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Black smoke comes out of the exhaust pipe car does not run ok

Tiny
NABILALMASRI
  • MEMBER
  • 1989 VOLVO 780
  • 1 MILES
My car does not accelarate properly, and when I press the gas black smoke comes out of the exhust pipe.
Sunday, November 20th, 2011 AT 9:22 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Its running too rich could be caused by one of the following:

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.
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Sunday, November 20th, 2011 AT 4:40 PM
Tiny
NABILALMASRI
  • MEMBER
  • 16 POSTS
Hell this is nabil. Can you please tell me how the coolant temp sensor is calibrated on this volvo since it maight be the issue this problem accured after I replaced the water pump.
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Monday, November 21st, 2011 AT 4:34 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the sensor's resistances Hot and Cold if its not within specs-replace it
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Monday, November 21st, 2011 AT 6:27 PM

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