Engine Fail To Start; Backfiring Or Misfiring During Acceleration; Engine Stall, Hard To Start, Rough Idling; Poor Performance (Drive Ability) And Poor Fuel Economy - KYMCO XCITING S 400 Manual

6.Fuel System
XCITING S 400

TROUBLESHOOTING

Engine fail to start

• Intake manifold air leak
• Fuel contaminated/deteriorated
• Pinched or clogged fuel hose
• Faulty fuel pump
• Clogged fuel filter, throttle body
• Sticking fuel injector needle
• Faulty fuel pump operating system
• Carbon deposit stayed on the fuel injector
• Spark plug dirty
• Fuel pressure incorrect

Backfiring or misfiring during acceleration

• Ignition system malfunction

Engine stall, hard to start, rough idling

• Intake air leak
• Fuel contaminated/deteriorated
• Pinched or clogged fuel hose
• Idle speed fail to adjust
• Fail to perform TPS/ISC reset

Poor performance (drive ability) and poor fuel economy

• Pinched or clogged fuel hose
• Faulty injector
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