1997 Chevy Blazer Black smoke from engine

1997 CHEVROLET BLAZER
134,000 MILES • 6 CYL • 4WD • AUTOMATIC
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CATITUDE77
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  • 1 POST
Recently had the engine replaced with a newer one - it has 75000 miles on it. Was told that it was running great now. Problem is, it is not. Black smoke is coming from the tailpipe, it is missing while in park or drive, it is shaking. The most recent issue is black smoke coming from the back of the engine. Any suggestions with what could be wrong?
Jan 15, 2008 at 8:49 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
1st place to start is to have the fuel pressure check-the black smoke comes from an imbalanced air and fuel mixture that's always on the rich side of the stoichimetry 14.7:1 ratio

Possible areas: Fuel Pump/Pressure Regulator/02 sensor/Coolant Temp. sensor/Injector/s.
Jan 16, 2008 at 4:42 AM
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