@Bill, I have no idea what OVC means. Maybe a typo. I am assuming BOB428 is referring to the oil screen/filter for the cam solenoids on a OHC engine with VCT. I did mention that before, but CP says he has a new one in there. Going back to oil pressure. I just find 75psi @ 2grand is to high. And 33psi @ idle is still to high to my liking. I usually see pressures like this in a cold engine when viscosity is thick but will drop to normal once warmed up. Normal oil pressure at idle should usually be +/- 10-20psi, disclaimer, approximate numbers here. Engines will vary. Yours should be as stated in my earlier post as per ALLDATA specs. I also checked with Mitchel ondemand 5, same specs given. This is not a performance engine. I mean, a nascar engine will get 80psi @ 8 grand. A LS1 engine may get 75psi WOT. SO I am still stuck on stupid on that one. So, I guess what I am trying to say, is stop looking at the fluctuating readings, we know they are fluctuating. Hence the performance codes. My gut feeling is still that this is not a circuit/sensor/solenoid problem, but more a mechanical one. A rule of thumb in the industry was 10psi per 1000rpm. But with newer engines coming out, some with 0w20 oils, this rule of thumb has changed a bit. If you are getting 75 @ 2grand, I wince what it may be if you redline this. Foreseeable oil leaks in the future from crank or cam seals. Anyway, get the end play checked out, try to clean out the oil passage that supplies the exhaust solenoid if you can get to it without removing the cam and head. If not, like I said before, this MAY end up being a head job. That TSB is not there for nothing. I have seen alot of these engines with that same problem. Most of them were oil related and fixed with a flush. Sadly, some of them needed major repair. I just think it is a GM design flaw, I don't see that alot for other manufactures with same system. The 2.2l ecotechs are a nightmare in this dept. When I was working for GM, I could easily see two or three cars a day with same issues in regards to VCT related codes and timing chains that were loose cuz the guides disintigrate and then go into the pan, clog up the oil passages etc.