Again a typical case of vapour lock. Fuel pressure drops off too quickly.
The fuel system should hold the pressure (about 14psi) for at least
20..30min. Check for leaks and if it's a cis injection replace the o-rings
of the fuel pressure regulator located in the fuel distributor.

SFC

"JH" > schreef in bericht
oups.com...
> Regarding my recently aquired 84 VW Rabbit GTI - manual trans - 8
> valve.
>
> I have read posts regarding topics relating to hard, hot starts but
> have some additional questions.
>
> The car starts fine when it's completely cold, but takes quite a lot of
> cranking in order to get it to start when the engine is hot. I checked
> the cold start injector and found that it is working as it should on a
> cold start (sprays for about 8 seconds, then stops). However, the cold
> start injector does not operate at all on a hot start. The car does a
> "hot start" when I manually put 12 volts to the cold start injector for
> a few seconds while a helper starts the car.
>
> The other posts suggest that the failure is in the "hot start relay".
> I can not find a hot start relay on the car, or referenced as a part
> for this car. The only thing close is the CIS/Lambda relay. Is that
> it?
>
> I am about ready to add 12 volts directly to the cold start injector
> via a switch or, timer relay.
>
> Any suggestions?
>
> Thank you in advance!
>
> Jeff
>