03 4.8 Truck HIGH Oil Pressure-90psi EVAP Purge-100%

[AdamE]

I am having a hard time trying to diagnose the probs i am seeing in this truck its all stock - 2003 Silverado 4.8 - RWD 60e
Oil pressure gets up to 87psi at some point in the log and EVAP Purge is all over the place goes to 100% a lot.
Changed oil and filter what came out looked fine, put in 5w30 and new filter, same issue. PCV valve is open, it did not have a check valve "ball" inside of it, was not plugged.

Is it possible that catalytic converters are clogged somewhat and the exhuast is, i guess pressurizing everything? haha sounds rediculous and it could very well be something simple i've overlooked. (Happens 90% of the time)


SCAN FILE ATTACHED

Adam 03 BlackRado 4.8 60e RWD HighOilPSI HIGH EVAP PURGE.hpl

[5FDP]

I didn't see oil pressure in that log unless I'm blind.

I never had luck with those year computers for logging the oil pressure anyway, half the time it never matched the cluster read out. These trucks are notorious for oil pressure sending unit failures though.

[AdamE]

Sorry, youre right i posted the wrong file. It does represent what oil pressure i see on the gauge as well.

blkrdo wot.hpl

[5FDP]

It's worth the time to me to hook up a manual pressure gauge to see if it matches.

My 2006 truck with a 5.3 had 258,000 miles on but at full throttle running 5W30 and 10W30 it would see nearly 80psi, a little less once oil temps got nice and hot, mainly in the summer months.

[AdamE]

Ok ill do that! Any ideas behind the 100% EVAP Purge?

[AdamE]

Checked and verified, mechanical gauge- oil pressure shows the data on hpt scanner is true.

Evap Purge is still holding 100% at random times. Thinking i may just swap the other p59 ecm i have, its for my bagged c10 im building, already unlocked, idk..