Help please. loud knocking w/ white smoke?

[tatkins85]

Drove my truck today and pulled up to a red light and thought i noticed some white smoke going passed my window, so i pulled over hopped out and looked under the truck and notice a little smoke coming out of that oil drain tube thing that just hangs under the engine?
I didnt think anything about it because the truck seemed to drive fine.
Got to the top of a bumpy/rocky hill and put the truck in park and noticed the engine was making a loud knocking noise and the exhaust had a ton of white smoke coming from it.
So i turned the truck off, and tried to restart it and it seemed to run fine, then about 1 mile down the road it started acting up again.
Kinda comes and goes but runs like crap more often then its not.
Anyone got any ideas?

about 8 k miles ago i replaced injectors with 5x16's, new electric lift pump, new turbo, also messed with the injection pump a bit.

tried unplugging the advance timing sensor thing under the ip and that seemed to help out a tiny bit but not much.

[ellis93]

Have you checked your water level? Might be the head gasket

[dazedandconfused]

My guess is head gasket popped or you have a crap injector starting to hang.

[skilletky]

I'm kinda thinking it's an injector. What does the exhaust smell like when it starts to white smoke? Check and smell your oil too.

[1992gen1_fan]

If the exhaust is a very rich raw fuel smell heres a couple things to check:
If its a non intercooled truck, make sure there is a good connection at the KSB. The connector could be loose, advancing the timing too far. If its intercooled (91.5-93) unhook the wire at the KSB for a while and see if it still does it. Too much timing can do this.
If its not a timing issue, probably a sticky injector. If you can catch it acting up, crack each injector line one at a time and listen for a change in the sound. If there is no change when you crack one, that injector/cylinder is the problem.

[Tacoclaw]

How long ago was your last fuel filter change? Have you drained the water drain on the bottom recently?

[KurtzN1]

Have you checked your oil? Is it milky or lighter than it should be? Same with the coolant fluid.