Evaporative Emission Control System Function; Engine Loses Power Or Runs Erratic At Idle Speed; Engine Idles Or Accelerates Roughly - KYMCO Movie S 125i Service Manual

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EVAPORATIVE / EMISSION CONTROL SYSTEM

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
Purge Control Valve
Charcoal Canister
P.C.V. System
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
Purpose
Control vaporized
from fuel tank not to
diffuse into the air.
Absorb and store
vaporized HC from the
fuel tank and carburetor.
Completely recover
HC from blow-by gas in
the crankcase for
burning.
The charcoal canister absorbs vaporized HC
HC from the fuel tank. When the engine is
running and the purge control valve is open,
the fuel vapor in the charcoal canister is
drawn into the engine for re-burning.
the The vaporized HC is absorbed in the
charcoal canister and the specified volume
of HC in the emission should not exceed 2g.
the Through the P.C.V. system, the blow-by gas
from the crankcase is separated into fuel
re- vapor and fuel and then drawn into the
cylinder for re-burning.
Movie S 125i
Function
18-2