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So I have an 04 6blow and I’m having issues with tracing down an intermittent power loss while driving . I can’t get it to replicate the problem it ,does this randomly . So what It does is while driving it the motor gets real quite and does not respond ,the truck will start to lose speed and as long as my foot is on the pedal it will continue to do this for about 10-15 secs and then picks back up or I let off the pedal and everything goes back to normal operation . What Iv observed is that it only does this at anything above 2k rpm’s . No smoke comes out either when this happens , Iv removed the EGR , replaced all filters , new fuel pump , blue spring kit , and have a fuel pressure gauge mounted on the fuel bowl . Fuel pressure holds steady at 60psi when it does this happens. I have unhooked the icp and still does the same thing , it’s like it just loses all power it’s rally aggravating at this point it gets worse when I haul heavy . Iv had forscan hooked up to it I was monitoring everything and the only thing I could see is that ipr and icp where both dropping out when it started to loose power. I’m hoping someone could shed some light on this topic would be greatly appreciated
Have you monitored ICP desired as well as ICP actual (and IPR % Duty Cycle)?
the only code I’m getting is for the EGR which is still plugged in but zipped tied and a block off plate , I have looked at the desired before I’ll have to check again I know last time it wasn’t exact what desired was
These are the graphs I had , the top red line is APP (pedal percentage) when it starts to peak is when I’m flooring it to mark time frame that it started to drop out on power
I had the same EXACT issue with a 2005 6.0. I followed this thread https://www.ford-trucks.com/forums/1...r-loss-18.html (very long and solution is near the end) It covers everything @GSlahor went through for several months chasing the problem. At the end of the day the it turned out, as with @GSlahor the problem was the main engine wiring harness. Replaced the main harness with O.E.M. harness and it solved the problem. My diesel shop has had two others exhibiting the same type issues and replacing the harness solved the problem. If you go this route it is crucial to check numbers to ensure you get the correct harness. Some parts houses can charge up to 50% restocking fee. The local ford dealer wanted over a grand for a new harness in 2023. I was able to find at an online Ford parts warehouse for $650.00. Hope this may be of help.
I had the same EXACT issue with a 2005 6.0. I followed this thread https://www.ford-trucks.com/forums/1...r-loss-18.html (very long and solution is near the end) It covers everything @GSlahor went through for several months chasing the problem. At the end of the day the it turned out, as with @GSlahor the problem was the main engine wiring harness. Replaced the main harness with O.E.M. harness and it solved the problem. My diesel shop has had two others exhibiting the same type issues and replacing the harness solved the problem. If you go this route it is crucial to check numbers to ensure you get the correct harness. Some parts houses can charge up to 50% restocking fee. The local ford dealer wanted over a grand for a new harness in 2023. I was able to find at an online Ford parts warehouse for $650.00. Hope this may be of help.
awesome! Right now Iv been out of town with work I’ll have to look more into this thread tonight thanks for the link ! I wonder if the pins in the harness are sliding back or stretched not making enough contact
My belief / opinion is an intermittent wire failure somewhere in the harness, possibly a compromised wire triggered by temperature or vibration. When it occurs it causes a cascade effect on multiple sensors throwing bad codes / signals affecting the reliability of normal computer diagnostics . Trying to ohm out harness wires when a problem is intermittent in my opinion is hit or miss if the wire malfunction isn't occurring at time of test. Good luck in your quest and keep us posted.
Ok sorry for the delay,Iv just been busy with work and family and my new job Iv been averaging 60 hours a week so I haven’t had time to look at the truck up until now . So I started data logging and saw something interesting . It’s been a compound of sensor failures and pigtails that had broke in half ,my map sensor would blip and drop to 8 psi which is not possible. It would be me driving at the top of mt Everest or a serious vacuum . You can see that map drops and holds at 8.2 psi for several seconds causing massive defueling to occur hence why my truck wouldn’t move and get very quite , this was the only time I had my scanner on it and was able to catch it doing it this bad . This is what made it extremely difficult is that it would do this a lot but it would only do it for a fraction of second and this time it held the malfunction for about 5 seconds and again this was intermittent
So I replaced it with a new Motorcraft one , and this made the truck run way smoother and as of now has stopped the bucking and power loss but another problem arose , the truck started to develop almost a choppy idle , my icp was registering pressure and seemed to read correctly but as soon as I unplugged it the choppy idle went away so that was replaced with a genuine ford part and fixed that problem
After driving it on highway shortly after map and icp sensor the truck was still surging on the highway generally around 65-75 mph but this was turbo surging you could hear the turbo duty cycle hunting very briefly as soon as it came it would go away . This is the pigtail that broke in half the vane solenoid, replaced as well
I wanted to check one last thing and that was the ebp sensor . I found that it was biased high which under load there’s no telling how it was making the duty cycle act as I didn’t have it recorded at the time of road test so I replaced it with with a factory part as well and as of today everything is operating normally
so again sorry about the late response , I hope that everyone that is having similar symptoms can come here and see that multiple issues can arise at once and not throw a check engine light for any of these issues
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