This am after cold soak, TFT was 67 degrees(EOT 77 and ECT 70 degrees). Sorry, I did not post that at first. Also, this am after about 15-20 min idle time while hooking up to 5th wheel temps were: ECT 154 and EOT 146 if that means anything. TFT while driving unloaded were 155 to 158. I wasn't paying close attention to the TFT while towing because I was so focused on the EOT and ECT delta that I almost ignored the TFT. I recall no higher than 160-161 TFT while towing. I will post temps tomorrow am again.

 

Im with you xb70
I didnt see it till you mentioned it 7 degrees is alot and could get worse as it gets hotter

you shouldnt have a spread after cold soak

good catch xb-70

 

First off the ect is not in operating temps. 185 is not right. You should be running 190-195 driving unloaded. Pulling a trailer should be 195-210. If he never got over 187 pulling then he has a problem. Is it the gauge reading wrong? Bad t-stat? Who knows? There is no way to give a definite answer over the Internet with the info we have on hand. Now the 7 degree spilt does raise an eyebrow, but he didn't state how long the truck was down before he got that reading. If the truck was down long enough to have had a true cold soak then yes he needs to find out what the problem is with his readings. Then go from there.
For the record I never said anything about what to do to fix the problem at hand I just stated that you should always change the egr cooler when you change the oil cooler.

 

Okay, here are the temps I saw this am. Parked truck at 300 pm and at 630 am I saw the following temps: ECT 72, EOT 78, TFT 67. The outside temp was 63 degrees. On my 12 mile ride to work I had ECT 180, EOT 200, and TFT 143.
Called my dealer and I'm dropping off the truck tonite. They are going to verify or over rule the temps I'm seeing. Fingers crossed, but I'm expecting bad news.

 

your gauge is off can you reset the gauge to manufacture settings before you take it to the dealer

your eot and ect were really off
tft was closer to ambeint

my temps were closer than that after 7hr sit

ALL MY TEMPS ARE WITHIN 1 DEGREE AFTER COLD SOAK
all fluid temps should be the same in the am start
IAT should be close but can be off alittle because its not a fluid

 

Interesting thread but lets don't get it shutdown for attitudes.

Maybe the cold soak needs to be longer to verify temperature accuracy. My ECT/EOT gauges are always a little different after a 12 hour soak but very close after 24 hours. There's always some percent of allowable difference. What if it's the ECT reading wrong and not the EOT? Obviously they're working to some degree but without specific test equipment (IDS or equivalent) it's hard to say.

 

Good point. We seem to always want to blame EOT. Have seen quite a few low readings on ECT lately. I wonder if those that have had low ECT readings and replaced their "T-stat" only to find the temps the same.

 

3:00 PM to 6:30 AM = 15 1/2 hours cold soaking

This is longer than necessary to get EOT and ECT within 1/2 degree on my truck using a Scan Gauge. The TFT will be a few degrees higher, but that's another story. The EOT and ECT should be identical.

10% error is not an allowable difference. As I pointed out, 10% at 70F is 7 degrees. 10% error at 200F is 20F. 20F is 133% of the FoMoCo allowable EOT ECT delta.

 

After a 12 hour "cold soak" I checked my temps with 2 different scan gauges. ECT and EOT were identical. Ambient temp of 74--ECT 85.9 (202 at shutdown) EOT 85.9 (207 at shutdown) with ambient temp of 93 at shutdown.

I'll definitely be interested to see the diagnosis, however if the temperature sensors do turn out to be "OK" then 1) the coolant is still too cold, even at 186*, and it needs a thermostat. 2) the oil cooler is plugged and needs to be changed.

One other thing that hasn't been mentioned is that possibly the coolant is running through too fast and the oil cooler isn't getting a chance to do it's job although I think this is a rare possibility.

 

I don't know anyone in this thread who claims to be an expert on a 6.0. No one who has responded so far even works for a Ford dealership, at least that I know of, and I damn sure don't claim to be. We here in the forum do what we do to try to help people out, whether we are right or wrong, and it's up to them to decide what's best for them and their diesels. You can take all the shots at me that you want. I don't personally care. You are obviously an intelligent individual that could be a valuable resource to this forum but your condescending attitude is simply unwarranted.

 

 

A couple of questions for you. First, how many miles are on your truck? When the dealer flushed your coolant in 2006 (which is good but it was 4 years ago now) how many miles were on it at the time? After the initial flush and change the recommended interval is 50,000 miles according to the owners manual. You mentioned that the EGR was replaced, was that the EGR cooler, EGR valve? If it was the EGR cooler, did Ford check the oil cooler or flush the cooling system at that time?

The 7 degree difference cold is high, mine is between 2 and 3 degrees. I do have a new sensor for oil temp, but not coolant. Maybe you would need to replace both to insure they are good? Even still, the oil temperatures reported sure sound like a clogged oil cooler to me and I'd bet that's what Ford finds too. As for the EGR cooler, if yours isn't leaking (and it's not likely to in my opinion) you would probably be fine just leaving it in there and not worrying about it. The 2003 EGR coolers are pretty tough, and although I have heard of a failure here and there, it is certainly not the usual failure point on a 2003 as it is on the other years.

By all means have the dealer flush your cooling system BEFORE the change, and after if they insist. It's a good time to consider using an HD ELC coolant as well.

 

Sorry I didn't include mileage in the original post. My truck has about 93,000 miles on it. I also mispoke when I said the coolant was flushed in 2006. The coolant was flushed by Ford in 2008, the truck had around 62,000 miles at the time. The EGR valve and the HPOP were replaced at around 87,000 miles.

Heard back from the dealer. They saw a 38 degree delta between ECT and EOT. That's right on par with what I was seeing with my Insight. SA didn't know what the temps were before start up. They are replacing both the oil cooler and the EGR cooler. SA wasn't receptive to flushing system before the job. He stated that Ford reccomends flushing the system afterwards.

 

I can see on blown oil coolers and blown egr coolers to flush after so they dont make a bad problem worse BUT

but if its NOT broken yet they should flush before they throw in the new coolers
I flushed my system right into the old oil cooler and then pulled it out

so they didnt seam to concerned about the temp spread after cold soak go figure that
hope they checked the spread at startup

my oil cooler has only has 250 miles on it at 60mph empty I have a 3-6 degree spread it will be interesting to see your spread after the work

good luck

 

I am not far up the road from you and with outside temps about the same there is a 3 degree difference between all 3 liquids, trans being the lowest. The oil and coolant are within 1 deg apart in the morning. Somehow you are getting false readings on the oil side.