I have a 1994 toyota pickup 1/2 ton with a 22RE motor. I recently have replaced the timing chain. Just last week it started to amoke out of the exaust a white smoke only when I started it then it went away and I changed the pvc valve and it does not smoke. It was loosing coolant last week also but I just drained the coolant out of the new radiator I put in the truck and replaced it today and it seems to be fine. But is this any sighn of a head gasket leak prob? If so what should I do?