EDIT: Nevermind, the car is smogging again. Back to square one. Just did the same test again, and again the car stopped spewing smoke and is running clear again. Maybe it's just the cat is fully warmed up and working now?
I'm going to try the same test next time without spraying in water, just to see if maybe it's just the car warming up and then the cat kicking in or something.
---------------
My car is no longer emitting smoke out of the tailpipe. After endless random wandering and searching on the internet, I, by happenstance, came upon an ancient secret carried down and yet lost and forgotten by our motoring forefathers. Injecting the engine with a secret, and ancient ingredient, as ancient as the mountains and oceans. And that secret ingredient, sprayed directly into the engine, is...
Water.
I couldn't believe it myself. Water decarbonization. Old trick from old-timers. This my friends has been talked about here before, for performance and fuel economy gains, and this most certainly can help your fuel economy, some claiming up to 5%. Some swear they've never had their car run so strong and good after a water treatment. Man, it reminds me of hydrotherapy, and real water treatment, the use of hot and cold water, in the treatment of people and health problems. The many interesting benefits of cold showers for instance, jolting your body's immune system into overdrive, and many such other things. It is nothing new. In the past, in black and white days, water treatment was standard at every hospital. But pharmaceutical drugs are so much more profitable than water, which is free. Everything old becomes new again.
My car was just spewing smoke, like it was chain smoking phone pole cigarettes. I read about this water decarbonization on this thread:
Just did water decarbonization on Mazda 3 - Bob Is The Oil Guy
I disconnected the line from the brake booster to the intake, or fuel injection, or whatever that thing is. Hooked up a hose, and my $11 HABBA vacuum gauge. Boiled some distilled water in a pot, maybe 4 oz worth, and poured it into a spray bottle, but they recommend something other than a spray bottle, I forget what it's called. It's like this humidifier kind of thing. Went really slow with very very little water at a time, because you can risk putting your engine in hydrostatic lock, and that could be disaster, and thousands of dollars. Put a stick on the accelerator and I think the car was at roughly 3,000 rpm, I've got no tachometer. Car was spewing smog as usual, until half-way through, and it slowly started to go away. I could not believe it. I didn't want to believe. I don't want false hope thinking this solved the problem, only to go fail another smog test. But I am going to get another smog check, and we'll see how that goes.
A lot of guys do the same thing with seafoam. I have no experience with that so I cannot say. Few guys have said they routinely use those fuel system cleaners, all sorts of brands, but this water treatment made the most difference. I don't know, I can't say. I really like Seafoam, and I wish I had another smoggy car I could try it out on. All I know is that my car has stopped spewing smog.
They say do the cheap things first. Don't throw parts at the car. Still learning. This was by far the cheapest thing I've done, lol. But I don't want to get my hopes up like I did last time. I might still be a gross polluter. Going to go get another smog check. Wish me luck.