ENGINE RUNNING RICH AND MECHANIC IS STUMPED?

  • Tiny
  • doylegroff
  • 1992 Lexus SC 400
  • 13,300 miles

I have a 1992 lexus sc 400. It is running rich, can smell gas and gas gauge confirms it is using extreme amount of gas. It has had a major tune up, new catalytic converters, O2 sensors, and rebuilt ECM, and transmission flush. Still same problem.

Have had two mechanics on this and hand held analysis done. Still, no answers.

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Wednesday, February 29th, 2012 AT 8:54 PM

1 Reply

  • Tiny
  • rasmataz
  • Member

Could be one of the following below

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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Wednesday, February 29th, 2012 AT 8:56 PM

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