I actually found out what I was thinking was wrong. When I spun the compressor by a drill, it acted like the EPR valve was stuck closed. you wouldn't get any out put from the front after 5 or 10 seconds, and when I removed the valve, it was fine. Not knowing when it is suppose to be closed, I had no idea if it was any good. I took the Valve out of another compressor that I have that I know worked when I had it in the car, and it worked how I thought it should. That doesn't mean the valve is good, but it means it's not stuck.

Duane