Join Date: Jan 2006
Location: central coast, california
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honestly the majority of turbo failures i see are due to carbon in the turbo vaine system that actually allows the vains to open and close more. some just fail, and there is nothing you can do to prevent or predict it. Most i replace are actually on soccer mom excursions and old guy superduties that dont get on the throttle enough. these motors need to get opened up every once in a while and driving them really easy is actually tougher on the motor as a whole than driving it at a "medium level" most of the time and then sometimes driving it like you stole it just to run the carbon out and keep it clean. the turbo system is the biggest benifactor of doing this.
i honestly have only replaced two VGT's that actually fixed a problem. i have, under the instruction of ford tech hotline, replaced many VGT's.....but i came to the conclusion long ago that it is rare that they actually are the problem. odds are when you tapped on the VGT, you actually freed up some of the carbon in that turbo and that is why it came back slightly for a short period of time............Marc