Hard starting when engine and ambient temperature is hot.

[David Kavanagh]

I second the check valve idea. I had this on my '87 5KTQ. As a
workaround, I had a button wired to my fuel pump relay, so I could
initiate the ECU output tests. I found that if it wouldn't start, I
could fire the cold start injector with my button and it would start
after that. It was because the check valve didn't hold the residual
pressure in the system and there wasn't enough fuel on start. I ended
up replacing the fuel pump because it was noisy. The problem went away
(because the check valve on the pump was also replaced).

David

On Tue, 15 Jun 2004 19:49:03 -0600, Ed Kellock <ekellock at adelphia.net> wrote:
> 
> Fuel pressure check valve.  In the gas tank on top of the fuel pump.  I went in with a new one in hand and found that it was merely loose.  I replaced it anyway.
> 
> Ed
> 
> ============================================================
> From: George Harris <harchris at smokesignal.net>
> Date: 2004/06/15 Tue PM 07:39:55 MDT
> CC: quattro at audifans.com
> Subject: Hard starting when engine and ambient temperature is hot.
> 
> 
> 
> The patient is an '89 Audi 200 automatic non Quattro.
> 
> I have been unable to understand accessing the archives, so I appeal to
> the listers:
> 
> The patient runs strongly and smoothly once it is started. When cold it
> starts easily. It starts easily with a few seconds of turning over if
> started immediately after being turned off.
> 
> The problem occurs when the vehicle sits for up to an hour while it is
> hot outside. It has to turn over for a longer period of time as the wait
> lengthens.
> 
> We have a second Audi and many parts have been switched with no
> solution, and all tune up parts have been replaced: spark plugs,
> hi-tension leads, distributor cap, rotor.
> 
> I would appreciate any help in diagnosing this problem.
> 
> Cheers
> George
> 
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