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Old 07-14-2014, 06:59 PM
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Question Lots of codes which seem random--please help!

Long story short here is what happened. I have been getting codes P0261, P264, P0267, P0270, P0273, P0276, P0279, and P0282. I know they are all injector circuit low codes but when they come up it is random times with no adverse symptoms. All I get is the check engine light on with my Edge CT programmer telling me I have codes. Recently I have had issues with starting when cold, but not while I have the codes and the codes do not show up when it is struggling to start. When it is cranking it will chug as if I am running on fewer than 8 cylinders and it is just bellowing black smoke until it starts running on all 8. After it gets going it runs perfect and if I would turn the truck off and start it up again it will have no problems starting. It seems to only have an issue after sitting for a couple days.

Now to the second problem which may or may not be related. I have also gotten the P0299 code for turbo under boost. I was pulling my 33 foot camper at the time and it seemed to struggle to gain speed and quickly lost speed on any incline. I had a friend behind me tell me he could occasionally see black smoke come around the camper. I was watching my boost on the Edge and it was telling me constant 20-22 psi in OD with the torque converter locked and when it downshifted on the hills I was easily losing speed and boost showed 27-29 psi. I have never seen the boost go that high so I started to ease up on the throttle to keep the boost around 25 psi. On my way home from the camping trip, which was 3 days where the truck wasn't started, it gave me the rough extended crank with black smoke.

My truck is a 2005 Excursion with the 6.0 and there is roughly 106k miles on it. I changed the oil and filter at 104k and both fuel filters at 99k. The truck is as far as I know completely stock. I did a coolant flush about 3 weeks ago. I did notice this year when I started towing again that my coolant temperatures while towing vary greatly. I will see anywhere from 190-218. When the temperature hits 218 I will hear the fan kick in and bring the temps down to around 200. This is why I did the coolant flush thinking the thermostat was bad, it did not correct that problem. My oil temperature will hover around the 230 range not moving much while towing. When the truck is empty down the highway I see at most a 20 degree delta which was another reason for the flush.

Sorry for the long post I just wanted to get as much information as I had on here and any help anyone can give me would be greatly appreciated.
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Old 07-15-2014, 07:55 PM
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Your first problem is most likely a FICM on the way out. But, before you commit to that, make sure your batteries test out good and make sure your alternator is putting out at least 12 volts. Anything above 12 volts is even better. If your alternator is questionable, check with Ed at FICM Repair.com, he's the man to talk to, both with FICM repair and charging issues.

The turbo could be related to the above issues? I just had mine apart on my 06 w/180k on it, and it wasn't nearly as dirty as I thought it would be. But, a good cleaning couldn't hurt. Also, I know there are pros and cons, but if your not in an emission legal state, open that dude up and get rid of the converter and muffler. Your turbo will spool some faster and dump the heat without the bottle neck of the converter and muffler.

Your other issue with oil and coolant temp sure seems like an oil cooler that is getting plugged. But, while towing, your numbers are going to be higher due to load. Make a longer, level, unloaded run and see what you come up with. Did you actually replace your thermostat during the flush? Thats a quick way to see if your coolant temp fluctuations are thermostat related.
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Old 07-29-2014, 04:06 AM
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Thanks for your help. So far I tested the FICM and it was not getting the proper voltage. So I sent it off for Ed at FICMrepair.com to fix. That has cured my starting issue and I am glad I decided to go with the Atlas 40 program. As far as the towing goes I have not taken the camper out so I will let you know how that goes on my next trip. Have to get brakes first. Thank you again for all your help.
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