got this from another forum, but this is waht this guy had to say....
start quote
"Typicaly", hot start problems (Hot, as in the fuel system has had time to heat soak after stopping, as opposed to trying to start immidiatly after stopping ) are becuase the fuel system won't hold is pressure when you shutdown when warm.
If fuel system pressure isn't kept up, fuel in the injector lines vaporizes easier when the hot engine is shut down, making the next start hard.
Fuel pressure dropping too quickly/fuel vapourization after shutdown can be becuase of any or all of the following:
1) Injectors leak
2) Accumulator is dead
3) Check valve at pump doesn't check
4) Injector cooling fan inoperative, or not pulling in cold air from down by the subframe
If that's too much to fix, I've heard of some that have wired a pushbutton switch to fire the cold start injector sensor. That lets you 'manually' force cold start injector to spray when hot. That will give some fuel for the motor to start on instead of vapours, and save your starter from getting trashed...
end quote
Thats what he had to say, but try going to this
site...
SJM Autotechnik, Audi Parts Specialist, 503-244-2834, Audi Quattro Parts, VW Parts, BMW Parts
Its got a ton of good info on....just scroll down to advnaced search and search your warm start issue. Hope this helps.