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2004 Ford F-150 4.6 L rough on startup

Tiny
DCHEEKS
  • MEMBER
  • 2004 FORD F-150
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
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Thursday, July 2nd, 2009 AT 7:18 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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Thursday, July 2nd, 2009 AT 7:38 PM

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