Hi there. I have a Nissan Serena, 1970cc Injected Wagon. While driving, it was blowing out a lot of smoke from the exhaust and you could smell it inside the van. But I managed to get it home.I turned the van off and went inside thinking I'd sort it out the next day. Then I heard a fan sound coming from the engine and opened the van door and the inside of the van was thick with smoke. It's never done this before.