[Vwdiesel] Diesel Purge ..Miser's view

[Mark Shepherd]

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'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. Doesn't explain sudden but delayed deterioration
of economy etc. Can you really pinpoint the change... or is
it possible you just remember when you first noticed it?
Mark

----- Original Message -----
From: Gavrik Peterson <gavrik at cablespeed.com>
To: Mark Shepherd <mark at shepher.fsnet.co.uk>
Sent: Wednesday, May 11, 2005 5:07 AM
Subject: Re: [Vwdiesel] Diesel Purge ..Miser's view


> >Does it smoke on tickover or fast idling or just under
>load.
>
> When it starts cold it will smoke a little until it get
> half way warmed up. The real noticeable smoke is seen when
> driving. There are two situations when this happens.
> Sometimes it would smoke when just accelerating moderately
> at moderate engine speed. Every time it would smoke if you
> accelerate heavily at fairly high engine RPM. This smoking
> I am describing is very different from the engines
> behavior before it changed. I was always possible to make
> it smoke but this was at very high RPM and torque and it
> was less smoke then I am talking about above.
>
> I must stress that that after putting one can of Diesel
> Purge through the smoke seen when driving has been reduced
> to the point that I have not been able to observe it in
> daylight conditions no matter what I do. I have yet to
> perform the more sensitive test which is done at night
> with following headlights. I find it interesting that the
> Diesel purge treatment has not noticeably reduced the
> smoke on a cold startup.
>
> There is also the issue of how valid these tests are
> because the diesel Purge contains a cetane improver. Some
> of which is left in the pump and gets into the fuel tank.
> This may cause less smoke until I start with a fresh tank.
>
> >If all of above then maybe on tickover loosen one
injector >supply line at a time to shut each injector off at
a time.
>
> I already tried this after Val suggested it. The result
> was that when I removed each injector the engine slowed
> slightly and the smoke was unchanged -- the same for every
> injector. I only did this test at an idle. Perhaps I would
> have learned more if I had increased RPM. After performing
> this test I started to think that my problem was in the
> pump. At this point I still don't understand what is going
> on.
>
> What we need -- besides more knowledge -- is better
> instruments for testing these beasts. In the movie Das
> Boot
> there is an engine room scene where a crew member is
> checking the operation of the diesel. He goes along the
> engine opening a port on each cylinder and inspects the
> appearance of the jet of flame that erupts. I say we are
> not schteping mit Heinrich yet.
>
>    --  Gavrik
>