[V8] Replacing the Speed Position Sensor

[bob moy]

If the speed sensor should fail while the engine is running then the engine 
will stop.  If you crank the engine you will also notice the the tach will 
not bounce while the engine is cranking (Dead speed sensor).

For peace of mind change both sensors together.  Both sensors are held in 
place with a bracket and offset.  The one more toward the engine is the 
crank position sensor and the one closer toward the transmission is the 
speed sensor.


Enzeder enzeder at comcast.net
Sun Jul 11 19:41:45 EDT 2004

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I just ordered and replaced both of mine figuring that I'd hate to repeat
the process if I only replaced one, then the other failed.  Went to my
local Audi dealer and ordered them - about $180 each.  They arrived next 
day.

According to a manual I have, if they fail, the car shouldn't start (my
problem).  It goes on to say that if the reference sender should fail while
the car is running, the car will continue to run using a reference value
stored in the ECU.  No mention of what happens if the engine speed sensor
fails while driving.

Replacing both fixed my no start condition.

Later,
Arryn


At 10:33 PM 7/10/2004, Kneale Brownson wrote:
>The black one is 077 905 381, ignition timing sender.  The gray one is 077
>905 381A, engine speed sensor.  They are identical except for the color of
>the plastic on the connector and at the sensor head.  Reportedly, the black
>one is NLA.  I couldn't find one a year or so ago when I replaced mine.  So
>I installed two of the gray ones and put black electrical tape on the one
>that went to the black connector in the wiring harness.  They're such a
>PITA to get to, I figured I should change both if I was going to change 
>one.
>
>No idea whether either fits the symptoms you describe.  One causes the
>engine to be hard to restart when hot (the one I wanted to change first)
>and the other causes the tach to drop to zero, which I guess would indicate
>a dying engine, eh?
>
>At 07:53 PM 7/10/2004 -0600, Eddie Dial wrote:
> >I cannot tell which sensor is the speed position sensor and which one is 
>the
> >crank position sensor can someone help me please.
> >
> >
> >
> >Also the reason I am replacing the sensor is because it died once when i
> >came to a stop and it dies when I go from Drive to reverse or vice versa. 
>Am
> >I replacing the right sensor?
> >
> >
> >Your help is freatly appreciated
> >
> >THANKS!
> >
> >ED



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