1990 Ford Mustang blacksoot

1990 FORD MUSTANG
99,000 MILES • 6 CYL • 2WD • AUTOMATIC
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EDDIE24
  • MEMBER
  • 1 POST
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
Apr 11, 2010 at 9:33 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
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.
Apr 11, 2010 at 11:44 PM
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BLUEOVALPOWER50
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  • 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
May 7, 2010 at 2:39 PM
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