6.4L Power Stroke Engine and DrivetrainDiscussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.
6.4L PSD (2008 Job 1) - 42,000 miles. 5000 mile oil changes - 36K full workup (all fluids, filters including tranny and transfer cases).
Any of you that have the ability to display the EGT on your truck: What are your typical and loaded temperatures when driving 65 mph and when going up a significant incline. I usually drive around with a 17K GVW, so yes, it has to work hard (at least occasionally).
I've been having some issues recently where for some reason or another, I don't seem to be able to keep the EGT at reasonable temperatures except when driving on level roads at a constant speed. My "normal" EGT is always around 1200 degrees and whenever I push a little, the temp spikes up over 1400 degrees. It seems at around 1450, there has to be some safety program taking over where the ECM throttles back the engine - very uncomfortable when going up a hill or while passing someone.
During regeneration, the temperature sits between 1350 and 1400 degrees under nearly any load except idle or coasting.
I also noticed that when I turn on the ignition (not the engine) in the morning - after a total cool down, the EGT reads already 140 degrees ALWAYS. It never reads anything less while IAT or oil temp read ambient temperature values (around 75 degrees).
I subscribed to the 2008 shop manual (ALLDATAdiy.com) and did some research on EGT, exhaust system in general as well as diagnosis. I found a note that states, if the EGT reads more than 40 degrees different from the IAT when the engine is totally cold and not running, the EGT sensor needs to be replaced. Well, this seems true in my case since it reads 140 degrees when cold no matter what. However, there are a total of tree equal EGT sensors (one before the oxidizer, one between oxidizer and DPF and one right after the DPF. Each of them are identical devices. I disconnected each one and measured the resistance of the sensor. They all came in exactly the same (257 Ohm when at ambient temp). According to their table, that would result in a readout of over 140 degrees F. So, I am not sure what to do here, but I can't believe that all 3 sensors would have gone bad the same way.
Does anyone have some ideas about this? What are your EGT readings?
Any help please!
Thanks!
There are actually 4 egt sensors. Egt's 1,2,3 are all located in the exhaust stream before the DOC, after the DOC, and after the DPF respectively (as you stated). The other is located on the right hand exhaust manifold, pre turbo. EGRT1 is the name, I believe, which stands for Exhaust Gas Recirculation Temperature. It is the true EGT that tells you what the turbos are feeling (and the EGR system).
There may be a minimum temperature on the sensors, since they have no purpose reading below 140. If all 3 are giving you the same reading, the rule may not apply here. Was the article regarding specific to the 6.4L engine?
By the way, my oil temp never goes below 30C (86F) even in sub-zero temperatures.
What are you unloaded, flat ground, highway cruising temps? Summer? AC on?
I'm usually around 650F to 800F empty, 65mph, AC on, 85F outside.
Not sure if any of this was useful... just trying to help.
Thank you! Yes, it is useful. I will check that other sensor just to be sure. Your EGT is a LOT cooler than mine and that is what seems to be typical. Mine is almost NEVER under 1200! So, maybe there is a sensor problem after all....
Yes I do: I use the Edge Evolution usually on setting 2 (tow). However, this problem persists event when running the stock programming - aside from being even a worse "lame duck". The only time the EGT never enters the "too high safe zone which must be around 1450 degrees) is when it is in REGEN mode. In that mode, I can simply keep the hammer down and the temps hover around 1350-1400 consistently.
On an aside: Even after reprogramming the ECM with the recent programming where it shows you the "Clean Exhaust Filter" message, my engine WILL go into (high-idle) REGEN mode while idling which is something that programming was supposed to eliminate. Did I mention the fact that it is an 2008 F550?
I have an Evolution too, and my temps are like yours, around 1300-1450 pulling a good grade with 10,000# trailer. I've asked this same question never got an answer either way. All other temps are fine, 200 coolant temp, 160-185 trans temp. I'll keep driving till the engine tells me not to.
I to have an evolution and on my normal driving the truck stays in level 4. I'm never too hard on it at all and my EGT's are right around the 650-780 range when driving down the road at 65 mph on some what level ground. Pulling heavy in level 2 going up a big grade i can hit 1200-1300 EGT no problem and on level ground with 10, 000 pound trailer i'm back at 700-850.
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RIP 2008 CC LB 6.4...Rolled 3.5 times and walked away with only 4 scratches....Brand new 2010 F-350 CC LB 6.4 Lariat SRW, Camper package, Snow plow, dual alternators, cab lights, Back up camera and tail gate step, Rhino lined box, 6 inch pro comp lift kit, 35"x 12.5 toyo Mt tires, Buckstop outback bumper, 12000 warn winch, 4 lightforce driving lights on bumper, Spartan tuner and dpf delete with 4 inch mbrp exhaust, Winter studded cooper tires...stock size.
if you have an edge evolution it plugs into your ob2 port and it reads your egts for you from all 4 sensors that your truck has.
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RIP 2008 CC LB 6.4...Rolled 3.5 times and walked away with only 4 scratches....Brand new 2010 F-350 CC LB 6.4 Lariat SRW, Camper package, Snow plow, dual alternators, cab lights, Back up camera and tail gate step, Rhino lined box, 6 inch pro comp lift kit, 35"x 12.5 toyo Mt tires, Buckstop outback bumper, 12000 warn winch, 4 lightforce driving lights on bumper, Spartan tuner and dpf delete with 4 inch mbrp exhaust, Winter studded cooper tires...stock size.
I to have an evolution and on my normal driving the truck stays in level 4. I'm never too hard on it at all and my EGT's are right around the 650-780 range when driving down the road at 65 mph on some what level ground. Pulling heavy in level 2 going up a big grade i can hit 1200-1300 EGT no problem and on level ground with 10, 000 pound trailer i'm back at 700-850.
Factory safe limits for the EGT are at 1450F so after that it will defuel. I have mine set at 1430 so I get an alarm before it happens. Mine will read zero egt's if I just turn the truck to the on position.
Regens are around the 1200 mark.
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08F250 CC 6.4 PSD
Banks 6 gun/ram air
40' Stoneridge 5th wheel, coming in at 14K.
I have an Edge Racing Evolution....I have it set on level 2 and without me setting any alerts it has my EGT's at 1350, my oil temp at 250 and my coolant at 230....I think it has my tranny temp set at 250 also, but I don't remember, I'll have to check that again. Now these are alert max readings, not what I tow at.
egrta sensor the one on the engine turbo up pipe reads no lower than 140 deg.i assum because of the high temp ringht off the manifolds,i mean the exhaust swings past 140 deg quick after initial start up.it also says 140 deg in ford pced.as far as the high temps,if there is no abnormal load on the truck look for a alternative fuel source.....(oil in the cac or intercooler)
possibly oil growth diesel in the oil.
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