i have a rebuilt 350 with about 1000 miles or so on it. was sitting in a parking lot reving up the engine and i noticed that there was some moisture coming from the exhaust. couldnt see it or anything, you could just tell by the color of the blacktop. theres no smoke or anything and the engine wasnt cold nor was the weather. any idea what would cause this? i have a leak at the manifold. dont know if this means anything... pete
Water is a by product of the combustion process. It will always be present to some degree. Unless you have any other symptons to lead you to believe that there is a problem I wouldn't worry about it. It's why plain steel exhaust systems don't last long and stainless do. I would run the car for a while to get it good and warm so that all the water evaporates to make sure that your exhaust lasts as long as possible.
Mine does this for the first 15-20 seconds I run it, I dont think its anything to worry about it as all my cars do it...
exhaust moisture moisture also builds up after the engine is shut off & as the vehicle sits , depending on the hunidity in the air . always wise to drill a small hole at each end of the muffler at the lowest point to let the moisture drain off .
Pete I don't know where your located but if you live in a area that requires you to use gas with MTBE in it then you will always see that wet spot on the ground when the car has been sitting. Evan if the car has been running all day long. Oxygenated gas will always create vapor when it is burned due to the fact it is 15% water.
