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z Check Idle Air Control (IAC) system. Go to TEST KE: IDLE AIR CONTROL VALVE , step 1) under Additional Intermittent Testing Go to TEST Z: INTERMITTENT , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX- NO-START/NORMAL CRANK After repairing a no-start condition on models with electric Secondary Air Injection (AIR) system, disconnect Preliminary Checks Check Inertia Fuel Shutoff (IFS) switch. Check fuel pressure and quality (octane, winter/summer grade fuel, Miscellaneous Component Or System Checks Check the following: z Check fuel and ignition systems. Go to TEST KB: FUEL PUMP DRIVER MODULE , step 85) (LS z Check exhaust system for restriction. Go to TEST HF: CATALYST EFFICIENCY MONITOR & z Check engine mechanical condition. Check compression, camshaft, valve train components, etc. See Engine Will Now Start & Run Normally At Part Throttle If engine starts and runs only at part throttle, check Idle Air Control (IAC) system. Go to TEST KE: IDLE Additional Intermittent Testing CAUTION: Extended cranking, due to a no-start condition, can load exhaust system with raw fuel, which can damage catalytic converter after engine is started.
2003 Ford Pickup F150 2003 ENGINE PERFORMANCE Trouble Shooting - No Codes - CNG, Flex-Fuel & Gasoline
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