Nissan Silvia. Manual — part 127
SEF312N
INSPECTION
NMEC0019
EVAP Canister
NMEC0019S01
Check EVAP canister as follows:
1.
Blow air through port A orally. Make sure that there is no leak-
age.
2.
Apply vacuum to port A. Block port D. Blow air through port C
orally. Check that air flows freely through port B.
MEC744B
Fuel Check Valve
NMEC0019S11
1.
Blow air through connector on fuel tank side.
A considerable resistance should be felt and a portion of air
flow should be directed toward the EVAP canister side.
2.
Blow air through connector on EVAP canister side.
Air flow should be smoothly directed toward fuel tank side.
3.
If fuel check valve is suspected of not properly functioning in
steps 1 and 2 above, replace it.
SEF989X
SEF943S
Fuel Tank Vacuum Relief Valve (Built into fuel filler cap)
NMEC0019S03
1.
Wipe clean valve housing.
2.
Check valve opening pressure and vacuum.
Pressure:
15.3 - 20.0 kPa (0.156 - 0.204 kg/cm
2
, 2.22 - 2.90 psi)
Vacuum:
−6.0 to −3.4 kPa (−0.061 to −0.035 kg/cm
2
, −0.87 to
−0.50 psi)
3.
If out of specification, replace fuel filler cap as an assembly.
CAUTION:
Use only a genuine fuel filler cap as a replacement.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EC-23
EVAPORATIVE EMISSION LINE DRAWING
NMEC0020
SEC322C
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EC-24
Positive Crankcase Ventilation
DESCRIPTION
NMEC0021
SEF030Q
This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to con-
duct crankcase blow-by gas to the intake manifold.
During partial throttle operation of the engine, the intake manifold
sucks the blow-by gas through the PCV valve.
Normally, the capacity of the valve is sufficient to handle any
blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air inlet tubes into the
crankcase. In this process the air passes through the hose con-
necting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to
draw the blow-by flow through the valve. The flow goes through the
hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all
conditions.
SEC137A
INSPECTION
NMEC0022
PCV (Positive Crankcase Ventilation) Valve
NMEC0022S01
With engine running at idle, remove PCV valve from rocker cover;
if the valve is working properly, a hissing noise will be heard as air
passes through it and a strong vacuum should be felt immediately
when a finger is placed over valve inlet.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Positive Crankcase Ventilation
EC-25
ET277
PCV Valve Ventilation Hose
NMEC0022S02
1.
Check hoses and hose connections for leaks.
2.
Disconnect all hoses and clean with compressed air. If any
hose cannot be freed of obstructions, replace.
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Positive Crankcase Ventilation (Cont’d)
EC-26
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