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1997 Ford Thunderbird engine burning rich

Tiny
MANNYCATHERS
  • MEMBER
  • 1997 FORD THUNDERBIRD
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 19,008 MILES
I have a 3.8 the intake airflo sensor has been changed and all four oxygen sensors have been changed but it is still running rich and runs rough at idle blowing black smoke from tail exaust pipe. The cooling fan also comes on at cold start like maybe the
fan sensor or something is telling the fan to come on.
if I could wait for my ssi check to get here I would be able to donate but as of now I need a running car so I will have to go for the free question for now. Thank you for your help.
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Tuesday, June 1st, 2010 AT 7:43 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Probable causes of an engine running rich are as follows:

1. Fuel pressure not within specs. Can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Saturday, June 5th, 2010 AT 3:19 AM

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