85 4kq hot-start pulse relay

[Ti Kan]

Aaron Thompson writes:
> I have been trying to solve my hot-start problems on my 85 4kq.  I
> changed out the fuel pump check valve, with no improvement.  The problem
> seems to now be the hot-start pulse relay (pg. 25-103 in the Bentley).
>
> What I am wondering, though, is the location of the relay.  I can't seem
> to find it in any of the circuit diagrams or relay layouts in the
> Bentley.  Also, does anybody know a diagnostic method for finding what
> exactly is wrong with the relay?

The 'hot start pulse relay' is only found on 1984 and earlier 4-cylinder
CIS models, either as a factory fitment or installed by the dealer
(in conjunction with a higher capacity fuel accmulator) to fix a hot
start problem that afflicted some cars.  In the 1984 wiring diagram,
it's referred to as the 'cold start pulse relay' (which is sort of a
misnomer, but it does function by pulsing the cold start valve if
sustained cranking doesn't start the engine).

This relay is not present nor should it be needed in post-85 models.

-Ti
2003 A4 1.8T multitronic
2001 S4 biturbo 6-sp
1984 5000S turbo
1980 4000 2.0 5-sp
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