D4 7u smoking and more distinct popping

1/8 inch out of adjustment is a lot and on number two to boot. i would guess that the valve seat on number two is burned.😖uspicious:

Any way to fix that easily?

Requires pulling the head.

Any special tools? Have you done it?

I wonder if it's just rust and gunk built up on that one and if I can spray something like penetrating oil to get the stuff off so it will seat right?

You could give that a shot and you could also remove the manifolds and dink around in there to see if you can see anything, but if it's a burnt valve seat, the job is typically handled by an engine rebuilder, who would cut the old seat out and fit a new seat and valve, and lap it. Requires sending the head in to the rebuilder

Would it work and not hurt anything to spray something like sea foam or another type into the precombustion chamber to see?

sea foam is great for cleaning up carbon. i agree that you can take off the manifold to see what you can of the valve. then you can spray sea foan deep creep directly on the valve.

sea foam is great for cleaning up carbon. i agree that you can take off the manifold to see what you can of the valve. then you can spray sea foan deep creep directly on the valve.