[Vwdiesel] 92 ECO injectors

[Val Christian]

Based upon experience, I would go after glow plugs.  You'll probably find 
you have two bad.  I check them with a battery charger, and look for 
current flow.  An ohm meter is not reliable, because they fail by element 
erosion, which, like in an incandescent light bulb, causes a hot spot, but 
overall cooler operation.  (Hence the yellowish color of an old incandescent
lamp.  It's yellow, because it's cooler.)

Your injectors may also be a problem, and there are many who have played
with injectors here and will offer better advice than I.  My experience with
them is that they fail less often than glow plugs.  Generally timing changes,
dribble causing glow plugs to look as if they've been cut with a torch, 
lower power, smoking at temp, etc. are symptoms.

The white smoke you see is uncombusted fuel, which is from the cylinder(s)
which aren't firing up at the initial start.  Eventually, those cylinders
heat up from friction, and conductance from adjacent cylinders, and perhaps
partial combustion.  The noise is different, because you're not burning things
as usual.  Others can talk about that better than I, because they've played
with timing and injector settings, and know the different noises.

Is this a TDI or an IDI, as there will be some symptomatic differences 
between each.

Time to get the battery charger out, and a long screwdriver (the probe) and
check those plugs!

Val

> 
> How can you tell the difference between failing injectors and failing glow
> plugs?  I think I have one or the other, or maybe even both.  Not too
> mention MAF problems as well.
> 
> I'm currently running with the MAF unplugged until the new one comes in.
> But now in the morning, when the engine has been sitting for at least 8
> hours overnight and is cold, it starts but does so sluggishly.  Idling very
> rough until I step on the accelerator.  Then a nice cloud of white smoke
> appears.  After a few minutes, when the car has warmed up, it idles fine.
> 
> This past winter (2003) I would sometimes have to cycle the GP's two or
> three times for the car to start.  Didn't have to do that during the prior
> winter (2002).  Also, I'm noticing a very distinct noise near the fuel pump.
> A loud clatter over and above the normal diesel clatter.  It's hard to
> pinpoint the exact location.  But it's definitely coming from the top of the
> engine, on the passenger side, near the fuel pump and timing belt.
> 
> Failing GP's ?
> 
> Failing injector(s) ?
> 
> Failing fuel pump ?
> 
> Christopher J. Thornton
> 1991 VW Jetta 2 Door 1.6 Diesel - 242k miles
> 2000 VW Golf 1.9TDI (turbo diesel) - 108k miles
> AMSOIL Synthetic Lubricants Dealer #1098500
> http://www.amsoil.com
> 
> ----- Original Message ----- 
> From: "Scott Kair" <scott3491 at insightbb.com>
> To: <Audi-VW-Diesels at yahoogroups.com>
> Cc: <vwdiesel at audifans.com>
> Sent: Monday, August 09, 2004 4:51 PM
> Subject: [Vwdiesel] 92 ECO injectors
> 
> 
> >     My 92 ECO 1.6 sortaTD has been experiencing gradually decreasing fuel
> > economy and occasionally I see white exhaust puffs at startup after
> sitting
> > overnight. Fuel and coolant consumption is nil, and with 180k on the
> clock,
> > I suspect that it's time for new injectors.
> >     The ECO injector needles and tips list different part numbers from
> those
> > of conventional 1.6 TDs.  I've got some old VW promotional material that
> > says that the injector tips were changed in order to increase their
> > longevity.  Unfortunately, my usual suppliers can't locate any new or
> > rebuilt injectors, this model having sold only about 1000 units over 2
> > years.  My question is whether conventional td injectors would be
> acceptable
> > for use in this application.  Break pressure on the ECO injectors is the
> > same on either unit.
> >     TIA,
> >     Scott Kair
> 
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