Heres the problem, I have a '94 LS with the GSR motor, I started getting code 22 the other day, but here is the weird part. It has worked just like this for the last 2 days.
9am startup car, no cel lights, hits vtec fine, park the car outside work in the SUN.
12pm go to lunch, right when i turn the key to on without starting the car, I get the CEL light, it stays on all day(code 22).
6pm park car at a friends.
10pm go to leave, no CEL light, repeat.

I replaced the vtec oil pressure switch. $70
I'm gonna have to pull out the oil pressure gauge and do some readings tonight with the helms, It also could be that the wire for the vtec oil pressure switch, but why would it work fine in the morning, and basicly when its cool outside its ok.

Let me know if you guys have any ideas.