91 100 CIS-E III NF..stalling hot

[kneale at knitknacks.com]

I once had a P-car 911 that had a rotor in the distributor that had an
invisible crack in the strip of metal along the top.  When it heated up, it
separated.  No spark.

Original Message:
-----------------
From: Joshua Van Tol josh at spiny.com
Date: Mon, 28 Sep 2009 12:36:08 -0500
To: azaudi at gmail.com, quattro at audifans.com
Subject: Re: 91 100 CIS-E III NF..stalling hot


On Mon, Sep 28, 2009 at 11:54 AM, John Gourley <azaudi at gmail.com> wrote:

> *91 100 FWD NF engine with CIS-E III stalls at times when hot, especially
> when 100 degrees or higher ambient temp*.* won't restart until cooled
down*
> .............*full post at bottom of this message*
>
>
> Have you tried plumbing in a fuel pressure gauge positioned where you can
> see it from the driver's seat? That and a test light wired in parallel to
> the pump should tell you whether you've got a fuel pressure problem, and
if
> so, whether it's the pump, or the power supply to the pump.
>
> Joshua
>
> ===========================================
>
> Sounds like an engine speed sensor.  Gets hot and fails to provide a good
> signal to the ECU that allows the rest of the ignition system to work.
>
> Kneale
>
> =================
>
> Thanks for the ideas...................installing a fuel pressure gauge
> that
> I can watch while driving has been on my mind, and will probably end up
> doing just that.  At least would let me know if it is fuel shutting down
> that causes the problem
>
>
> I've been reading with interest the ongoing talk about speed sensors
> getting
> hot and causing problems............ My 2.3 NF engine doesn't have those
> sensors
>

Sure it does, probably in the distributor though. They can fail the same way
as the sensors mounted on the camshaft and at the flywheel. The technology
is very similar, just where the sensor is mounted, and what it's looking at
(distributor shaft vs flywheel teeth and camshaft).
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