1993 LEXUS ES300 FUEL /EXHAUST SYSTEM TROUBLESHOOTING

  • Tiny
  • steveme
  • 1992 Lexus ES 300
  • 6 CYL
  • FWD
  • automatic
  • 160 miles

Daughter's '92 Lexus ES300 has recently begun idyling rough (coughing between approx..75 and 1.2 - 5 rpm). The fuel exhaust fumes are white, emitting a lingering - but not thick - cloud from the pipe with a rich smell of gasoline.
I do not see leaking fuel lines or disconnected vacuum hoses under the hood.
Any ideas where to look for problem?

thx,
Steve

Tuesday, May 24th, 2011 AT 7:15 PM

1 Answer

  • Tiny
  • rasmataz
  • Member

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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Wednesday, May 25th, 2011 AT 5:20 AM

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