FourG

Alright here it is when my car is ice cold it starts when its hot it starts but after it sits for a hour or after it cools down a bit it wont start anymore unless i jump start it have any ideas

Katman

"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...

urq20vt

more on that issue.

Ringnalda

Sounds like you may just need a beefier battery, if it currently works with a jump-start. By that I understand an additional power source; not a 'Bump-Start' where you push it and pop the clutch!

luckyxie

I have the same problem on my 2002 A6 2.7T, did you get it fixed? please let me know so I can have a ideal.