I have a 89 Buick Century Custom. On the first start of the day, I have no problem. No smoke and no difficulty starting. However, after the car warms up, say, after driving to a gas station the following happens: When I attempt to restart, it just cranks and cranks. I pause and let it set for about 5 seconds. I turn the ignition again and it starts after a few cranks. It bumbles a bit and acts like it is going to die as white smoke comes out of the exhaust for maybe 3 to 5 total seconds. Other times, it pops right off with no smoke. This seems to be a warm weather issue only as I don't really have a problem when during winter. I've read about fluids leaking but most of those address blue colored smoke or things that happen on the cold start up, which is not my problem. Also, I cannot be sure, but I think I might smell just a bit of gas after the car restarts.
Other's experiences with this? Ideas? A mechanic told me that all old GM's do this, but I'm not satisfied with that answer.