Question about 1999 Ford Expedition

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Miss firing codes 303 and 308 persist after coil replacement..... Possible wiring issue or is there a ignition control module that will cause this issue???

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  • yadayada
    yadayada Oct 08, 2010

    why do u think that a coil is the solution, it is one of about 10 things that can cause the misfire

  • deconyers Oct 08, 2010

    Ok now that I have had the Ford for awhile I have come across two other codes that come up first, a P0171 and P0174 lean conditions on both banks, putting them together means a lean misfire. Coils wont be the issue , the MAF sensor has been replaced in the last six months, and do not have the proper scan tool to check short and long term fuel trim, at this point im at a loss of how I should go about pin pointing this issue any advice will be helpful thanks

  • deconyers Oct 08, 2010

    Ok after having the ford for awhile I have found that codes P0171 and P0174 fault out first leading me to beleive the misfiring is coming from a lean condition, MAF sensor has been replaced within the last six months. With out the proper scan tool to see Short and long term fuel trim I am at a loss of how to pin point the actual issue here. Anything will be helpful thanks ..

  • deconyers Oct 08, 2010

    I did check for leaks and did not find any, went ahead and checked the freeze frame data off my reader it seems to me the fuel trim is high percentage,
    Short term Bank 1 23.44 % Eng Load 39%
    Long term bank 1 25.00% Eng RPM 656
    ST B2 22.66%
    LT B2 25.00%
    Any more ideas? am I back at the MAF sensor?

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  • Ford Master
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Check for engine vacuum leaks (common cause of lean O2 codes) around the intake, use a bottle of propane with a hose spray around the whole intake, all vacuum lines etc. if the idle speed changes u have a leak. Let me know what u find. Also clear the codes u have.

Posted on Oct 08, 2010

  • Anonymous Oct 09, 2010

    When you get done with the possible vacuum leaks

    You can go back to the bad coils,you don't get two PO300 Codes and no bad coils

    I doubt you have two coils bad,I wouldn't count on Cylinders 3

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  • Master
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Hello,

There must have been a problem with the wiring of the car.
Have it carefully rewired and the problem would be solved.

Take care

Posted on Oct 08, 2010

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