1984 4k - no start

[Bares, Vittorio]

Well the car starts and runs. After its warm though, it no longer starts. Today it would need to sit for just a few minutes before it started again.

While running, I can tell it isn't running well on the low end.

For the no-start the O2 sensor may make sense as it seems to have trouble after warm up.

For the not running well - I'll take a shot at the DPR.

Now to your comments - I thought the DPR was the assembly directly over the fuel meter arm sitting on top of the airbox. Which is the fuel distributor?

Vittorio -

-----Original Message-----
From: Tony Hoffman [mailto:auditony at gmail.com] 
Sent: Saturday, September 19, 2009 5:33 PM
To: Bares, Vittorio
Cc: Ben Swann; quattro at audifans.com
Subject: Re: 1984 4k - no start

Pull it off the side of the fuel distributor, and spray carb cleaner
or brake cleaner in through the holes in the side. DO this to both the
DPR and the holes in then fuel distributor. BTW, have you done all the
checks for spark already?

Tony

On Sat, Sep 19, 2009 at 4:28 PM, Bares, Vittorio
<Vittorio.Bares at nuance.com> wrote:
> Hi - back to the 4k now that the S6 is running well.
>
>
>
> The DPR - are you suggesting opening it up and cleaning it? Just want to
> be sure before I do since ETKA doesn't have an exploded view of the
> internals.
>
>
>
> Thanks!
>
>
>
> Vittorio -
>
> ________________________________
>
> From: Ben Swann [mailto:benswann at verizon.net]
> Sent: Tuesday, August 04, 2009 9:38 PM
> To: Bares, Vittorio
> Cc: quattro at audifans.com
> Subject: 1984 4k - no start
>
>
>
> Vittorio,
>
> Test the Hall sender with a VOM - you should see it go ~4V to < .5 V as
> it goes in and out of window.  Ref. Bently for procedure.  You may have
> compound problem, so get spark first.
>
> If the DPR (differential pressure Regulator) is dirty/cruddy/rusty, it
> will create a blockage and no start.  You can remove for cleaning. Get
> DPR O-ring kit from dealer.  A light cleaning with very fine emory paper
> 800 grit or higher may help.  Clear any blockage in port orfices with
> carb cleaner ( wear safety glasses).
>
> O2 sensor! Will cause poor running as you describe and even stall the
> car, but usually problem happens after engine is warm and goes into
> closed loop.
>
> Rule out Fuel Pump relay by jumpering  - can use orange relay to simply
> have fuel pump turn on constant with key. - use for diagnostics only.
>
> Ben
>
> [Date: Tue, 4 Aug 2009 10:42:59 -0400
> From: "Bares, Vittorio" <Vittorio.Bares at nuance.com>
> Subject: 1984 4k - no start
> To: <quattro at audifans.com>
> Message-ID:
>        <624BC75DA4460545849070E141EBCD6B05926631 at BN-EXCH01.nuance.com>
> Content-Type: text/plain;       charset="us-ascii"
>
> So, has new wires, rotor, cap, plugs - was running fine - then about a
> week ago, while driving it - it just stopped running.
>
> I cleaned the contacts on the coil - started again, but wasn't running
> well. Almost as if it was running on 4 cyl (it is a quattro 5cyl :-)). I
> was trying to diagnose by pulling one sparkplug at a time while it was
> running, not much change when I did so - consistently for all 5 plug
> wires.
>
> Pulled the plug on the temp sensor in the rear of the head - no diff.
>
> Pulled the plug on the sensor that is on the fuel distributor - no diff.
>
>
> This morning - no start...
>
> No spark.
>
> I'm thinking hall sensor??
>
> Vittorio -]
>
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