KYMCO SR25BA - Evaporative Emission Control System Function

18. EVAPORATIVE / EMISSION CONTROL SYSTEM Movie S 125i
18-2
EVAPORATIVE EMISSION CONTROL SYSTEM FUNCTION
FOREWORD:
The Evaporative Emission Control System is abbreviated to E.E.C. System. This device collects
the fuel vapor from the fuel tank and then the fuel vapor is drawn into the engine for re-burning to
avoid air pollution caused by the fuel vapor diffused into the air.
FUNCTION
Item
Purpose Function
Pur
g
e Control Valve
Control va
p
orized HC
from fuel tank not to
diffuse into the air.
The charcoal canister absorbs va
p
orized HC
from the fuel tank. When the en
g
ine is
runnin
g
and the
p
ur
g
e control valve is o
p
en,
the fuel va
p
or in the charcoal canister is
drawn into the engine for re-burning.
Charcoal Canister
Absorb and store the
va
p
orized HC from the
fuel tank and carburetor.
The va
p
orized HC is absorbed in the
charcoal canister and the s
p
ecified volume
of HC in the emission should not exceed 2
g
.
P.C.V. System
Com
p
letel
y
recover the
HC from blow-b
y
g
as in
the crankcase for re-
burning.
Throu
g
h the P.C.V. s
y
stem, the blow-b
y
g
as
from the crankcase is se
p
arated into fuel
va
p
or and fuel and then drawn into the
cylinder for re-burning.
TROUBLESHOOTING
Engine loses power or runs erratic at idle speed
1. Clogged P.C.V. system
2. Clogged air cleaner
3. Faulty purge control valve
4. Loose or broken E.E.C. system tubes
Engine idles or accelerates roughly
1. Faulty fuel cut-off valve
2. Faulty purge control valve
3. Clogged or faulty charcoal canister