Question about 1999 Ford F350 Regular Cab

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Turbo problems on 99 Ford F550 7.3 PowerStroke

I have a 99 Ford F550 7.3 Powerstroke. Initial problem was problem of loss of power and black smoke after 20 minutes run time & engine misfire. Truck was at full operating temperature under load experiencing these problems. Ran diagnostic test with SnapOn MTG2500 color graphing scanner which showed 2 codes of P1212 - ICP Not at Expected & PO471 - Exhaust back pressure sensor circuit performance problem. Cleared codes, took back pressure sensor out - found clogged tube to sensor - clogged with carbon. Cleaned tube and sensor out. Test drove truck - had more loss of power and was throwing a code of PO1238 - turbo booster pressure signal loss or high or low. Does not have any power at all - booster not engaging.

Thanks for any input that anyone may have.
WillyP

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Check for vacuum hoses.

Posted on Jan 06, 2009

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