ENGINE RUNNING RICH AND MECHANIC IS STUMPED?

1992 Lexus SC 400

Tiny

doylegroff

February, 29, 2012 AT 8:54 PM

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.

Save me !

FOUND 380 RELATED QUESTIONS

Runs Rich

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720 Running Rich

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1 Answer

Tiny

rasmataz

February, 29, 2012 AT 8:56 PM

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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