Just something I've noticed, wondering if I have a failure brewing.

I'm dropping a lot of info on this initial post to cover any questions you guys might have. This only happens on cold start up, ambient temp (& oil temp) is 60-70°. I should note that these readings are taken at idle. When I first start her up (2-3 second crank time) these are my readings for the first 20 seconds of run time:
ICP = 700
IPR = 15%

After 20 seconds or so the readings drop to:
ICP = 680
IPR = 14%

From that point in time until EOT reaches operating temp the readings gradually calm down to normal:
ICP = 480
IPR = 10%
and they return to 480/10% while driving and the RPM drops to idle. In 3rd gear in TC lock up my IPR duty cycle is 2800/41% in stock tune.

Recent maintenance:
My truck sat for a few months while I rebuilt the trans and lifted the motor to replace the oil pan & rear main seal. In the oil pan R&R I found no dents or cracks in the oil pick up tube and the pick up screen was not damaged and clear of debris. I also replaced the pick up tube gasket located at the mating point of the block. No leaks from above in the HPO system or below at the pan (as of yet HA).

I've switched to Rotella synthetic oil with a Motorcraft filter and have 650 miles on the oil change. The IPR, ICP sensor & pigtail were replaced last December. The readings were normal from then on till just recently.

Is something brewing here or am I just posting something dumb that is normal. Thanks for reading.

 

What do you consider normal?

What are you using to get the Numbers?

Those numbers don't look out of the "norm".

The PCM compensates fuel on start up in the PCM Strategy. That accounts for the increase numbers ICP/IPR/DC which go hand-in-hand based on PCM Strategy employed.

Are you experiencing any performance issues or notable anomalies?

As for the TQ Converter, someone else with better knowledge can answer that.

 

What I consider "normal" is I suppose a variant of the ICP 470-500 & IPR 9-11% at idle. Normal for my truck at idle when cold is ICP 510 & IPR 12% then settles down to 480/10% once EOT is at operating temperature. I'm taking the readings with Torque Pro and was backed up by my buddy's Snap On.

It's my understanding that when the ICP sensor is disconnected while running, the PCM will default HPO psi to 750. Knowing this makes me wonder if my ICP sensor is not reading properly when cold & possibly malfunctioning after only a year of being in use. Or something else is happening and this is a symptom.

No power loss at all. Just (for my truck) a higher ICP reading than I'm used to seeing.

Nothing is wrong with my TQ converter at all, I was merely stating how I tested the IPR duty cycle while accelerating.

 

Those numbers look normal, and your stock tune is a good one. Many things tinker with ICP/IPR combination, so you will get variances. Oil viscosity is one of the things that messes with it - which is altered by ambient temperatures... until the EOT climbs.

 

Alright I'll stop worrying about it then. Thanks Rich.