1992 Lexus SC 400 Repair Question
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.
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.
68 questions asked