Nice mileage! mine is a yongue pup with only 145Kmi!
Ive been of the impression that the problem is that modern Gasolene
vaporizes at a lower temperature and the fuel system gets vapor lock when
hot and is sure acts that way but Im up for any other opinions.

Ive done a tuneup but nothing else has ever been replaced, the idle mixture
was adjusted but that didnt help the hot start problem.

in 553K have you had to do any drivetrain work??

Keith
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>
> My '87 Golf with CIS has been doing basically the same thing
> for 6 or 7 years. My car has 553K on it now, this started back when
> the mileage was back in the 200K range.
> It starts and idles fine when cold. Once warm it will start
> and idle OK only if it has been sitting for less than 5 minutes or so.
> If it sits longer than 5 mins it starts fine but runs really crappy
> due to a rich mixture (a very rich mixture gives the exhaust a
> distinctive smell). It will idle fine if I either let it fast idle
> (foot on the pedal) for a minutes or so or start driving it for a few
> seconds.
> It has done this despite a new fuel pump, new fuel pump check
> valve, new injectors as well as a different (used) warmup regulator,
> frequency valve and ECU. I've come to the conclusion that the fuel
> distributor is a fault, mainly due the fact that it is the only fuel
> injection component not yet replaced. I have a rebuilt one ready to
> install, just haven't got around to doing it yet.
>
>
> Todd
> Seattle,WA
> '86 GTI, Red of course. (exciting racey car) 261,000 miles
> '87 Golf, Polar Silver. (boring work car) 553,000 miles <- Yeah, baby!
> http://www.pureluckdesign.com <-Ferrari & VW stuff