[s-cars] //Sbitch hard to start when hot

[Mark Strangways]

Ohh how VERY familair...

Since I have a mounted fuel pressure guage on my rail I can see pressure (at
least now)
What prompted all this was exactly what you desribe.
I found that the check valve at the fuel pump was stuck open, a bit. This
would allow the fuel pressure to drain down and result in this hard to start
situation.
I guess there is some setting in the ecu that expects there to be enough
fuel pressure in the system to fire the engine before it (the ECU) turns on
the fuel pump.

I blew a weee bit of compressed air down the supply hose to dislodge any
particles, worked fine after that.

HTH's
Mark S
----- Original Message ----- 
From: "Vincent Frégeac" <vfregeac at sympatico.ca>
To: <s-car-list at audifans.com>
Sent: Friday, June 23, 2006 10:56 AM
Subject: [s-cars] //Sbitch hard to start when hot


> Hi all,
>
> My "beloved" S6 have developed another reason to keep my week-ends busy.
> When I stop the car for 5 minutes, it takes a loooooong time for the
engine
> to start again, like 10 or 15 seconds on the starter (Count them, it's
very
> long when your starter is running and you hope the battery will hold).
After
> 1 minute, it's not so bad, after 30 minutes too and no problem after 1 or
2
> hours. 5 minutes is really the shit spot. I've also noticed that it's a
bit
> better when I hold the go pedal to the floor before starting. This made me
> suspect a leaking injector that would flood the cylinder within 5 minutes,
> then the cylinder drains in 30 minutes. But the engine should start, rough
> but start, on the 4 remaining cylinders... except if I have 3 or 4 leaking
> injectors.
>
> So, I'm stuck scratching my head in an attempt not to replace half the
> engine bay to discover that a 5 minutes 10$ repair would have been just
> right.
>
> Any idea?
>
>
>
> Vincent.
>
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