Can you elaborate on the ring washout problem and how to deal with it? Thanks!
Ring washout is a cylinder flooding situation, only in gasoline engines, where when the circumstances are just right, the rings will stick in their lands in such a way as the engine will have no compression, and thus will not start.
It happens generally in cold weather, if the engine is started and run for a very short period and shut off. Then later, when you go to start it, it just cranks like someone removed the spark plugs.
In order to overcome this, you need to floorboard the accelerator and force the ECU into a "clear flood" mode that most of them have, and crank the engine for a bit to clear the cylinders and get some oil sprayed/splashed up on to the cylinder walls again and free up the rings so that compression returns and the engine will usually cough and sputter and smoke and come back to life.
Some cars are really bad about this, it was far more common with older early EFI vehicles, but lately some newer cars (mostly Nissans, from my experience) run into this. My '96 Odyssey did it once to me, too.
In some extreme cases, you need to remove the spark plugs, clean or replace them, air out the cylinders with some compressed air, dribble a tiny bit of motor oil down the plug holes, crank the engine around a few times, put the plugs back in, and start the engine.
So if you start the engine in the cold, don't shut it off after 60 seconds and let it sit again for a few hours. That is *usually* the scenario that causes this.
Of course, the grand daddy of all of this situation, albeit called something different for obvious reasons, is the rotary engines. In their case, it isn't rings sticking since they do not have rings, but the apex seals. When RX7s were common, we would get a handful of those towed in every winter... sometimes the same car several times... and it was a bit more involved to get them freed up. Usually floorboarded cranking was not enough, and spark plug removal was needed. The rampant [normal] oil consumption of those engines made it worse, as the plugs were often so oil fouled that they couldn't provide the necessary gap for a spark to jump across anyway. And the smoke clouds those cars made when coming back to life was always a thrill, LOL.