I have put approx. 20k miles with the check engine light, engine fan, and "limp mode". Hasn't gotten worse or better. Dealership said 5k to fix with the cab off procedure. It still purrs like a kitten and saved me money in fuel by keeping my right foot light. So I think I might keep it this way for a while and save up.
+Todd Chester truck has 125k, the problems started at around 105k. So I have been running in limp mode for over 20k miles. Unfortunately the warranty is long gone.
+Brian Rayle, I have been doing the same thing for the past 5-10k miles. I have read that it could be the fuel pressure sensor or the harness that is under the passenger side valve cover. Once I source the harness, i'll replace both and let you know if it fixes the problem. I have yet to hear from anyone a solid method for testing the fuel system to isolate the problem to a single component. Most just offer the trouble shoot by replace method.
+Ernie Gregor good luck, I ended up selling the truck to a ford mechanic that "wanted a challenge" so now I'm back to a 6.0 and loving every bit of it!
Mine is doing roughly the same thing only bouncing from 2500-2600 rpm's. I monitor the fuel rail pressure and there is no spikes in pressure. Check engine light intermittently comes on and engine fan constantly on with check engine on. What was it with yours??.
Brian Rayle Problem went away by itself shortly after this. Made it another 30k miles and it started doing this again (which has been just recently). Same intermittent CEL (same p0088), fan, and loss of power. It only does it in weather above about 75 degrees. I also have watched fuel pressure and other live data while having the problem(s) and haven't seen anything alarming. Some people say to replace the high pressure fuel pump, but thats a pretty time consuming and costly repair. Have not been eager to jump on that one, and it also seems to me that if the pump was bad then it would have issues all the time and no be temperature related.
The high pressure fuel pump went out. Apparently the pump failure caused an injector failure (assumed metal debris). #8 injector was dumping fuel, washed down the cylinder, and trashed the bore on #8. Basically trashed the motor since 6.4s don't get sleeved. Ended up replacing the engine. If the pump is bad, it should be replaced and the fuel rails replaced, and the injectors checked/cleaned.
CollinsProjects was it constantly doing it? Mine only does after driving it for about 15 min and the temperature gets higher then it will throw a check engine light with a p0088 code I think is what it was. But before it throws that code it runs fine.
No, not constantly. Shut the truck off, start it back up and it would seem better for anywhere between between 10-100 miles then go right back to throwing the code and being problematic. We were out of state on a vacation when it started, and it only went about 1000 miles before we had the problem with #8 cyl and it started making noise on our way back.
I have put approx. 20k miles with the check engine light, engine fan, and "limp mode". Hasn't gotten worse or better. Dealership said 5k to fix with the cab off procedure. It still purrs like a kitten and saved me money in fuel by keeping my right foot light. So I think I might keep it this way for a while and save up.
+Brian Rayle should be covered by warranty if you only have 20k miles on the unit, correct?
+Todd Chester truck has 125k, the problems started at around 105k. So I have been running in limp mode for over 20k miles. Unfortunately the warranty is long gone.
+Brian Rayle, I have been doing the same thing for the past 5-10k miles. I have read that it could be the fuel pressure sensor or the harness that is under the passenger side valve cover. Once I source the harness, i'll replace both and let you know if it fixes the problem. I have yet to hear from anyone a solid method for testing the fuel system to isolate the problem to a single component. Most just offer the trouble shoot by replace method.
+Ernie Gregor good luck, I ended up selling the truck to a ford mechanic that "wanted a challenge" so now I'm back to a 6.0 and loving every bit of it!
Im looking at getting rid of mine for a 6.7l or a dodge. I can't sell with this problem, i have to fix it for my own curiosity.
Mine is doing roughly the same thing only bouncing from 2500-2600 rpm's. I monitor the fuel rail pressure and there is no spikes in pressure. Check engine light intermittently comes on and engine fan constantly on with check engine on. What was it with yours??.
Brian Rayle Problem went away by itself shortly after this. Made it another 30k miles and it started doing this again (which has been just recently). Same intermittent CEL (same p0088), fan, and loss of power. It only does it in weather above about 75 degrees. I also have watched fuel pressure and other live data while having the problem(s) and haven't seen anything alarming. Some people say to replace the high pressure fuel pump, but thats a pretty time consuming and costly repair. Have not been eager to jump on that one, and it also seems to me that if the pump was bad then it would have issues all the time and no be temperature related.
+CollinsProjects Chaffed wires on HPFP harness??
I have the same problem can some one help me please
Have you gotten this problem fixed? Mine is doing the same thing and am wondering what you had to do to get it fixed... if you have
The high pressure fuel pump went out. Apparently the pump failure caused an injector failure (assumed metal debris). #8 injector was dumping fuel, washed down the cylinder, and trashed the bore on #8. Basically trashed the motor since 6.4s don't get sleeved. Ended up replacing the engine.
If the pump is bad, it should be replaced and the fuel rails replaced, and the injectors checked/cleaned.
CollinsProjects was it constantly doing it? Mine only does after driving it for about 15 min and the temperature gets higher then it will throw a check engine light with a p0088 code I think is what it was. But before it throws that code it runs fine.
No, not constantly. Shut the truck off, start it back up and it would seem better for anywhere between between 10-100 miles then go right back to throwing the code and being problematic. We were out of state on a vacation when it started, and it only went about 1000 miles before we had the problem with #8 cyl and it started making noise on our way back.
HPFP WAS THE PROBLEM .. ? DID U CHANGE IT OUT YOURSELF?? DESPITE REMOVING THE CAB. TO REMOVE THE TURBOS?.. JUST CURIOUS
My truck is doing the same thing.. also.. chuggs... Chuggs.. gotta turn it.off for Abit turn.it.back.on an hit the road..