4. FUEL SYSTEM
4-3
TROUBLE DIAGNOSIS
Poor engine start
z No fuel in fuel tank
z Clogged fuel tube
z Too much fuel in cylinder
z No spark from spark plug(malfunction of ignition system)
z Clogged air cleaner
z Malfunction of auto by-starter
z Malfunction of throttle operation
z Malfunction of purge control valve
Stall after started
z Malfunction of auto by-starter
z Incorrect ignition timing
z Malfunction of carburetor
z Dirty engine oil
z Air existing in intake system
z Incorrect idle speed
z Malfunction of purge control valve
Rough idle
z Malfunction of ignition system
z Incorrect idle speed
z Malfunction of carburetor
z Dirty fuel
Intermittently misfire as acceleration
z Malfunction of ignition system
Late ignition timing
z Malfunction of ignition system
z Malfunction of carburetor
Power insufficiency and fuel consuming
z Fuel system clogged
z Malfunction of ignition system
Mixture too lean
z Clogged fuel injector
z Vacuum piston stick and closed
z Malfunction of float valve
z Fuel level too low in float chamber
z Clogged fuel tank cap vent
z Clogged fuel filter
z Obstructed fuel pipe
z Clogged air vent hose
z Air existing in intake system
Mixture too rich
z Clogged air injector
z Malfunction of float valve
z Fuel level too high in float chamber
z Malfunction of auto by-starter
z Dirty air cleaner
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