[T3] Thank You for your help!!
Jim Adney
jadney at vwtype3.org
Fri Sep 28 06:33:03 PDT 2012
On 28 Sep 2012 at 4:00, miah wrote:
> Well after a few hours of Volkswagen Yoga (Contorting to fit hands and
> wrists into small areas) I discovered three ground wires that have
> been floating in position. This provided the opportunity for my OCD to
> come out and play. So after some time of Clipping, Re-Capping, Shrink
> Wrapping, Labeling, Zip Tying and Tucking main wires¦ this somehow
> remedied the issue.
Okay, glad that's fixed.
> However after startup and driving around town the "Clicking" under the
> dash still occurs when I press the brake? I´m very curious as to what
> it is that I could´ve missed?
If this is really a '71, then I'm somewhat puzzled, as I've never
heard this symptom in those cars. My GUESS is that the click comes
from the TS relay, and is due to at least one ageing capacitor in
that relay. The click occurs when your TSs come on and this puts a
sudden extra draw on the electrical system due to the inrush current
to the tungsten filaments. The sudden current rush causes a transient
dip in system voltage, which the TS relay senses and one of the
contacts in there changes state very temporarily.
I THINK there's a capacitor in there which normally filters out those
brief transients, but that type of capacitor loses capacitance over
time and the filtering goes away.
In your '71 the TS relay is a black plugin box in one of the sockets
above the fuse box. If you unplug it and then try the brakes, that
should tell you whether it was the culprit. If it is, replacing it
MIGHT cure the click, but the problem might also be due to excessive
voltage drop due to a bad connection somewhere in your 12 V supply
path.
> By the way, Would a failed MPS cause the hesitation with acceleration
> and wavering Idle?
No. A failed sensor would stop the car. Please don't try to adjust
the sensor. Untampered '70-1 MPSs are getting expensive, and attempts
to "fix" them by readjusting almost always result in failure.
--
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************
More information about the type3-vwtype3.org
mailing list