oper.ling tempe.,tu,e
fbi
Air ele_r onltalled
!cl
AI pipes and hoses of ai, indue,ion system con-
-'"
(dl
All accetllories switched
OFF
Ie)
An
�acuum lines p.openy COMe(:led
NOTE
:
A
l
l vacuum hoses lor EGR systems. et
c
.
should
be property connflCled
III
EFt
syltem wiring connectors fully plugged
(gl Ignition liming set Conetlly
!hI
Tlensmission
In
N
range
(;l
Tachometer .nd
He/CO
mete, calibrated loci
81
nand.
2.
CHECK OXYGEN SENSOR (5
••
palle
F'·10ll
3.
CHECK VF VOLTAGE
4.
5.
..
t.)
Conn8<:t the positive
l.!oj
probe
01
a voltmeter to ter
minal
VF
of the check cOl1neclo,. and neg.tivI
ld
probe to IlIrmiOllI
IE I.
til Hold the engine speed al
2,500 rpm
lor
Ippro�. 90
lII'Conds to
WIt1'TTl
up the o�yge" .ensor.
Ie)
With engine idling. me
••
ure lhe
VF
voIuo
g
e
.
VF
volt'ge:
2.5
�
0.6
V
If thl
Vf
voluoge is nol .. specIfied. ehe<;k
the
air Induc
tion system.
If
necesslry.
1M
Efl
SYSTEM.
RACE ENGINE AT
2.500
RPM fOR APPROX.
110
SECONDS
INSERT CO METER TESTING PROBE INTO
TAilPIPE AT LEAST
40
em
11.3 Itl
CHECK CO CONCENTRATION AT IDLE
Wail .t tellSt one minute befor. mellSuring to Iallow the
ooneenlTllion to "abili�l. Complete Ihe measuring within
three minutH.
Idle CO
eooeentrltion:
0 - 0.5
%
Iwl Cooling 'In
OFF)
If
the CO eOOCflltfation dOllS not conform
10
'l!1Iulalion5.
$tie the table below for po.sible (aU$tIs.
