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too much fuel

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Old Jun 18, 2010 | 09:00 PM
  #1  
donaldsz28's Avatar
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From: Greensburg
too much fuel

For some reason one of my 02 cencors read very rich and the other reads very lean. I out a new MAP cencor on it and it semed to help alittle. I have no clue whats going on. any clues?
Old Jun 18, 2010 | 10:02 PM
  #2  
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From: Hell was full so they sent me to NJ
Have you scanned if for codes?

How did you read the O2 sensor data? What did your scanner show? Was it in closed loop, with the sensor readings switching rapidly back and forth between rich and lean? If not, were the sensor readings stationary, with one at very low mV and the other at very high? If so, what were the readings? What was the engine operating condition - idle, part throttle, WOT?

Appears the engine is highly modified, but you haven't really provided much data. Intake valve size is interesting, but not very helpful in describing the mods. What heads? Who tuned it?

If you have a scanner, and can read the O2 sensors, you should also be able to access the long term fuel corrections? Are they equal, or are they also "split" in opposite directions?

What lead you to believe that changing the MAP sensor would somehow solve a problem with the O2 sensors?
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