[Vwdiesel] rabbit smoke revisited

Kris krisa at subtend.net
Thu Sep 19 02:22:31 EDT 2002

On Thu, Sep 19, 2002 at 01:39:26AM -0400, LBaird119 at aol.com wrote:
>   I'm sure we asked this but I sure don't remember.  What color is the smoke?
> White, gray or black?  White is unburned fuel.  Timing, massive overfueling,
> poor compression, burning antifreeze.  Gray smoke, excessive:  burning oil,
> bluish gray, poor compression, generally poor engine condition or fine
> condition under full throttle.  Of course then it's not really excessive.
> Black
> smoke:  Partially burned excess fuel.  Poor compression, possibly timing,
> bad but not hideous injector, pump volume delivery set too high, dirty air
> filter, possibly even dirty fuel filter (pump pressures out of whack).  Black
> smoke nearly always happens under load or near full throttle.  Otherwise
> the engine will achieve a higher rpm to equalize.

I would probably say grey-black smoke.  Both at idle and a huge plume at full
throttle (which is where it was at most of the trip because of my 35Mph
top speed to get it to the shop).

The fuel filter is new (as is delivery tube from filter to pump).  The
air filter is new.  I cleaned the injector lines.. new rebuilt

Can the engine run with the pump off by 180o?  I could see myself doing
this when I tried to time it up the multiple times I tried.  The
delivery screw on the top... you can tell it wasn't tampered with
because it has that yellow marking paint sealed across the screw and the
screw slot (broken if moved).
If they don't find any issues with the rebuilt injectors, I will ask
about the pump being off by 180.

Also, this was the first time I have ever replaced a head gasket.  I
followed the Bentley instructions.  Is there anything I could of screwed
up?  New head 12-point bolts.. tightened in correct order.. correct
2-notches like the old gasket.

>   So why should the pump be bad then?  I set mine wrong the first time
> I set it on the 5000TD.  Things were really off and bad.  I thought I'd
> messed up the pump.  It turned out it was 180 off.  I called Seattle
> Injector and he strongly reassured me there was NOTHING I could
> have done to the pump!  He said to think of these pumps like you
> would a hammer.  It's REALLY tough to damage it!  Things can
> happen but the pump is not the most likely thing to fail.  It's the
> least likely.

The engine ran great before I mucked with everything. :)  So I'm pretty
sure there isn't a problem with the pump.

I'll relay some of this information back to my tech after he calls about
the injector testing.  I'll keep you people posted. :)
I'm just a packet pusher.

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