Re: engine dies on hot day

[John Graham <jgraham1@erols.com>]

Mark Zvolanek wrote:

> Hi everyone,
> I spoke to two mechanics about my engine cutting out on a hot day (30C+).
> One of them said it was common problem with 1991 Audi 90 cars, aparently
> lack of air flow through the engine bay can cause this. He thiks it's the
> vapor lock phenomena.
> The other mechanic said he had not heard of a such a problem, and that
> it's not a common problem, and since it only happend on a very hot day it
> would be hard to troubleshoot.
> I am stumped as to what to do.
> Last time it happened, I suspected the fuel pump relay and swapped it for
> another right on the spot but it did not help even though I heard the
> pump working while trying to start the engine.
> So far I changed fuel pump and fuel pump relay, but problem still occurs.
> When it happens I can heard the pump changing it's sound.
> Any thoughts would be appreciated.
> Mark Zvolanek
> '91 90

  I would check the ignition power output unit.
It may be going bad.


John.