1992 Lexus ES 300 Repair Question
1993 Lexus ES300 fuel /exhaust system troubleshooting
I do not see leaking fuel lines or disconnected vacuum hoses under the hood.
Any ideas where to look for problem?
Probable causes of an engine running rich are as follows:
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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