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22. FUEL INJECTION SYSTEM MXU 500i
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
· Pinched or clogged fuel hose
· Clogged fuel injector · Faulty fuel injector
· Faulty spark plug or wrong type
· Clogged Airflow Bypass Valve
· Wet spark plug
Engine stall, hard to start, rough idling
· Intake air leak
· Fuel contaminated/deteriorated
· Pinched or clogged fuel hose
· Idle speed miss adjusted
· Wet spark plug
22-8