Re: 5KTQ Hotstart problem

["Fred Munro" <munrof@isys.ca>]

    It sounds like you may be getting vapour lock in the engine compartment
fuel lines. Running the injector fan may be cooling the lines enough to
condense the vapour and allow the fuel to flow.

    The root cause may be low fuel system pressure. Have you measured the
residual pressure in your fuel system? From what I recall, it should hold 45
psig if the check valve is in good shape.

HTH

Fred Munro
'91 200q  281k km

----- Original Message -----
From: Bruno Walter <brunow@thepentagon.com>
To: <quattro@audifans.com>
Sent: Monday, September 27, 1999 10:35 PM
Subject: 5KTQ Hotstart problem


> I searched the archives, but didn't find any messages with the same
> symptoms...  Most people's problems are after the car has been sitting a
> few minutes.
>
> As soon as I shut off the engine hot, it won't restart untill it's
> cooled down a bit.  It used to be about 15 mins, but it seems to be
> getting worse.  Today, after being parked for nearly and hour, with
> fairly cool ambient temperature (about 15C), it still wouldn't start.
> The intake manifold was still very hot to the touch.  I managed to get
> it started by forcing the injector cooler fan to run for a few minutes.
> As soon as it is cool enough, it starts immediately.
>
> The afterrun systems seem to be working fine, as the the injector
> cooling fan, and rad fan/coolant pump both run a few times after
> shutdown.
>
>