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P0471 Diagnostic Trouble Code Discussion for June 2014

Exhaust Backpressure Circuit Range/Performance

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Trouble Ticket Help Requests for DTC P0471
Help Request Posted
1999 Ford Econoline Super Duty Custom 7.3L MIL Lamp on VIN: 1FDXE40F2X
P0471: Exhaust Backpressure Circuit Range/Performance. The check engine light goes on and off and the bus runs rough and lacks power. when it warms up it runs a little better but not good. It also smokes blue on acceleration when it is warm. The The engine cranks well and evenly. I am leaning toward #3 and #5 inje...
June 04, 2014