Here's a company in Atlanta, GA that works on these diesel engines and he has some very good information that you may want to be aware of.....peruse a few of his videos...
And, if you're having problems, you may want to contact him.....I found his advice very enlightening...
PowerstrokeHELP.com
Quote:
STOP SEARCHING... Let The Experts That Know Powerstroke's Repair Your Truck!
http://powerstrokehelp.com/
Master Mechanic Video Repair Training Series
Grand Tour...
http://mastermechanic.powerstrokehelp.com/tour/
Test Video:
http://mastermechanic.powerstrokehelp.com/tour/high/video1.html
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Video links:
http://www.youtube.com/user/powerstrokehelp
Videos:
http://www.youtube.com/user/powerstrokehelp/videos
Check these as an examples:
FREE FUEL ECONOMY TIPS
$5 PART WILL SAVE YOUR POWERSTROKE FROM SELF DESTRUCTION