Hey Larry, I don't know the exact answer to your question but was going to tell you that mine runs about the same amount of time when you first start. What we did was take that valve off the engine above the exhaust manifold and then found that air hose that comes up from the blower motor and then started the engine and could feel air blowing out of that hose so we knew that was working properly. Then we checked the valve which was stuck. We put power to the leads on that valve and it wouldn't open so we bought a new one and verfied that it worked before putting it back on. Within about five starts, our code went away and hasn't been a problem since. Good luck with yours. Bill.