Well, no codes stored that I can see. The CEL today is now coming up with the bulb check as it should and the truck is running normally. I still need to fix the nozzle, and upon purchasing a new fresh air breather hose, I can see that the hose that's on there now is not stock, so I am starting to think the nipple was actually broken about 9 years, 65k miles ago, when I had the dealership replace leaking valve cover gaskets under warranty. I can't say for sure, but the oil filler neck was also broken during that visit and I decided to leave it as is. It wouldn't surprise me to know the shop broke it and didn't bother to warranty out the intake at the time. This particular dealership has since gone out of business and good riddance.I'll have to try to pull codes later. It has been running fine and no one has been under the hood in 2500 miles since the last oil change, which I did myself, so I can't imagine how long it has been broken. The hose was literally tucked under some other hoses as if someone tried to hide the fact that it was broken.
Problem though is that the CEL isn't on today. It was last night when I got the REP warning, but as soon as I limped it home and restarted, no light, no warning, and the CEL isn't illuminating during the bulb check upon startup now, which is weird. Bear in mind the gauges are off because I snapped this during the bulb check after turning the key on before starting. View attachment 356735
On the plus side, the crank case is still getting fresh air, it's just not filtered. I wonder if I can just plug the nipple and get a breather filter for the valve cover. Old school, but it couldn't be any worse than it is now.
The downside, however, is that I think I'm dealing with a grounding or other intermittent electrical problem that is causing this reduced engine power to come around. It happened 3 or 4 months ago after a heavy rain, but last night it was dry and in the upper 50s with a low humidity. Fun!