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1993 Buick Century

Tiny
PETEPROBINSON
  • MEMBER
  • 1993 BUICK CENTURY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 192,000 MILES
1993 Buick Century Custom 3.3L
Car runs rich, smells at tail pipe, ruff at idle; fuel mileage is at about 10MPG
Check engine light is not on but does work. Runs the same hot or cold.

1. New o2 Sensor
2. New Mass Air Sensor
3. New Engine Control Computer (used old PROM did not buy new one)
4. Shop performed BG injection cleaning

Fuel pump is relatively new.
Good plugs and wires
Checked all fuses.

Sick of throwing parts at this car.
Lost!
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Monday, June 15th, 2009 AT 1:54 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Typical symptoms of an engine that is running rich (too much fuel, not enough air) are poor fuel economy, elevated emissions (Carbon monoxide or CO), and engine may have rough idle or surge condition.

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Monday, June 15th, 2009 AT 3:09 PM

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