2002 Sentra periodically won't start. It seems like it happens after the car sits for a few days. The battery is good. After trying to start the car many times I give up. After I call for the tow truck, the car starts. Of course, it always happens when I am far from home.

The engine does not turn over or click. After trying to start it for about 5 minutes, it finally starts.

The dealer can not find anything wrong.

take a long prybar and tap on the starter when the problem happens

I am having the same problem with my 2002 SER sentra. I have had it to the dealer three times and they can not find a problem. If i do have it towed it starts for them.

I had the same problem with my 2002 SE-R. It's the fuel pump. After the car sits for a while the fuel pump loses pressure. Each time you attempt to start, the pump gains a little pressure so after a while it will start. The longer the vehicle sits, the longer it'll take to start.