5. Fi INJECTION SYSTEM MOVIE S 125i
5-4
TROUBLESHOOTING
Engine won’t start Backfiring or misfiring during acceleration
• Battery voltage too low • Ignition system malfunction
• Fuel level too low
• Pinched or clogged fuel hose Poor performance (drive ability) and poor
• Faulty fuel pump operating system fuel economy
• Clogged fuel filter (fuel pump) • Pinched or clogged fuel hose
• Clogged fuel injector • Faulty fuel injector
• Faulty spark plug or wrong type
• Cut by ECU due to angle detect sensor or incorrect function
Engine stall, hard to start, rough idling
• Intake air leak
• Fuel contaminated/deteriorated
• Pinched or clogged fuel hose
• Idle speed misadjusted
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