89 F250 5.8L code 41 EGO lean

1989 FORD F-250
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SHADETREEMECH
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Pulled a code with my new handy dandy code reader. Code 41 indicates "Exhaust Gas Oxygen sensor: voltage signal always "lean" (low value) does not switch."

The terms "always" and "does not switch" refer to the condition does not change when the engine is rev'ed.

So, do I have a bad sensor or a lean condition that the sensor has correctly identified? At $45.00 for a new sensor I didn't want to try a sensor.

How do I approach a lean condition?

Thanks

John
Jun 27, 2007 at 12:19 PM
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BRUCE HUNT
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
Take a couple of minutes and shoot the timing gun at the truck.
Jun 27, 2007 at 2:23 PM
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SHADETREEMECH
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Attempted to check the timing...

The pointer bracket has both a pointer and a circle with no indicators for degrees. I didn't see any marks for degrees on the wheel.

Is TDC with the mark in the circle or at the pointer?
Where are the degree indicators?

Thanks,

John
Jun 27, 2007 at 4:01 PM
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