Tips on curing vapor lock?

[scott thomas]

Before I got my residual pressure set up, the car just wouldn't
start. I'd have to remove the air boot and lift up the sensor plate
(with the fuel pump running) until I heard the injectors scream. The
car would start right away. Now, it'll start, then die if I don't
rapidly blip the throttle over and over. Afterward, I have to wait a
few minutes before I can get it started. Weird.
---- Begin Original Message ----

From: "Livolsi, Stephane" <Stephane.Livolsi at investorsgroup.com>
Sent: Wed, 12 Feb 2003 09:31:03 -0600
To: "Audi Quattro List" <quattro at audifans.com>
Subject: RE: Tips on curing vapor lock?


I had the same problem, very hard hot starting, even with all afterrun
systems working properly.

I installed a momentary contact push button switch in the dash, wired
to the
grounding wire on the cold start valve.  Now, if I do have a problem
starting the car when hot, I press the switch while cranking which
gets some
fuel into the engine and it fires, which must lift the fuel meter
plate and
help clear the lines, because it will keep running.

The downside, is that, the way I have it hooked up, I have to use my
manual
switch for cold starting too.  This isn't such a big deal to me, and
I view
it as a sort of antitheft device - auto theft is a major problem here.

Stephane

> ----------
> From: 	scott thomas[SMTP:scott at dreamtheater.zzn.com]
> Sent: 	February 12, 2003 6:26 AM
> To: 	quattro at audifans.com
> Subject: 	Tips on curing vapor lock?
>
> I've tried a bunch of things to relieve my vapor lock and it's still
> bad. I keep fumbling with the residual pressure valve, but the fact
> of vapor lock still remains. In city driving, it's very noticeable,
> but mostly after sitting for 1/2 hour. I have to use "special"
> starting procedure to get the car running and purge the fuel ines
> with cooler fuel.
>
> I have my injector cooling fan running. I do use a lower temp switch
> mounted elsewhere. Afterrun works. The rubber boot for the hoses is
> there. I wrapped it with foil tape. It helped some, but not that
> much. Anyone been here before and what did you do? I'm going to try
> and shim the lines from the intake manifold with some silicone
> strips to see what happens. I can raise the residual pressure, but
> that'll leave me with harder starting, but the + is that it'll start
> every time.
>
> Any ideas?
>
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---- End Original Message ----




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