I have very much appreciated your comments. It helps me to talk out a puzzling problem. Especially since I was convinced this engine was GDI. You know, when I got things completely wrong. Lol

The problem isn't too bad. It only runs rough in idle and only when it warms up which is a few minutes. I smell gas when I start it. And it's not real bad, like stalling. ...Yet. Its just real annoying with the engine light and one code.

I took it on several highway drives.

I may get one of those scopes. I'm very interested to see inside. I could see it helping me in other situations too. Have been very frustrated fishing wires in a wall. A camera never occurred to me, lol

I don't feel real motivated on my day off here to go probing around. I've been prodding around that thing for some time now. Uhg

 

Make sure you get one with a light. My harbor freight one is close to worthless.

 

Yeah the shells were blasted into the back of the valves to clean the.
If you have ever changed a head gasket that was allowing water into the cylinder when you take the head off you have no problem identifying the offending cylinder(s).as they will look like new.
We used to pour about a gallon of water through the engines to clean out the carbon. Once you have it running at high rpm's you just feed it the water and let it blow the carbon out. The water explodes and the shock breaks up the carbon. You want to feed the water in at a rate that just effects the engine but not enough to stall it. If you do this you MUST drop the exhaust or you will be replacing the cat and possibly the muffler as well.

 

Neat trick. But I bet too much water and you’ll break it faster than you can say”hydrolock.”

 

In a direct injection engine, I doubt the water trick would be beneficial to cleaning the intake valves or the oil control piston rings , but if you’re a gambler , and can afford a new engine …..

 

Done this for years with everything from lawn movers to big block engines. You don';t dump the water in but you can run a good stream with even a small displacement engine.

 

It does not clean the back side or stems of the valves. It will clean rings.

 

I would actually try this, terrifying as it might be. Livin’ on the edge!

I presume you would change the oil immediately after? Or can you count on the water being vaporized and not emulsifying with the oil?

They used to sell water injection systems. The claim was that the water catalyzed oxidation and lead to more complete combustion. I’ve heard plenty of people claim their car runs better on rainy days.

 

I have done it on an air cooled VW. No cataclysmic results. You don't pour water in, just a dribble, it gets atomized and out the exhaust.
I don't know if it did any good.
Drizzling diesel cleans the innards the same way snake oil does. If you read the label they are "petroleum products" and "jet fuel" i.e: desulfured diesel.

 

We always change oil after. You don't need to worry about ruining your engine so long as you don't dump the water in. Take it to 4500 rpm or the rev limit and feed it in slowly at first and keep adding until it effects engine performance. The engine should run kind of crappy while doing this. Run at least a gallon through. Some guys will mix the water with Mystery Oil. Don't know that it makes any difference.