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1997 Chevy Blazer Black smoke from engine

Tiny
CATITUDE77
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 134,000 MILES
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?
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Tuesday, January 15th, 2008 AT 8:49 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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Wednesday, January 16th, 2008 AT 4:42 AM

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