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Check for contaminated Mass Airflow (MAF) sensor. Check air intake system. Additional Intermittent Testing Go to TEST Z: INTERMITTENT , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX- VEHICLE FAILS EMISSIONS/EMISSIONS COMPLIANCE For emissions compliance procedures, see EMISSIONS COMPLIANCE under EMISSION SYSTEMS & HISSING SOUND WHEN REMOVING FUEL CAP For diagnostic procedures, see HISSING SOUND WHEN REMOVING FUEL CAP symptom under EXCESSIVE FUEL ODOR For diagnostic procedures, see EXCESSIVE FUEL ODOR symptom under SYSTEM TESTS UNABLE TO REFUEL VEHICLE For diagnostic procedures, see UNABLE TO REFUEL VEHICLE symptom under SYSTEM TESTS WARNING INDICATOR LIGHTS The following warning indicators may illuminate: z Malfunction Indicator Light (MIL) z Transmission Control Indicator Light (TCIL) z Shift Indicator Light (SIL) z Temperature Warning Indicator Light Or Gauge - Models With Cylinder Head Temperature (CHT) NOTE: If exhaust emission test fails and Malfunction Indicator Light (MIL) is on,
2003 Ford Pickup F150 2003 ENGINE PERFORMANCE Trouble Shooting - No Codes - CNG, Flex-Fuel & Gasoline
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