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Old 01-19-2014, 05:21 PM
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oil around boost tubes

I have 01 F350 all stock with a 180k, and I started loosing mpg awhile ago, im at 250 mile on a tank of fuel, with a 25 gallon tank, not good. What I noticed is oil around the boost tube joints especially the one comeing out of the inner cooler, is there some oil in these tubes? I cleaned the outside of these pipes about 5k miles ago, and there wet again. This is my 1st diesel so im alittle green, but I need better than 10 mpg running empty. Help!!!I
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Old 01-19-2014, 06:16 PM
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Oil is in the tubes.

The CCV (Crank Case Vent) is to the air intake just ahead of the turbo, directly above driver's side valve cover. This will be the source of most of the oil that gets into the pipes. The turbo can occasionally leak oil into the charge pipes as well but I have not seen this personally.

There are a lot of things that can drop fuel economy so I can't guarantee that the oil is the culprit. At the very least see if you can figure out how much oil has collected in your inter cooler as you can loose efficiency if it is badly blocked. If you feel ambitious or there is a lot of oil in the inter cooler, pulling it out of the truck and cleaning it internally with simple green and a good flush of water could make a difference.

To get better advice provide more info about how you operate your truck and how it is set up. Useful info to me would be measured fuel pressure, exhaust back pressure values and boost values. Also helpful would be gearing and tire size, as well as desired operating speed and engine rpm.

Thanks and good luck,

Jon
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Old 01-19-2014, 07:50 PM
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It is bone stock except for tire 285/75/16, ccsb, no guages, where would I measure fuel pressure? How do check exhaust back pressure?
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