Diesel Engine - Buck/Surge on Light Acceleration
TSB 05-21-510/31/05
BUCK/JERK OR SURGE - 6.0L VEHICLES BUILT
BEFORE 8/22/2005
FORD:
2004-2005 Excursion
2004-2006 E-Series, F-Super Duty
ISSUE
Some 2004-2006 E-Series/F-Super Duty and 2004-2005 Excursion vehicles built before 8/22/2005 and equipped with a 6.0L diesel engine may exhibit various light surging concerns upon light acceleration from stop to 50 MPH (80 Km/h) typically on cold start, 1800 to 2800 RPM in drive or neutral, or under high load typically pulling a trailer and/or going up a grade (prolonged light surge). The concern normally occurs right before a transmission upshift event, or if transmission is held in gear where engine speed is steady 1800 to 2800 RPM.
ACTION
This concern may be caused by Variable Geometry Turbo (VGT) control valve contamination. PC/ED Section 5, Pinpoint Test KA: turbocharger system performance diagnosis has been revised to better diagnose these types of concerns. To diagnose, follow the online 2006 model year PC/ED diagnostics, section 5, Pinpoint Test KA. If the revised PC/ED diagnostics lead to VGT replacement, remove and replace the turbo oil supply tube assembly along with the VGT.
Parts Block
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
DEALER CODING
CONDITION
BASIC PART NO. CODE
9T516 42
OASIS CODES: 602500, 610000, 612000, 614000
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