Cold start injector on 87 CGT (KV)

[rob hod]

    Glad to have helped, but you're right, there's what they call a
thermo-pneumatic valve on the back of the head and you correctly guess what
it does. I must remind myself that my memory is not so good as I remember
it.

    Haynes manuals are a laugh in this kind of stuff, the one for my coupe
(605) mentions this system, and a test procedure for it, whilst the manual
for my 100 (907) has no mention of it. Both cars use the same system (not
turbo's or cis-3 variants though).

    Cheers

rob
----- Original Message ----- >
> Message: 6
> From: "Julian Stafford" <julian.stafford at virgin.net>
> To: <quattro at audifans.com>
> Subject: Re: )
> Date: Wed, 16 Jan 2002 20:37:48 -0000
>
>
> -----Original Message-----
> From: rob hod <rob3 at hod3.fsnet.co.uk>
> To: quattro at audifans.com <quattro at audifans.com>
> Date: 16 January 2002 19:28
> Subject: Re: Cold start injector on 87 CGT (KV)
>
>
> >
> >
> >    Julian,
> >
> >    If you look right next to the ignition coil you'll see a vacuum
switch.
> >It has a live feed from the idle switch (live when throttle *not* at idle
> >red/yellow wire for idle switch) and is wired to the cold start live
power
> >supply side. It's so designed as to only briefly conduct, thus giving the
> >CSV a brief spurt of power. There's no clever semicounductors involved,
you
> >might say its a vacuum/mechanical approach. It works at all temps.
>
>
> Thanks very much, that helps a great deal. For the last 10 years I've
> thought that vacuum switch was something to do with vacuum advance for the
> transistor ignition, silly me;-(
>
> One thing though, when the engine warms the CSV spurts stop. I notice that
> the vacuum line hook up goes via a little device screwed into the back of
> the head, at a guess I would say that this closes off the vacuum to the
> switch at a certain engine temperature?
>
> Regards Julian.
>
>