[Vwdiesel] Diesel Purge ..Miser's view

[Gavrik Peterson]

>Do you have access to a rev counter? Grab one from a 
>dead truck if not. The rev counter can be used to >supplement the injector tests to see if any have a >different effect from the others.

I agree that more instruments would help. With my history
of fooling around with electricity I have gotten used to 
needing instruments to observe things that are either not 
visible to my senses or too high voltage for my fingers. 
But, I know that talk like this will make Hagar think that 
I have gone over to the dark side.

>I'm also wondering if the refurbished/new injectors have >become more efficient in getting fuel across so a slight >backing out of the fuel volume screw might be required.

Not sure what all changes with rebuilt injectors. In the 
case of my problem, the smoke started five months before I 
finally changed the injectors. The rebuilt injectors did 
not noticeably change the smoke or fuel consumption. The 
interesting thing is that the injector shop reported that 
3 of the 4 injectors showed poor spray pattern. This lead 
me to think that the real problem is much more significant 
then a poor spray pattern. It also is possible that the 
injector shop was full of it.

If I correctly understand the 'fueling screw' function, 
the smoke I am seeing (except at full acceleration) would 
not be effected by this adjustment because the 'fueling 
screw' does not change the amount of fuel injected -- only 
the maximum amount.

Another thing is that I get high fuel consumption on long 
constant speed freeway trips where the pump is not at full 
injection volume. If the 'fueling screw' was adjusted so 
that the amount injected was limited when driving on the 
flat at 60mph I would have nothing left for acceleration 
or hills.
  
>Can you really pinpoint the change... or is it possible >you just remember when you first noticed it?

Thought I could, but my experience tells me that I can 
fool myself.

My records show that when I fueled up after a trip up to 
Hagars place I had gotten 49.03 mpg. This was before any 
of the symptoms we are discussing appeared. On the next 
fueling I had gotten 39.8 mpg which is OK for mostly city 
driving. It was while driving on this load of fuel that I 
noticed the smoking. After consuming this tank of fuel the 
mileage was only 36.02 mpg. I had never seen anything this 
low before. This change in engine behavior happened within 
around 500 miles.

   --  Gavrik