I should start off by saying the car has never thrown a check engine light and I am the original owner. The owner of the Chevy dealer I bought it from is in his late 60s and put about 2000 miles on the car before I bought it. Went for the first time to inspection today at a private facility because of the tint on the windows of my car. They hooked into the terminal and first showed 5 separated not completed codes. The battery hasn't been out of the car at all this year and there has been no computer work done to the car. I took it out and drove some more and returned. Still 5 not completed (cat, o2, evap sytem, second. air, and I forget the other.) Back out for another ride to try to get the readings. Take it to another mech. friend of mine and he hooks up his Snap On scanner. Now im down to just 2 not completed readings. This was after driving for about an hour. We try turning off the car, and restarting it like prior to the first test. AGAIN IT GIVES 5 NOT COMPLETES for the same diag.Eventually I again get to 2 (evap and air again). It acts as though the battery is being disconnected and its not carrying a memory and won't complete the evap and second. air. I again drive it further and still the same. I stop at a dealer Ive used before and the service manager had never heard of this happening before and told me to bring it in. At this point I can't even pass inspection. Anyone have any thoughts on this or seen it before?

 

9 times out of 10 it's a bad gas cap...

Peace
Chip

 

That was discussed also. The General replaced one cap two years ago under warantee also. Of course that doesn't mean that it didn't crap out though.

 

Take the gas cap off, then put it back on. Make sure you tighten it three clicks or more. Pull up your codes on the DIC, clear them. Then start the car. Take it for a short spin, 3-5 miles, turn the car off and see if the codes come back up again.