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1993 Mazda 626 engine is running rich

Tiny
ERICFURNISS
  • MEMBER
  • 1993 MAZDA 626
Engine Performance problem
1993 Mazda 626 4 cyl Front Wheel Drive Automatic

what are the parts that makes my engine run rich and how do I check the parts
Sunday, August 15th, 2010 AT 12:18 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Probable causes of an engine running rich are as follows:

1. Excessive fuel pressure can be cause by restricted fuel return line or defective fuel pressure regulator.
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, August 15th, 2010 AT 10:37 PM

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