My wife started up the 4Runner this morning and upon first starting it make a "clanking" noise and then fired. It was running rough, so I had her shut it off. I popped the hood but didn't see anything obvious so I had her start it again. No noise on start up, but it still runs rough. There is also a white smoke coming from the exhaust pipe. It gets heavier if you rev up the engine. It smells like raw fuel. There is no check engine light on, although I haven't let the engine run for more than a minute. The truck hasn't been started since last Saturday and didn't notice anything then (though I'm not sure she would have noticed).

Any ideas what could be wrong? I'm not very knowledgeable in the engine area but reading on the net I see that white smoke from the exhaust could be a head gasket. I hope not.

 

We need more data--oil changed interval, coolant level, water in oil-, ??, Does the exhaust smell sweet or look like steam or smoke?? Check out the basics and get back to us.