Re: hot start MB problem

[C1J1Miller@aol.com]

Another data point, Phil, out of the archives (I ran across it while looking
for something else...)
==========
<<<From: Philip Ross <rossp@blythswood.org.uk>
To: "'Quattro List'" <quattro@coimbra.ans.net>
Subject: Ur quattro injector fan and oil cooler
Date: Thu, 1 Aug 1996 10:26:25 +0100

Someone asked about the Ur quattro injector fan. 

I find that if I drive fast on twisty roads (not motorways) the fan
often comes on intermittently for about 20 minutes after I stop.
It is distinguishable from the radiator fan because it is quieter
and more intermittent.  

An Audi dealer cut a hole in the middle of my injector fan vent 
because seemingly they were modified in 1986 as they were 
only trapping hot air around the injector instead of cooling them 
down.  So if you don't have a hole in your blower - then perhaps 
you should make one or buy a modified part.

I've also had another problem with my Ur quattro fixed recently.  
My oil temperature was going up to 130 in normal driving and
as high 150 on the autobahn.  This was because the oil cooler 
was not working - the pipes and cooler were stone cold.  The 
problem turned out to be a sticky thermostat in the oil filter housing.
A bit of cleaning fluid had it moving freely and the oil cooler is now
piping hot with my oil temp nice and cool.

Philip Ross
Edinburgh
Scotland

Ur quattro
200 avant quattro x 2
V8 quattro (thankfully about to be sold)

Date: Thu, 1 Aug 1996 10:43:30 +0100

Steve Buchholz wrote regarding the injector fan "I wouldn't be 
too worried if mine did not work, I don't believe that the blower is
meant to protect anything in particular, simply to reduce the 
likelihood of hot start problems."  Someone else said they
had decided to remove it.  

My mechanic who was an Audi workshop foreman and latterly
a mechanic with the Audi Sport rallying team told me
that they fitted these things not only to cool the injectors but 
because on some early cars the injectors were popping out
under high pressure!

Philip Ross 
Edinburgh
>>>
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In a message dated 97-11-17 16:17:05 EST, quk@isham-research.demon.co.uk
writes:

> > 
>  >> Mine is becoming very hard to start if it's parked more than an hour 
>  >> with the engine _HOT_.  No problem if it's cold, or if it's 'just warm'
>  >> from taking 'er indoors to work.  But if I do a hot run and 
>  >> park it for an hour, it's a real sod to get it going again.
>  
>  > Seems like the injector cooling fan isn't running (if there is one
fitted,
>  > that is).
>  
>  Yes, has to be the favourite.  Even when it starts it only runs on two 
>  pots for the first few seconds.  Grounding the connector runs the fan, but
I 
> 
>  haven't heard it run on its own for ages. I've now got the thermoswitch 
>  suspended in a fan oven with leads coming out to a multi-meter -it still 
>  switches, but I think at a much higher point than the specification 85C.
>  
>  I'll try replacing it.