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restrictions. If restrictions are present and are unable to be removed, replace exhaust manifold. Perform 13) Check Manifold Vacuum With Muffler & Tailpipe Assembly Disconnected DRIVE CYCLES . Ensure CATALYST MONITOR PROCEDURE is performed to verify repair. If manifold vacuum is still not okay, fault is in TEST HG: PCV SYSTEM Diagnostic Aids This test is performed when directed here from one of the following symptoms in TROUBLE SHOOTING - z Rough Or Rolling Idle, Stalls, Misses, Hesitation Or Surge z Hard Start/Long Crank Or Erratic Start/Crank z Slow Return To Idle z Spark Knock z Poor Fuel Economy z High Oil Consumption z Exhaust Smoke Use this test to diagnose Positive Crankcase Ventilation (PCV) valve and related vacuum hoses. Testing 1) Check Power And Ground Circuits At Heated PCV Valve 2) Check Resistance Of Heated PCV Valve NOTE: After each service or repair procedure has been completed, reconnect all
2003 Ford Pickup F150 2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline
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