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1997 4.6 v8 ford expedition runs rough and check engine light is on what is causing the problem

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  • Ford Master
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You can get a free scan at Autozone or Oreillys. There are many things it can be, but the diagnostic system in your vehicle will identify the part or group that is malfunctioning.

One thing you can check is the intake manifold directly under the Airhorn. Usually this will show a "insufficent EGR flow" and Code 401. There is a groove beneath the gasket that needs cleaning. Its 8 bolts and a $10 gasket to fix. The diagnostic computer misses the real problem and blames parts for not opening instead of being plugged. It can be other things too, so have the scan anyway.

Posted on Apr 28, 2010

  • svore2 Sep 24, 2010

    Please be awear I took my 97 Explorer to Autozone with a check engine light on they told me it was the mass air flow sensor so I spent $100 bucks on it 2 days later the light came back on, thinking I had another problem I went back to Autozone they told me it was the M.A.F. again when I confronted them they then admitted there are 6 sensors with that code. I took it to a dealer and paid for a diagnostic only to find it was a leaking intake manifold gasket all along.

  • fordexpert Sep 24, 2010

    Thank You for passing the Resolution along. I called a Zone office for Autozone about your misdiagnosis. Call this number, 586-463-4833. The person at this location needs to know the store you went to. The Autozone stores have Regional Customer centers and you need to deal with the Regional center that oversees your local store. The 586 number is MY Regional center and it is for Detroit; the person at this Regional center will give you the correct number for your area.

    I spoke with the Representative about your purchase of a part you did not need and a Dealer receipt for the corrective diagnosis. It seems the Regional centers will listen and you have a chance for getting something back. I personally have seen a local store price match a part that was 50% cheaper somewhere else. Please pursue this and let me know the outcome.

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