this system is dependent on oil pressure, be sure to ck oil level, quality, clean, and finally pressure. Often sludge gunk affect the solenoids movement, also ck for a grounded wire to solenoids...
I often advise a can/bottle of " RISOLONE" an oil detergent to clean the oil passages up...
I agree work the VCT issue first...
>>"what are the chances that the actuators are gummed up."
At 208K miles, Don't know BUT the product mentioned is @<10$ and will address issue, try it.
>>"What should the oil pressure read?"
You cannot trust the dash gauge, a mechanical gauge will need to be utilized. lets hold off.
>>"why would the engine run great until it got to full operating temp"
Often the computer is NOT controlling and adjusting until in closed loop - temp and time determine when it "takes over"
>>"You mentioned an additive. Do you have good results?"
RISOLONE is a product I have used for a long long time to help with sludge/gum issues and I have good results and NO adverse issues...
There is a BIG BIG difference between reading codes and using a scanner - the professional scanner will interface with vehicle computer allowing the tech to see live data & control those computer controlled devices. Relevant here We can view timing the relationship between cam and crank timing offset, this checking chain, tensioner, etc for causing an issue . SO-
We are NOT done working this yet. I am a hopeless optimist.
Try the suggested Hail Mary - I will look up the oil pressure specs and we will go on after the detergent has a few miles to (hopefully) work.
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