Join Date: Jun 2009
Location: Spring, TX
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Periodic Lack of Boost
A few addtional observations when my F250 fails to provide boost:
...it is usually when the engine is cold
...is more likely to occur when the truck has not been driven for several days
...occurs immediately after engine start
...corrects itself once the coolant temp has warmed up to approximately 120F
...you can hear the "bypass condition" slowly subside over about 5 seconds after warmed up as the variable vane opens allowing airflow into the turbo
...truck perfoms great once all the above occurs, and makes normal boost pressures up to nearly 40 psi under heavy acceleration.
Another wierd observation is these conditions do not always occur, but rather only about 70% of the time regardless of conditions. On some occasions, the truck will not have been used for 10 days, the enigne is cold, the ambient is low, but starts great and immediatley provides boost with no unusal sounds or mis-behavior.
Not sure if this is of any help but wanted to be clear on what I have experence in regard to noise and low power issues.
2009 F-250 6.4L, 275/65-R20's, Crew Cab, Short Bed, Tri-Fold Tonneau, Centramatics, AirLift Load Lifters and WirelessAIR, BushPilot's Block Heater and 12VDC Charging Mods, ATTA Undercover Fuel Tank & Toolbox, EDGE Evolution CS.