Intermittent boost loss on grade
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Lead Driver
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From: Other side of the sunrise
Wow, Switzerland. How cool is this site?...
Sounds like you guys are having similar issues. However, the loss of power didn't occur until lately and all of the sudden. I'm leaning to believe that the whistle is one issue and the loss of power is another. It's almost like the engine just clicked into a "limp mode" just before the loss of power on the hill. The whistle had never been accompanied by loss of power until this occurrence, but it had been getting progressively louder up to this point.
My thought is that the whistling has probably been increasing due to the excessive heat from whatever the power loss issue is, that had been worsening until it snapped and caused the loss of power. Bpounds seems to be thinking along the same line as I in thinking that the computer compensated for the heat somehow. His theory was that the engine "defueled". However it compensated, it seems like it did in fact compensate. At least that's my theory. Does this make sense?
Sounds like you guys are having similar issues. However, the loss of power didn't occur until lately and all of the sudden. I'm leaning to believe that the whistle is one issue and the loss of power is another. It's almost like the engine just clicked into a "limp mode" just before the loss of power on the hill. The whistle had never been accompanied by loss of power until this occurrence, but it had been getting progressively louder up to this point.
My thought is that the whistling has probably been increasing due to the excessive heat from whatever the power loss issue is, that had been worsening until it snapped and caused the loss of power. Bpounds seems to be thinking along the same line as I in thinking that the computer compensated for the heat somehow. His theory was that the engine "defueled". However it compensated, it seems like it did in fact compensate. At least that's my theory. Does this make sense?
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From: Other side of the sunrise
I hesitate to even offer an opinion because you guys know so much more about this than I. But defueling due to overheating sure seems like it matches his symptoms. That overheating could be the oil or coolant. I'm thinking oil due to a clogged cooler, and the boiling sound is in the EGR cooler.
It's okay to laugh at my stupid ideas, I won't be offended.
It's okay to laugh at my stupid ideas, I won't be offended.
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Switzerland is an overpopulated country with people that have never learnt how to smile. The mountains just hide the sorry bunch we are ... We're just like any other country with some good and some bad sides. When you're a tourist, you usually only see the nice positive things.
Anyway, to the main subject. I've been in an ambulance, a DRW with a weight of about 4500 kg (er, that's about 10'000 pounds if I'm not mistaken) in mountains in the middle of summer and we were doing a climb test with the unit. Well, when the fan kicked in that engine just felt it went into limp mode and the whine was extremely loud. Medics come back to me once in a while with this same complaint but there is no issue with the truck, it's simply happening when temperatures are high. So it's of course impossible for me to judge of your exact situation but I it seems this does not occur regularly and not necessarily always in the same conditions, do not ask me why. I just felt I had to respond to your specific question that the symptoms you described did not necessarily give an indication of a technical issue, imho.
Anyway, to the main subject. I've been in an ambulance, a DRW with a weight of about 4500 kg (er, that's about 10'000 pounds if I'm not mistaken) in mountains in the middle of summer and we were doing a climb test with the unit. Well, when the fan kicked in that engine just felt it went into limp mode and the whine was extremely loud. Medics come back to me once in a while with this same complaint but there is no issue with the truck, it's simply happening when temperatures are high. So it's of course impossible for me to judge of your exact situation but I it seems this does not occur regularly and not necessarily always in the same conditions, do not ask me why. I just felt I had to respond to your specific question that the symptoms you described did not necessarily give an indication of a technical issue, imho.
Hotshot
Joined: Aug 2006
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From: Whittier, CA
That's what I was remembering too. But I didn't know that it would set off the wrench warning lamp. Mine has never been that high, but I did see 248°F, and I defueled with my right foot.
Which brings up a suggestion for the OP. If you do nothing else before your trip, invest in an Edge Insight monitor so that you can see the vital signs of your engine. I would suggest the original model to keep it simple. Too bad you didn't have any numbers to share with us in your opening post. The gauges on your dash are of little use.
Which brings up a suggestion for the OP. If you do nothing else before your trip, invest in an Edge Insight monitor so that you can see the vital signs of your engine. I would suggest the original model to keep it simple. Too bad you didn't have any numbers to share with us in your opening post. The gauges on your dash are of little use.
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From: Tenn.
LostinTn.
I'm responding to your post in hope you have found the cause of your loss of turbo boost. My 2006 6.0L has started the exact same thing only mine you can set your watch by. The longer the climb the more it does it. Please tell me you have found the trouble. My local Ford dealer has been going back and forth with Ford for two weeks now but, still no solution. My problem started when they change the Turbo out and no codes.
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From: Other side of the sunrise
I'm responding to your post in hope you have found the cause of your loss of turbo boost. My 2006 6.0L has started the exact same thing only mine you can set your watch by. The longer the climb the more it does it. Please tell me you have found the trouble. My local Ford dealer has been going back and forth with Ford for two weeks now but, still no solution. My problem started when they change the Turbo out and no codes.
Mine turned out to be that the oil cooler failed and oil temps caused the engine to de-fuel on the grade, which then the transmission had to drop down gears to make up for the lack of power. Dealership replaced oil cooler, egr cooler and VC-9 flush. I deleted egr cooler and installed coolant filter.
Hope this helps, T
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From: Tenn.
Loss of boost
Thanks again for your response. First I have been able to determine that I have NO mechanical problems. What I have found is that when my Turbo was changed the dealer updated the Flash. To quote Ford from an e-mail the new flash contains "a product protection strategy to better detect potential concerns". In short they have narrowed the parameters that the PCM monitors which apparently my older truck operates fine at times just outside the new limits. Ford can not or will not go back to my older flash so I have ordered a SCT SF3 programmer to test this theory. My truck computers were reset to the relearn mode. My transmission shifts smoother but, the tow problem is still there. I will let you Know if that solves the problem. Ford and my local diesel mechanic have given up saying nothing is wrong. Bruce
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