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Asking this for a friend. The truck yesterday was coming down the highway and blowing white smoke, then as if nothing had happened it cleared up and was fine. Then when coming over the highway at a stop light the turbo started building boost and the truck was surging. Any ideas what it could be causing these things. Thanks
 

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what year truck?? what after market mods, chip/tunner, how many miles?? :popcorn: have you cheked for codes?? probable causes- charge air cooler restrictions/bad fuel quality\ an out of range sensor/coolant leak/faulty injector/bad compression in a cylinder\bad injector seat cup-ect-ect.
 

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Was there a knocking noise of any kind that went along with it? Did it register boost on the gauge or did it just sound like it was makeing boost?
 
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