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P0471 Diagnostic Trouble Code Discussion for November 2009

Exhaust Backpressure Circuit Range/Performance

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Trouble Ticket Help Requests for DTC P0471
Help Request Posted
2000 Ford F-550 Super Duty XL 7.3L Excessive Emissions, Hesitation, Cuts out, Misfire, Poor Fuel Economy VIN: 1FDAW56F41
P0471: Exhaust Backpressure Circuit Range/Performance. This is where it gets fun. Truck came in fuel locked. Cleared cyls and found cut oring on the inj they replaced. Replaced o-ring. That solved the black smoke and fuel locked problem, but not the power issue. Engine cuts out and sort of pops at RPMs above 2500....
November 22, 2009