Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2004ECONOLINE E150, VAN CARGO, 4.6 WREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYMPTOM CHARTS - CNG, FLEX-FUEL & GASOLINESTEP 3: NO DTC(S) PRESENT SYMPTOM CHARTSCHART 9
2004 Ford Econoline E150, Van Cargo, 4.6 W
Chart 9
2004 Ford Econoline E150, Van Cargo, 4.6 WSECTION Chart 9
Spark Knock
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted |
|---|---|
| Verify engine operates at normal temperature | Visual (refer to STEP 2: NO DTC(S) PRESENT SYMPTOM CHART INDEX or the appropriate ENGINE COOLING article, to diagnose any cooling system concerns that are present). |
| Verify correct coolant level and coolant concentration | Refer to the appropriate ENGINE COOLING article for proper fill concentrations and fill procedures. |
| Mass Air Flow (MAF) Sensor | GO to C: Mass Air Flow Sensor STEP DC25. |
| Base Engine | Engine System - Refer to the appropriate ENGINE article. |
| 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. |
| Secondary Ignition System | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC
. For all others, GO to PINPOINT TEST JB . |
| PCV System | GO to G: Positive Crankcase Ventilation (PCV) System STEP HG1. |
| Engine Oil Quality | Visual |
| Additional Testing | GO to Z: Intermittent STEP Z1. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.