[V8] The continuing saga of the check engine light (93 4.2)

[Carter Johnson]

So, after blindly assuming that the check engine light had something to do with the oil level, that appears to be more of a coincidence than anything else - a strange coincidence, but a coincidence none the less.  The light was back on in force today as milage once again plummeted into the teens despite a recent oil change and full level.  SOOOOOOO
   
  Off to the mechanic.  Checked the code - oxygen sensor regulator, and oxygen sensor out of maximum adjustment (or something to that effect...).  Mech thinks full pressure regulator sticking open, causing enrichment and oxygen sensor unable to cope.  Ok, intake comes off and waaaaalaaaaaaa - one of the problems - the return  fuel line is leaking (driver's back to passenger bank, the lower hose).  So we pull all that appart and test the fuel pressure - dead on 50.5lbs at idle, 58-59 at WOT.  Ok, so that's in spec.  Replace the line, and light goes off.  It's stayed off for the time being, but he's pretty sure that leaking line was NOT the cause of the CEL.  
   
  Stumped again.  Still thinking O2 sensor?  Why am I smelling raw fuel prior to the light coming on then, and the sensor is attempting to correct the problem?
   
  Carter


W. Carter Johnson
SileStone/Counterfitt of RI
401-789-3217 home
		
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