From the few trucks that we have had in here one was a non modified excursion. It had no chip or program and ran half way descent except for no power. Just went down one day on customer and hole number 3 was missing. After a call to technical hotline we where told that for some unknown reason that #3 #5 where melting...thats all that i know...everything else like leaking injectors and stuck vgt solenoids is purely speculation. Make sure you keep your maintenece up and get a reprogram when u can. I really didnt mean to piss in anybodys post toasties on that first post of mine...Happy truckin dude and good luck