Will a bad fuel injector cause the exaust to blow heavy white smoke and smell like gas?

White smoke is a sign of a leaking head gasket or an injector stuck open. The coolant level should be going down if it is the head gasket. Too much gas will cause black smoke and soot inside the end of the tail pipe.

Here is a guide to test to make sure this is the problem.

https://www.2carpros.com/articles/head-gasket-blown-test

It also sounds like you might have a fuel pressure regulator that is leaking, here is a guide for that.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

and for the fuel injectors

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please let us know happens so it will help others.

You might try switching injector 6 with one from a different cylinder and the coil from cylinder 6 with the one from some other cylinder to see if the problem switches to one of those different cylinders. Resistance tests on coils only show if there is continuity. They don't tell if one is arcing internally from the high voltage.

You're trying to fix the results, not the cause of the problem. A misfire, as detected by the computer, will put excessive raw fuel into the exhaust system where the catalytic converter is overwhelmed. It will overheat and smell like rotten eggs.

The oxygen sensor only reports what it sees. Changing it isn't going to solve anything. In fact, you can have an injector stuck open dumping way too much fuel, but the oxygen sensor can still read normal swings from rich to lean a couple of times per second like it's supposed to. It doesn't respond to unburned fuel, just unburned oxygen. As long as the other two cylinders on that bank are working properly, the oxygen sensor won't detect a problem.

Yup. The symptoms are contradictory. When a coil or plug misfires, the unburned mixture goes into the exhaust system. The unburned fuel should be mixed with stored oxygen in the catalytic converter, and burned so you shouldn't smell anything, ... Yet.

The oxygen sensor doesn't respond to unburned gas, just unburned oxygen. The computer is constantly varying the mixture from too rich to too lean a couple of times per second, (that's where the converter gets the oxygen to store momentarily). With that misfire, it sees that oxygen all the time and figures the average mixture is too lean, so it adds fuel to correct that. The problem is no matter how much fuel it adds, there will still always be that unburned oxygen being detected. THAT's when the converter gets overwhelmed and you smell unburned gas at the tail pipe. You smell gas, but he computer sees a lean condition and tries to add more gas. That's the contradiction.

Most V-type engines, '96 and newer have oxygen sensors on each half of the engine so a misfire in one cylinder results in fuel being added to all three or four cylinders on that side. Older engines usually had one oxygen sensor. A misfire ended up with fuel being added to all cylinders.

There's two possible explanations for why the smoke occurs well after start-up. The cylinder heads and gaskets expand when they get to normal operating temperature. It could be that's when a leak shows up. It's also possible for system pressure to cause coolant to seep into a cylinder after the engine is stopped. If it's excessive, that can cause "hydro-lock". Since liquids don't compress, that fluid can stop a moving piston and cause a no-start, (no crank) condition. If, on the other hand, a valve is open when you start cranking, the liquid can be pushed into the exhaust system where it will vaporize after the exhaust system gets hot. That will take a few minutes. Some of the coolant will spray out of the tail pipe right away as a liquid. It won't smoke until it gets hot. That liquid can collect in the muffler which takes longer to get hot enough to vaporize the coolant.

One problem with my analysis is: "i checked for the antifreeze going down and no change". With the amount of smoke you're describing, you should be losing a lot of coolant. Next, "i found puddle thought it was water also till I put finger in it and smelled it, was gas". We know something is going on with cylinder number 6 but gas won't wash it clean; coolant will. A better way to tell if gas is dripping from the tail pipe is to wait and see what happens to the puddle. Water will still be there an hour later but it can easily smell like gas if there was a little in it. Gas will evaporate in a matter of minutes and leave a stain on blacktop or concrete.

Before taking it apart, are you familiar with the "sniffer" test? That involves drawing air from the radiator through a glass cylinder with two chambers partially filled with a special dark blue liquid. If combustion gases are present, the liquid will turn bright yellow. I'd feel better knowing for sure if the head gasket was leaking before tearing into it.

Nice work glad you can get it fixed. I've been told auto parts stores that rent or borrow tools often have this one but you have to buy the liquid. One bottle will fill the tool many times over so you're wasting your money. The fluid will not work once it gets contaminated with coolant. That's why mechanics always have extra, in case they accidentally get some coolant in it.

The fluid is expensive, and I've been told it won't work if it has been frozen. For that reason you can't buy it from the tool truck guys in the winter. It would freeze during shipping. Because of the cost, you might be better off just having a mechanic do the test. Or, at least watch him do one first. It only takes a minute. You squeeze a rubber ball and release it to draw air through the two chambers of fluid. If combustion gases are present, the liquid will turn from dark blue to bright yellow. If that happens, you simply move it to fresh air and draw that through it to turn the fluid blue again. You can use the same fluid over and over until it gets contaminated.

Here's what the tool looks like:

http://www.matcotools.com/catalog/product/AC560000/COMBUSTION-LEAK-TESTER/#productCustomerReviews

Good call! But a fuel injection cleaning can be done by a bottle of sea foam in the gas tank ( 5dollars). Oh, sea foam is the name of a cleaner for engines. What you can request after you do your own fuel injector cleaning, is request a throttle body cleaning their could be carbon build up on your throttle plate causing your problem. But get a bottle of seafoam and follow instructions for the "gas tank" method. And let me know what happens. Then maybel we can talk tha coolant pressure check

Could be just condensation/moisture./Water burning off, is the engine getting hotter than normal

Check the engine oil if its mixed with gas if so check the injectors and fuel pressure regulator.

That sweet smell is your antifreeze/coolant being burnt by your hot motor. It is not your heater core, if the smoke is coming from the engine compartment. If it is a very small puddle of green stuff on your driveway, it is one of the heater hoses coming into the heater core, or one into the manifold. If it is a big puddle, have someone check your water pump.