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Re: 2003 Ford Explorer Sport XLT 4.0L w/ P0171
Posted to Technical Discussion Forum on 5/30/2014 1 Reply

Hi Shannon, here's whats going through my mind after reviewing the data.

I believe we can almost certainly rule out a vacuum leak due to the fact that the fuel trims are higher as RPM/throttle angle increases. The fact that your o2 sensors indicate rich when... Login to read more.

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