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1990 Ford Mustang blacksoot

Tiny
EDDIE24
  • MEMBER
  • 1990 FORD MUSTANG
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 99,000 MILES
There is black soot coming out of the muffler and there is a slight putter sound when its in park and if I rev the engine it also has a slight putter as the rpms drop and the rpms drops slighty under the idle point then stablize
Sunday, April 11th, 2010 AT 9:33 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Running rich:

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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Sunday, April 11th, 2010 AT 11:44 PM
Tiny
BLUEOVALPOWER50
  • MEMBER
  • 10 POSTS
Possible vaccum leak would be my educated guess, it should have thrown a cel for running rich? The ect sensor, o2 sensor, maf sensor are the major sensors that control the a/f ratio
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Friday, May 7th, 2010 AT 2:39 PM

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