Audi 200: hot start problem...

[cobram at juno.com]

Tell him to check the fuel system.  Specifically residual pressure. 
While the symptoms you've described can be caused by electrical gremlins,
in my experience the culprits have resided in the fuel system every time.
 There is a detailed section in the Bentley on checking the fuel system,
and requires little more than a gauge and some fittings (which any decent
tech should have.)  If something is amiss on the pressures it's just a
matter of following the flowchart to figure out which component(s) is
(are) at fault.

Had the same problem a while back on the 200TQA, stumped even a seasoned
tech friend,  I finally traced it to a defective fuel pump check valve. 
It was the last thing I would have suspected, since it was only about 4
months old (came with new fuelish pump).

BCNU,
http://www.geocities.com/cobramsri/


Gerard <gerard at poboxes.com> writes:

> Someone wants to buy my ECU from me. Their mechanic dealing with the 
> car has decided that that is the fault.
> 
> Car starts fine when cold, runs perfectly apparently. Then switch 
> off when hot, let stand for a while, then try and start it again and it

> just won't. I did not confirm whether the engine cranks over at all,
but 
> I assume it does 'cos it apparently takes some time before it starts. 
> I can only think of leaky injectors maybe.

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