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Old 03-01-2009, 11:52 AM   #8 (permalink)
OMCUSNR
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Join Date: Dec 2003
Location: Medford, Oregon
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Quote:
Originally Posted by foots View Post
Yes Duncan its only at idle....and you would think that the 3 Diesel tech's and 3 Ford Field service techs that have come out and worked on this might have tried or thought of it....but I will bring it up to them as its going back in to the shop monday AM.....

it pulls fine has pleanty of power , and gets good gas mpg....when you come to a stop at a Stoplight or park the truck ...in a aprox 1-2 min it will start...the idle goes from 750 down to 500 then up to 1000 then back down to 750....and it will keep doing that for approx 5-8 min..then it will go away...
What oil are you using, and how much is in it? The 6.0 seems to be a bit sensitive to oil. If its overfull, this can froth the oil and cause surging when the froth hits the HPOP. I have heard that some guys have had problems switching between oils and the truck not appreciating it. Have you (or the dealer) pullled an OA to see what fuel dilution looks like? There was a time when the 6.0 was known for "making oil" with leaking injectors. If you're up over 3% fuel dilution this may be causing you to surge.

OMC
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Feb 03 6.0 Silver F-250 SD SC XLT long box, 6-spd 3.73ls, Fx4, Stock, Spray-in liner, Contico box.HARPOONED.
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