Hi, it's been a while since my last visit couse of home inprovement issue's but I am stil alive and running the twin turbo engine.

At the last anual check the truck failed the smoke test by 350% !!.
Weird thing is, last year it has 1.25 K value???? some smoke messurement stuf.
This year 5.5 and later on 4, wile 3 being the norm.
Nothing has changed to the engine other then an 4L80E transmission to replace the TH400.

The smoke test is revving the engine up to the governour and keep it there for 1 sec.
The theory is to use the mass of the rotating parts for a constant load so the load is the same for every test on a particular engine.

With the new tranny I run much lower RPM's then before so I figgured old soot comming out, but drive 200 miles in 3rd did help a little from 5.5 to 4 but that is still 3 time more then last year.

So something else is wrong, right?

I think my fuel lift pump is poor and low feed pressure give more advanced timing and moor smoke, had this before a few years back but that was with the stock engine and loss off power.

Maybe someone can confirm my thoughts or have other idea's about this.
Neeles to say that fuel and air fiters are clean, intercoolers won't make a differance when standing stil.

Thanks, Peter