Re: *sigh*

[Nigel Heron <nigelh@connectmmic.net>]

At 01:02 AM 4/3/97 GMT, you wrote:
>Alas, I have figured out the deal with the mileage indicator, and it isn't
>pretty.
>
>Basically, your mileage is computed on manifold vacuum and vehicle speed. 
>Vehicle speed is taken from the speed sensor, and the manifold vacuum from a
>little vacuum sensor.  Both of these are contained in the dashboard -
>presumably, on the circuit board.
>

sorry mike but the vaccum line isn't for your mileage indicator (odometer).
i have the same car, '86 Scirocco, no air condition, no power steering, JH
8-valve engine. my car is mfa equiped (but my instrument cluster isn't, long
story...). that vaccum line is plugged up with a screw but the odometer
still works.

i took the spedometer/odometer assembly apart, and it's purely mechanical(no
vaccum).
my odometer stoped working too, it turned out to be a loose gear, i super
glued it back in place, which fixed the problem.

go to Jan's VW page (http://alicudi.usc.edu/~jan/cars.html) 
and pick up the speedo.fix file (http://alicudi.usc.edu/~jan/vw/Body/speedo.fix)
this file explains how to take it all apart and fix the odometer.


>If your mileage indicator isn't working, there are only two fixes.  Either
>the vacuum line is leaking or plugged, or the circuit board itself is broken.
> I pulled the vacuum line off today (and plugged the empty hole in the
>manifold, so the engine would run normally), and took the car out for a
>drive.  It still continued to give readings, which indicates there's
>something wrong with the circuit board.
>


the vaccum line is for some function of the mfa, which one i'm not sure!?!
i doubt it's the oil pressure, exterior temp, water temp, oil temp, miles
per hour, miles driven... what's left? could it be the gas mileage
indicator?, it's the only one that i can't find a sensor for in the Bentley
(i could be wrong though)



>In the meantime, though, this excercise gave me a chance to go over the
>vehicle's vacuum system and replace all of the little pieces of rubber hose
>(covered with some sort of cloth material for strength, one would suppose). 
>A mete of this stuff from VW was just over $10 - pricey, but worth it in the
>long run, I hope.  I was suprised how many of these little hoses in the
>engine were on the brink of falling apart.
>
>In the end, I have a happy distributor vacuum advance module, and a
>still-defective mileage gauge.  The next step from here is for me to actually
>pull apart the dashboard, and see if any of this is user servicable.  Likely
>not.
>
>-- Mike
>


nigel.
86 Scirocco 8v.

--
To subscribe or unsubscribe, send email to scirocco-L-request@privateI.com,
with your request (subscribe, unsubscribe) in the BODY of the message.