new rebuilt engine is black smoking

1985 CHEVROLET ASTRO
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ADDIE
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engine brought in from the USA and installed on van.Is working well except it is black smoking at idle and worse when accelerated.service engine soon light on even before the other was put in.diagnostic SHOWING low TPS SENSOR.NEED ANYONE HELP BADLY.
MANY THANKS.
Mar 20, 2012 at 11:51 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Black smoke indicates too rich of an A/F mixture

Probable causes of an engine running rich are as follows:

1.Excessive fuel pressure can be cause by restricted fuel return line

2.Defective Oxygen Sensors.

3.Leaking injectors and fuel pressure regulator.

4.Coolant temperature sensor out of calibration.

5.Restricted air intake system.
Mar 20, 2012 at 11:59 PM
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