About year and a half ago I had to park my car. I was starting fairly regularly with no problems. I then left for holidays and turned my alarm on out of habit. When I got home my car was dead. Assumed my alarm killed my battery. I wasn't going to be driving it anytime soon so I just left it the way it that way. A decision I wish I had never made.
So now a year later I am wanting to get my car back on the road. I got a boost from a friend and it started up right away. I let it run for about 30-45mins, turned it off and tried again and it was dead. Just assuming thats the battery needing to replaced. Not to worried about that.
My main problem is, while I had it running I would rev the engine a bit and tons of white smoke would come out the exhaust. When it was just idling there was a very little bit of smoke comming out.
What are some possible causes for this?