Power loss during towing

[dukeyaz]

Usually I do not have any issues while towing. Last 2 trips I had a powerloss and my vehicle speed dropped to 25~30mph. It seemed to be temp related but at the time I did not have a scangauge connected. But I own one now.
I was towing from AZ to San Diego (I-8) and then again I-17 Phoenix to Prescott turnoff.

During idle the EOT shows 199 and ECT shows 88.
First it seems that my ECT is off. I will check my settings (Scangauge) and see if it is correct.

Is 199 for EOT OK or Not?

I did change to Synthetic (Rotella for Diesel)... Could this be my issue?

 

[DaveBen]

Your oil and water (coolant) temperatures should be within 20° of each other. You have a bad connection to the coolant gauge. It should read closer to 190° F. Rotella is great oil and I run it all of the time.

Dave

 

[dukeyaz]

I will try to reset ECT settings in Scangauge and see if it reads more closer to actual.

I moved to Synthetic because people said it was "better" so I am assuming this isn't my issue.... or hoping anyway.

Thanks for all of your reply's past and future, this forum is great because of you and guys like you.

 

[DaveBen]

Rotella is not your problem. Again, it is great oil and I use it all of the time in my 6.0. It is not the cause of your temperature problem.

Dave

 

[dukeyaz]

I know it has been about a month, but I finally got to drive my own truck for once today. I finally fixed my scangaugeII to read correctly.
While driving my EOT= 232 and my ECT=272 at the highest. During the drive the EOT was always 40deg lower.
After stopping and lifting the hood I could spin my fan easily.... Bad Clutch Fan?

 

[amdriven2liv]

What are your readings after a cold soak, to verify the accuracy of your gauges?

They should be within a degree or 2. (By the way, *fWT is also your ECT that is a standard gauge in the SGII)

This is a good gauge to see what your fan is doing.

Fan Speed Sensor (RPM)

TXD: 07E022099F
RXF: 04620509069F
RXD: 3010
MTH: 000100040000
NAM: FSS

KO=0 LI=533 HI=488 OR=0-4000

This next gauge will show if you have a "pending code" in the system. Pending codes will not set a CEL until it reaches a set of parameters.

DTC Count (Diagnostic Trouble Code Count)

TXD: 07E0220200
RXF: 046205020600
RXD: 3008
MTH: 000100010000
NAM: DTC


KO = Key ON Engine Off
LI = Low Idle
HI = High Idle (2500 RPMs for this )
OR = Operating Range

Truck needs to be at operating temp for the above.

 

[DaveBen]

272 degrees is way too hot for ECT! You have a fan problem or some other problem ( water pump?). Head gaskets could be a problem if you see coolant puking or low coolant in the degas bottle. Is it using coolant?

Dave

 

[dukeyaz]

So I replaced the water pump and it wasn't the issue. I then pulled the oil cooler and found the water passage to be completely blocked. I also found my fan clutch wiring to have been cut by the fan somehow. I will be replacing that today

 

[amdriven2liv]

Sadly, those passages plug up. It's like a filter in there.

And the Fan wiring does get clipped. Surprised you didn't get a p0528 code for that.