Question about 1998 Ford Expedition

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Runs rough when cruising at 35-40 mph

I recently took my 1998 Expedition in for repair of intermittent loss of power while cruising at high speeds (interstate travel) - the fix-replaced Mass Air Flow Sensor, this also cleared up the check engine light that had been illuminated for years. Now the truck runs rough when cruising at 35-40 mph (this problem did not exist until the mass air flow sensor was replaced).

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Try pulling off the air breather hose and look inside at the mass air flow sensor,it looks like a wire with a diode hooked to it incase you didnt know,see if there is any fuzz on it,sometimes the air filter will lose small pieces and the mass air flow sensor catches it.If that doesnt work then you may have a fuel problem,weak pressure,causing the mass air flow sensor to read too much air so it tricks the computer to adjust the issue.

Posted on May 21, 2009

  • scott May 21, 2009

    try pulling off the air breather hose and look inside at the mass air flow sensor,it looks like a wire with a diode hooked to it incase you didnt know,see if there is any fuzz on it,sometimes the air filter will lose small pieces and the mass air flow sensor catches it.If that doesnt work then you may have a fuel problem,weak pressure,causing the mass air flow sensor to read too much air so it tricks the computer to adjust the issue.

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