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Car Forum / Volkswagen / Water Cooled Volkswagen Cars / September 2008

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A1 Tach question 1984 GTi Rabbit

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Tube Audio - 24 Sep 2008 19:27 GMT
Hi

I have a 1984 GTI Rabbit.

For the past few months sometimes when I start the car, the runs poor and
the tach does not work, it stays at 0 rpm.  Usually after about a minute the
tach starts working and at the same time the car runs fine.

Yesterday the car wouldn't start, I noticed while cranking the started that
the tach did not move during cranking?  Should the tach move via cranking?

I need to investigate but I have a feeling in might be a intermittent
contact, I need to look at the schematic but I recall that there are 1 or 2
relays that deal with the tach and the cis system.  Perhaps a relay is going
bad?
Craig - 24 Sep 2008 23:12 GMT
Sounds more like an issue at the coil.

Craig

> Hi
>
[quoted text clipped - 12 lines]
> 2 relays that deal with the tach and the cis system.  Perhaps a relay is
> going bad?
Jim Behning - 25 Sep 2008 02:16 GMT
Clean the electrical connector that attaches to the distributor.I
think it has 3 wires.  I used TarnX followed by a distilled water
rinse, then blown dry with an air hose and then a bit of grease to
reduce the chances on corrosion happening again.

>Hi
>
[quoted text clipped - 11 lines]
>relays that deal with the tach and the cis system.  Perhaps a relay is going
>bad?
dave AKA vwdoc1 - 25 Sep 2008 03:57 GMT
do the idiot lights say lit?

> Hi
>
[quoted text clipped - 12 lines]
> 2 relays that deal with the tach and the cis system.  Perhaps a relay is
> going bad?
 
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