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Need some info - advance, fuel trims

Discussion in 'Stock 1995 - 2001 Explorers' started by SoNic67, June 24, 2011.

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    1. SoNic67

      SoNic67 Well-Known Member

      Joined:
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      City, State:
      Newport News, VA
      Year, Model & Trim Level:
      2001 V8 (Eddie Bauer) AWD
      Engine: V8, 5.0L, 2001. I have monitored the OBDII readings from my engine and I am puzzled.
      Does anybody have a OBDII scanner that can provide some comparations?

      1. Timing Advance. At idle is some 20%, at moderate load and 1000rpm is 30%, cruising on highway at 1800-1900rpm is 40%. Is that reading wrong?
      2. My long term fuel trims are some 17 and 18%. What can cause that - incorrect readings of MAF sensor, precat O2 sensors? Both MAF and O2 are "working" based on the readings, but I don't know if they are accurate.
      3. Throttle doesn't drop below some 18% at idle. Is that the IAC valve influence or is a bad reading?
       
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    3. SoNic67

      SoNic67 Well-Known Member

      Joined:
      January 24, 2010
      Messages:
      3,054
      Likes Received:
      11
      Trophy Points:
      48
      City, State:
      Newport News, VA
      Year, Model & Trim Level:
      2001 V8 (Eddie Bauer) AWD
      Well, looking in this table looks like 40deg is not so crazy after all:
      [​IMG]
       

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