Re: [T3] excessvie fuel consumption

["Russ Wolfe" <russella@prairieinet.net>]

Electrical noise gets into the ECU and gives it false signals. If you will
notice, the wires going from the generator to the regulator, run right under
the pressure sensor. The electrical noise on those wires, put a false signal
from the sensor to the ECU. The pressure sensor is main parts that control
fuel flow. The normal signal from the P. sensor is a VERY low voltage
signal, so noise on this effects the ECU the most.
My suggestion, have the generator rebuilt, with a turned armature and new
brushes. If the tops of the brushes close to the top of the brush holder,
they are worn too far. I think someone else on the "list" had this problem a
while back, with a bad armature. After repairing the generator, the problems
went away.

Russ Wolfe
russw@classicvw.org
http://www.classicvw.org/

Subject: Re: [T3] excessvie fuel consumption


> I have both arcing brushes and a 100w amp.  I'll take some emery to the
> armature and see what happens.  How does this affect the FI?
> Subject: Re: [T3] excessvie fuel consumption
>
>
> >
> > Subject: Re: [T3] excessvie fuel consumption
> >
> >
> > If grounding the sensor helped, check for electrical noise. This ground
> lug
> > was added back in '72/'73 to help with RFI (radio frequency
interference).
> > This was about the time that CB radios became popular. The D-jetronic
fuel
> > injection was VERY succeptable to this. VW added the lug to
eliminate/help
> > the problem.  A 100 watt CB amplifier would shut the early D-jetronic FI
> > system down. The RF would get in via the pressure sensor.
> > Check for worn generator brushes, (arching) sticking/noisey voltage
> > regulator, loose high current connections (bad wire conections at
> > generator/voltage regulator.
> > You don't have a big stereo amp in the car do you??
> >
> > Russ Wolfe
> > russw@classicvw.org
> > http://www.classicvw.org/
> >
> >
>
>

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