[V8] Failing Speedo - Sensor p/n?

[dsaad at icehouse.net]

On my 5-speed at least, R&R of the sender is easy.
Testing is also easy (as previously described) except that you have to expose
the wire somewhere. It makes the most sense to remove the dash pad and probe the
wire on the terminal of the speedo. This makes sure that all interconnects from
the sender to the speedo are good - but it is a bit of a PITA to get all set up.
As I said, I soldered on some test wires and drove around for a few days with a
frequency reading volt meter on my dash.


Dave


Quoting "Buchholz, Steven" <Steven.Buchholz at kla-tencor.com>:

> ... mine too ...
>
> The thing is that I don't think there's a good way to test a flaky sender
> other than replacement, and I know they are quite expensive.  For my money
> I'll go through the effort of pulling the IC and applying a good coat of
> DeoxIt to the pins ... and I'm also going to look for the bad solder joints
> as Ingo found on his.  Then I can put it all back together and see if the
> speedo fails again ... and at that point I'll pony up for a new sender ...
>
> If you have more than one car available I suppose you could swap senders
> between two cars to see if the problem moves.  You might also be able to
> identify a problem with the one as you remove it.  I don't know how tough it
> is to R&R the sender though ...
>
> Steve B
> San José, CA (USA)
> >
> > YES - my odometer also quits working, as well as the cruise control and
> the
> > computer goes nuts.  Does this tend to point more towards the IC, or more
> > the sending unit?
> >
> > -----Original Message-----
> >
> > Does your odo quit at the same time?
> >
> > -----Original Message-----
> >
> > .... I'm seeing some odd speedo behavior on #344 too ... very weird ... it
> > works fine most of the time, but all of a sudden the speedo drops to -0-
> for
> > some period of time and stays there.  It seemed to be most consistent if I
> > took the car for a short errand run ... when leaving the place I'd have no
> > speedo ... but I see it mid trip on longer runs too ... after a minute or
> > two the speedo comes back.
> >
> > I had convinced myself it was the speed sender in the tranny because the
> > trip computer was showing zero speed as well ... but upon further head
> > scratching I realized that the speedo is likely to be sending the signal
> to
> > the trip computer ...
> >
> > I'd say that before plunking down the bucks for a new sender that you do
> > some tests to eliminate the instrument cluster as culprit.
> >
> > A very long time ago there was a V8 lister who claimed to have schematics
> > for the V8 IC ... boy, I would really have loved to get copies of them!
> >
> > Steve B
> > San José, CA (USA)
> > >
> > > I have a failing speedo (dropping to 0, then springing back up).  I
> > suspect
> > > it's the speed sensor.  Does anyone have a recommendation (other than
> the
> > > dealer) for a new sensor?  Any known partnumbers?  Thanks!
> >
>
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