I've been wondering about two things. One is my IAC setting. I have no trouble setting a warmed up engine to an IAC setting of 10. It will stay there for days and then one day it will be at 35. Next day it might be back to 10. So I am wondering what might affect the reading after it is set. Weather? Or does this indicate the the valve is beginning to fail? Or is this completely normal?
My other questions relates to where to set idle fuel pressure. The recommendation I read is usually around 43 hose off, then +/- 3 for adjustment. In my car, 43 hose off results in 35 hose back on. I've been told that this is too low. So I set it at 46 hose off and therefore 38 hose on. The car seems to run the same no matter where I set it. So how do I decide which is best for my car?
My other questions relates to where to set idle fuel pressure. The recommendation I read is usually around 43 hose off, then +/- 3 for adjustment. In my car, 43 hose off results in 35 hose back on. I've been told that this is too low. So I set it at 46 hose off and therefore 38 hose on. The car seems to run the same no matter where I set it. So how do I decide which is best for my car?