So my 2001 Audi AllRoad (2.7t Quattro A6 Avant basically) is more or less fully re-assembled, and I am trying to wrap up its issues before the weather gets too nasty.
One issue it has is it seemingly randomly has a hard or no start, where it just cranks and cranks but doesn't start. Sometimes it seems that a dab of the throttle seems to help, and it seems to happen commonly while low on gas, or shortly after a fill-up. It seems to happen more commonly on cold start, but happens while still warm as well on occasion.
Today it full on stalled out at a stop light, and again as parking while nearly completely empty.
The CELs it has are all emission control related, which would not point this at a sensor failure. I also don't think it's wiring or power related, especially after it cutting out today at a light while super low on fuel, and again as I came to a stop parking.
It has not cut out while under load, or experience any kind of miss.
Leaves me thinking Fuel Pressure Regulator, Filter, or Pump.
The filter I'll try tackling tomorrow as its cheap insurance and I have no idea when it was last done, and I will take a look at the pump since it has a fairly easy to access panel, but as its so randomly intermittent, and doesn't have issues under Load AND I hear it prime and it's not making any loud or 'bad' noises it makes me think FPR since that's tied to Vacuum, which may be related to some of my emission CELs?
Thoughts? Things to test/check?
One issue it has is it seemingly randomly has a hard or no start, where it just cranks and cranks but doesn't start. Sometimes it seems that a dab of the throttle seems to help, and it seems to happen commonly while low on gas, or shortly after a fill-up. It seems to happen more commonly on cold start, but happens while still warm as well on occasion.
Today it full on stalled out at a stop light, and again as parking while nearly completely empty.
The CELs it has are all emission control related, which would not point this at a sensor failure. I also don't think it's wiring or power related, especially after it cutting out today at a light while super low on fuel, and again as I came to a stop parking.
It has not cut out while under load, or experience any kind of miss.
Leaves me thinking Fuel Pressure Regulator, Filter, or Pump.
The filter I'll try tackling tomorrow as its cheap insurance and I have no idea when it was last done, and I will take a look at the pump since it has a fairly easy to access panel, but as its so randomly intermittent, and doesn't have issues under Load AND I hear it prime and it's not making any loud or 'bad' noises it makes me think FPR since that's tied to Vacuum, which may be related to some of my emission CELs?
Thoughts? Things to test/check?