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Air pump
I
Operate
engine
until
it
reaches
normal
operating
temperature
2
Inspect
all
hose
hose
connec
tions
and
air
gallery
for leaks
and
correct
if
necessary
before
checking
air
injection
pump
3
Check air
injection
pump
belt
tension
and
adjust
to
specifications
if
necessary
4
Disconnect
air
supply
hose
at
check valve
5
Disconnect
vacuum
hose from
the
air
control
valve
California
type
only
6
Insert open
pipe
end ofAir
Pump
Test
Gauge
Adapter
STl9870000
in
air
supply
hose
Clamp
hose
securely
to
adapter
to
prevent
it
from
blowing
out
Position
adapter
and
test
lliuge
so
that
air
blast emitted
through
drilled
pipe plug
will be
harmlessly
dissipated
7
Install
a
tachometer
on
engine
With
engine
speed
at
2
600 rpm ob
serve
pressure
produced
at
test
gauge
Air
pressure should be 100
mmHg
3
94
inHg
or more
8
If
air
pressure
does
not
meet
above
specifications
proceed
as
fol
lows
I
Repeat
2 and
3
above
2
Disconnect
air
supply
hose
at
anti backf i r e
valve
Plug
air
hose
open
ing
and
screw
with
a
clamp
Repeat
pressure
test
3
With
engine
speed
at 1
500 rpm
close hole of
test
gauge with
finger
If
a
leaking
sound is heard
or
leaking
air
is felt
by
ftnger
at
relief valve relief
valve
is
malfunctioning
Relief valve
should be
replaced
or
repaired
4
If
air
injection
pump does
not
meet
minimum
requirement
of
pres
sure
test it
should be
replaced
Control valve
The
following
procedures
are
reo
commended
for
checking
and
or as
certaining
that the various components
of the exhaust
emission
con
Irol
system
are
operating
properly
The
engine
and all
components
must
be
at
normal
operating
tempera
tures
when the
tests
are
performed
Prior
to
performing
any
extensive
diag
nosis
of the exhaust control system
it
Emission Control
System
must
be determined
that
the
engine
as
a
unit is
functioning properly
Check valva
Warm
up
engine
thoroughly
2
Disconnect hose
leading
to
check
valve from
air
hose
COJUlector
3
Check hose
opening
for
any
indi
cation
of
exhaust
gas leaks Ifleaks
are
detected
replace
check valve
4
Race the
engine
lightly
at
about
2 000 cpm
and then
return
it
to
idling VisuaDy
check the hose for
any
indication of exhaust gas leaks before
the
engine
returns to
idling
speed
If
leaks
are
detected
replace
check valve
EC310
Fig
EC 43
Checking
check valve
Air pump raIle
valve
After
completing inspection
of
air
pump check
air
pump relief valve
in
the
following
steps
J
Disconnect hoses
leading
to
check
valve and
air
control valve from air
hose
connector
and
install blind cap
to
the
connector
2
With
engine
running
at
about
3 000
rpm
under
no
load
place
your
hand
on
the
air
outlet of
air
pump
relief valve
to
check for
discharged
air
If
no
air is
felt
replace
the
air pump
relief valve
EC311
Fig
EC 44
Checking
air pump
relief
valve
EC
18
Air control valve
C U ornla models
I
Warm
up
engine
thoroughly
2
Before
checking
air control
valve
check all
hoses
for loose connection
leaks
etc
and
repair
or
correct
if
necessary
3
With
engine idling
disconnect the
outlet side
hose
of the
air
control
valve and
place
your hand
on
the
air
hose outlet
to
check for
air
If
no
air is
felt
replace
the
air
control valve
4
Pull
vacuum
hose
off from
air
con
trol valve
If
discharge
of
air
from
air hose
stops
the air
con
trol
valve is
normaL If
discharge
is
still felt
replace
the valve
Plug
up the
removed
vacuum
hose
to
stabilize
engine running
EC312
Fig
EC 45
Checking
air control valve
Emarsancy
air rella
valve
E AR
Valve
lCalHornla
models
L
Warm up
engine
thoroughly
2
Before
checking
air
control valve
check all hoses for loose connection
leaks
etc
and
repair
or
correct
if
necessary
3
Race
engine
approximately
2 000 rpm under
no
load Place your
hand
on
air
outlet of E A R valve
to
check for presence of
discharged
air
If
no
air
is felt E
A
R valve
is
normal
4
Disconnect
vacuum
hose
from
B
A
R valve
as
shown
in
Figure
EC
46
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