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EXHAUST SYSTEMS under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & z Check EVAP emission system for blockages (engine stalls) or leaks (excessive fuel odor). See SYSTEM z Check PCV system. See TEST HG: PCV SYSTEM under SYSTEM TESTS in SELF-DIAGNOSTICS - z Check starting system. See appropriate STARTERS article in ENGINES. z Visually inspect Mass Air Flow (MAF) sensor for contamination. z If no concern is found, check for intermittent faults. See TEST Z: INTERMITTENT under SYSTEM NO START/NORMAL CRANK - ALT FUEL MODE z If ALT fuel switch indicator is on then goes off, see TEST AC: NO START/HARD START IN ALT z If ALT fuel switch indicator is always on, see TEST AD: NO START - ALT FUEL SWITCH z If ALT fuel switch indicator is always off, see TEST AE: NO START - ALT FUEL SWITCH z If engine is still a no-start after completing previous tests, see TEST KE: IDLE AIR CONTROL z Check engine mechanical condition. Check compression, camshaft, valve train components, etc. and NO START/NORMAL CRANK - GASOLINE MODE z Check fuel system. See TEST AB: NO START - GASOLINE under SYSTEM TESTS in SELF- CAUTION: Extended cranking due to a no-start condition, can load exhaust system with raw fuel, which may ruin catalytic converter after engine is started. NOTE: If ALT fuel switch indicator illuminates and then goes off, vehicle may switch CAUTION: Extended cranking, due to a no-start condition, can load exhaust system with raw fuel, which may ruin catalytic converter after engine is started.
2003 Ford Pickup F150 2003 ENGINE PERFORMANCE Trouble Shooting - No Codes - Bi-Fuel - Gasoline/CNG
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