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failed smog, running rich, code 14, electronic control assembly, or o2 sensor?

Discussion in 'Computers, Chips & Tuning' started by nothinbutroad, August 4, 2018.

^^Searches ExplorerForum.com^^

  1. nothinbutroad

    nothinbutroad New Member

    April 29, 2012
    Likes Received:
    Trophy Points:
    City, State:
    Grand Terrace
    Year, Model & Trim Level:
    1991 ford explorer
    So I have a 91 Explorer that just failed smog because it was running rich. about 7 years ago I had the same problem, I changed out several sensors on the truck, and the 1 that finally passed it was the O2 sensor.

    This time around I ran my scanner on it, KEY ON ENGINE OFF I got a code 14 the electronic control assembly "has detected an intermittent loss of profile ignition pick up signal during recent operation" and during the KEY ON ENGINE RUNNING test i got a code 11 which is system pass.

    Can the ECA/ECM make the vehicle run rich? or does it send a signal saying its running rich? or does it send a signal to the 02 sensor making it run rich, or making it read that it is running rich?

    should I simply replace the ECA/ECM since that is the only code given?

    since the O2 sensor was the problem last time should I replace that? or since both could be the issue should I just replace both?

    why would the car run rich and fail smog but get a passing code with the engine running? shouldn't it give a code that it is running rich?
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