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boboaks

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Posts posted by boboaks

  3. Posted · Report reply

    On 8/14/2017 at 0:28 PM, DickandLois said:

    The reason you can get the engine out of limp mode when you disconnect the battery is the ECM memory is erased and the engine needs to run for a period of time for the ECM to read all the sensor information and if the 02 sensor voltage is out of range or the MAP sensor is not reading the proper air flow - it will go into limp mode > the MAP - Mass Air Flow sensor tells the ECM what the fuel mixture for the load should be - So if the fuel mix is rich or lean the engine will go into limp mode. This is to protect the engine from serious damage if the mixture is to lean, one can damage the pistons and valves.

    Rich.

    What codes does the garage or someone else get from your ECM ? 

     

    On 8/14/2017 at 2:59 PM, boboaks said:

    Thanks to you all. I am changing O2 and mass air sensors. Will check plugs and will update.

    I changed O2 and mass air sensor and have not had any issues since.

  7. Posted · Report reply

    I have 2003 Mountain Aire with GM8.1 Workhorse engine. The check engine light comes on and the coach goes into limp mode immediately. Scan shows heated oxygen sensor. Surprised that it goes into limp mode for sensor. Has anyone seen something similar? I can disconnect and reconnect battery and it will run fine for sometimes 40 miles or 200 miles before it happens again.

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