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Re: Hot Start Problem



The hot start relay basically causes the cold start injector to pluse once
every few seconds, dumping extra fuel into the intake.  Should help the
engine fire on warm restarts.  It doesn't have anything to do with cranking
speed.  If you did have an issue with cranking speed on a hot engine, I
would assume that the starter was getting heak-soaked, or the starter itself
was going.
Most California FI MK1's have a hot start relay wired in parallel with the
thermo time switch.  This allows the cold start injector to pulse even
though the thermo time switch isn't calling for it.
Of course, this is all for MK1 8V's.

Marc

----- Original Message -----
From: "Brian Haygood" <Scirious@hotmail.com>
To: "Scirocco-l" <Scirocco-l@scirocco.org>
Sent: Saturday, September 08, 2001 1:58 PM
Subject: Hot Start Problem


> I searched the archives, and I'm wondering whether a hot start relay will
> help this problem.  It's an '87 16v.  I've followed Bentley's checks for
the
> cold start injector and rest position of the air flow plate.  Once started
> the car always runs well and strongly.
>
>  My car's ability to start varies with temperature.  On colder days (70's
or
> so) it fires on the first turn or two.  When it's around the mid 80's it
> takes a several turns for a cold engine to fire.  If I drive the car
around
> a while (up to operating temps) on a warm day, and try to restart it
within
> about 5 minutes, it will start very reluctantly.  If I let it heat soak
for
> 30 minutes or so, it will turn over forever and never fire, though
> occaisionally it will sputter on the first crank or two.
>
>  I have tried push starting it twice and both times it started right up,
> though the cranking speed of the engine seems pretty good, and I can crank
> it for quite a while (10 seconds) without it slowing down.
>
>  So it sounds to me like something in their doesn't like being heat
soaked.
> The archives mention that putting a hot start relay in the ignition
> somewhere fixes a heat soak problem, but it sounded to me like this was a
> fix for cars that refused to turn over.  Mine turns over pretty well in
any
> condition.
>
>  I don't believe this is a fuel accumulator problem because it relates
more
> strongly to temperature than to time.  If the car is allowed to cool it
> starts well.  I have not checked the screw on the back of the accumulator
> for leaks, yet.
>
>  If anyone can verify that I need a hot start relay, could you also tell
me
> where to get the relay, where it wires in, etc.  Also, would this same
> problem disappear if I just replaced some wiring and didn't put in a
relay?
>  Thanks for your help, listers.
>
>  Sincerely;
>  Brian Haygood
>
>
>
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>
>


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