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Home >> Ford >> 2004 >> Excursion 6.8 S, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Symptom Charts - CNG, Flex-Fuel & Gasoline >> Step 3: No DTC(s) Present Symptom Charts >> Chart 4

Chart 4

Unique Idle Concerns:

SYSTEM/COMPONENT REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE  ) unless noted 
Vacuum Leaks, Throttle Body Visual
PCV System GO to G: Positive Crankcase Ventilation (PCV) System STEP HG1.
Intake Air System (air leaks) GO to U: Intake Air Systems STEP HU1.