One more thing. You said:
"On start up without gas the car will die".
Keep in mind that on a fuel injected engine, all you can do is add
more AIR by steeping on the gas pedal. The ECM adds more fuel
when it sees an increase in air flow & gas pedal movement.
Viewing engine sensor inputs when cold, would help you a lot to
possibly determine what is going on.
You can also try do disconnect the MAF sensor (Air Mass Meter #8) to see if it is
possibly at fault.
Keep in mind that any sensor you disconnect, will set a trouble
code that you will have to clear. But that's OK, you are simply
looking for something at will improve your "cold start" operation.
You may have to wait until the following morning to see if there
is a change for the better.
If all else fails, leave it at a VW Service Shop over night and
ask them to only spend 1/2 hr max on diagnosis. Since it runs
fine after a few minutes of initial start up, they probably won't
find anything either after that time because the window is just
Vacuum leaks, fuel pressure, dirty injectors. All can cause issues
such as you listed and can be eliminated / ruled-out as the cause
with the right tools / equipment.
Sunday, October 14th, 2012 AT 3:44 AM