CEL,just swapped engine

[montana105]

Hi everyone-just transplanted a 92 Ej22 into my 93 Legacy wagon,everything went smoothly,engine started right up runs smooth as hell,belched some smoke at first,not to worried about that as engine sat for a year and after everything checked out with no leaks and such drove it around easily for 20 miles,smoke cleared up.Parked it overnight with a large piece of cardboard underneath,today no drips of anything,no start up smoke,no smoke at all.Took the kids to B.K.,about 5 miles round trip,on the way back saw CEL pop on for about 5 seconds then it went out.I pulled over just to verify things,oil level good,coolant level unchanged in overflow tank,no leaks,appeased my worries and tok the car on a 100 mile jaunt,no CEL at all. Any ideas what would pop the CEL so briefly? Car did sit for 3 months with no battery until Thursday when i put battery on charger,no battery cables hooked up-just charger.Think car is just relearning itself.The low mileage engine is so nice,other then the whistling noise that didn't go away between engines,for only 500.00 I feel really good about a 72000 mile 2.2.We replaced the timing belt as we had no history on P.O.,and replaced clutch as mine was pretty well used,turned the flywheel.Everything is going great,just that one CEL. Again-any ideas? Thanks John

[jamal]

Pulling the code(s) would be a good first step. Directions are here.