White exhaust smoke and some type of leak but runs great

[Broncosguru7]

Ok I have a 94 itasca class a with ford 7.5 v8 the unit starts and runs great quite no over heating but I did notice white smoke coming from tail pipe It seems to go away once the unit is running and driving But in my driveway this evening I noticed there was some type of oil or liquid underneath the unit It was raining So the ground is wet and it did not mix with water Put my finger In it but it had no odor at all Nor do you have any type of greasy feeling I'm wondering if it wasn't anti-freeze The unit seems to be cooling the engine fine and it drives great any ideas

[chuydog]

White smoke is probably water or coolant, blue smoke is oil and black smoke is fuel. You might want to pressure test your cooling system and get an oil analysis to see if coolant or water is present. Is there oil in the coolant surge tank?

[Hooligan]

It's not unusual for white vapor /steam to come from the tailpipe until a gas engine warms up in cooler weather. if the last few morning you have been in the 30's-40's it would be normal...Particularly if it stops when the engine warms up.. Coolant getting into the engine cylinders would continue to make white smoke..
Check for external leak after the rain...
Good luck..

[BFlinn181]

Because of the size and length of your exhaust, it takes a while for it to warm up. The cool pipes will cool and condense all the water vapor in the exhaust, causing 'white smoke' until it heats up. You'll also get water drops out the tailpipe until it's hot. You don't want white, blue, or black smoke once it's up to temperature. Watch all fluid levels and only worry if you start to lose coolant and gain oil. At least you know the exhaust system doesn't have holes or leaks if it's coming out the end instead of the middle!

[Broncosguru7]

Originally Posted by chuydog

White smoke is probably water or coolant, blue smoke is oil and black smoke is fuel. You might want to pressure test your cooling system and get an oil analysis to see if coolant or water is present. Is there oil in the coolant surge tank?

I'm new to this and I may sound a little ignorant for this but I'm not even sure what the coolant surge tank is. Can this be easily checked or should I just take the unit to a mechanic just hate to take unit in and get robbed by someone telling me its something major if its not

[Mekanic]

Originally Posted by Broncosguru7

I'm new to this and I may sound a little ignorant for this but I'm not even sure what the coolant surge tank is. Can this be easily checked or should I just take the unit to a mechanic just hate to take unit in and get robbed by someone telling me its something major if its not

Some fokls call them the coolant puke tank as well.
there is a small hose (1/4 inch) attached to the radidator just under the Radidator cap The other end of that hose will be at the coolant tank. (usually on the bottom of the tank)
It have 2 marks on it
Full Hot
Full Cold
Make sure its full....at all times.
Do NOT fill it to the hot line when The engine is cold.

[BFlinn181]

The coolant surge tank is to hold excess coolant when the engine heats up. As the engine cools, it pulls coolant back into the radiator and cooling system from the tank to keep it full. It is usually close to the radiator and has a screw cap on it. The tank will have markings to show levels when hot or cold. This is where you add anti-freeze and water mix when needed.

[Hooligan]

This is what they are supposed to look like. Should be near the radiator.
Winnebago Itasca Coolant Reservoir Bottle motorhome GM Class A RV Antifreeze | eBay

Looking for any sign of oil getting into the coolant. Also if water or coolant is getting into engine oil it will look milky. Unless you see any other indication, I would just look for a external leak leaving that puddle under the MH. Watch your fluid levels as BFlinn posted...

[C-Leigh Racing]

If it is coolant getting into a cylinder or cylinders, the exhaust exiting the tail pipe will have a strange smell, kinda sweet smelling.
While the engines running, go to the end of the tail pipe, put your hand into the exiting flow then smell of your hand.
Those 460s sometimes will blow the head gasket between the cylinders & then leak coolant into the cylinders. They sometimes will crack the heads from high exhaust temps & then leak coolant into the cylinders like that.

Do you have any idea, if that engine has had any work done to it, maybe say one of the heads replaced because of a broken off ear for the exhaust manifold.
They are prone for that happening & then the head would need to be replaced.
Neil