What exactly are these and why did you change them?
Quote:
Originally Posted by drummerman15
oil feeder tubes
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Since your expansion tank for the turbo coolant was empty, and they claim that the turbos are overheating...is it possible that your auxiliary water pump (that feeds coolant to turbos) went out and dumped the coolant? Maybe take off some of the plastic undercarriage and see if there is wet/dry coolant there? If that's your issue, that pump shouldn't be hard to replace and they do fail time to time. I had one failing with no warning.
As far as the vehicle going into limp mode at WOT, that is usually (but not always) associated with either coils (which you changed), fuel injectors (which it sounds like you didn't), and bad/cracked vent pipes (not sure if this is what you are referring to as oil feeder tubes). They have oil residue in them but are vacuum lines.
Do you hear any whistling under hard acceleration? Does the truck misfire/run rough when idling in limp mode? Did you gap your plugs or were they pre-gapped?
If your fault codes showed you misfire on one or multiple cylinders, but not all, you may have some faulty injectors. Misfires are not only caused by coils and that engine (N63) is notorious for injector failure. Check service history and see if those have been replaced under the N63 service bulletin. If not, that could be your problem and replacement could be free. Did you leave those codes stored on your DME or did you erase them? Helps the techs when codes are stored so you don't have to replicate the problem.
Sorry I'm brainstorming here but these are some things you should consider. Good luck on sorting this out and keep us updated.