Sym Citycom.300i, Service Manual

Page: 19 / 270

1. GENERAL INFORMATION
1-14
C. Engine runs sluggish (especially in low speed and idling)
D. Engine runs sluggish (High speed)
Check and adjustment Fault condition Probable causes
Check ignition timing
(using ignition lamp)
Normal
Abnormal
1. damage the insulator gasket.
2. Throttle body wrongly attached
3. Inlet pipe gasket abnormal
4. ABV pipe cracked
Have not sucked the air
Suck the air
The gasket of the throttle
body has air to suck or not
Good spark Poor
Remove spark plug, install
spark plug into spark plug
cap and perform spark test
against engine ground
Check the fuel pump supply
situation
good poor
Normal Clogged
1. change the fuel injector
Incorrect ignition timing (malfunction of ECU or
AC generator)
Spark plug fouled
Malfunction of E.C.U.
Malfunction of AC generator
Malfunction of ignition coil
Open or short circuit in spark plug leads
Malfunction of main switch
Check ignition timing
Check and adjustment Fault condition Probable causes
Normal Abnormal
Malfunction of ECU.
Malfunction of AC generator
Insufficient fuel in fuel tank
Fuel filter clogged
Restricted fuel tank vent
Check if fuel injector clogged
To this chapter contents