2004 Ford F150 4.6 L rough on startup

2004 FORD F-150
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DCHEEKS
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Engine Performance problem
2004 Ford F150 V8 Four Wheel Drive Automatic

Vehicle is rough on first startup for the day. upon acceleration a puff of black smoke is visible from exhaust. No code shown when hooked to diagnostic computer
Jul 2, 2009 at 7:18 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
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Running rich:

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
Jul 2, 2009 at 7:38 PM
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