Originally Posted by bebopsteve
No codes..no check engine light...just lots of sooty black & grey smoke and loud knocking
Sooty black smoke was an injector taking a dump (or likely several, possibly a bad FICM?).
Grey smoke is bad news. Seen this one before. There is a small chance you may have only blown the EGR cooler. But more likely considering the circumstance is a blown head-gasket. If the FICM goes, it can inject fuel during the compression stroke (and hence the knocking). The gets worse as the crush washers fail and dump even more fuel in. Either detonation, or fluid pressure (from un-metered fuel blowing past the crush washers) can stretch you head bolts.
Last time I saw this happen took only about 10 miles from first signs on black smoke to total head gasket failure that was so bad it couldn't build enough compression to re-start.