2001 Ford Mustang

Tiny
LADYDON
  • MEMBER
  • 2001 FORD MUSTANG
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 138,000 MILES
I have black comeing from the tail pipe
Monday, October 25th, 2010 AT 12:21 PM

1 Reply

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

1. Excessive fuel pressure can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Monday, October 25th, 2010 AT 12:49 PM

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