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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 7

Chart 7

Backfires

SYSTEM/COMPONENT REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE  ) unless noted 
Secondary Ignition For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC .
For all others, GO to PINPOINT TEST JB .
Fuel Delivery System Natural Gas Applications:
GO to B: Natural Gas Fuel Delivery System STEP HB1.
All Others:
GO to C: Fuel Delivery System STEP HC1.
Base Engine Engine System - Refer to the appropriate ENGINE article.
Exhaust System GO to F: Catalyst Efficiency Monitor and Exhaust Systems STEP HF5.
Additional Testing GO to Z: Intermittent STEP Z1.
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