My 2000 DB7 Vantage may have the coil pack failing symptoms...
32k miles, sometimes stuttering in D when at rest, e.g. stop lights and stuttering under acceleration between 1K & 2K revs.
This is infrequent and disappears when warm.
Or can exist during a short journey even after warm, then park up, turn off, then leave for a few mins and restart and its gone.
If I add techron at the gas station it fixes it and just tried an octane booster (Lucas) and that also fixed it today.
If it was failed coils would'nt it always be showing these symptons?
My fuel gauge needle is sluggish to read full after fill up so could this be a dirty tank or fuel filter issue?
Experiences please would be welcome
Just seeing this, I partially responded to your question in my post earlier but hear is a little more detail.. Could be fuel, could be Injectors, could be bad connections, coils etc etc..
My experience was as follows: The missing never went away whether warm or cold. Changing fuel, Fuel injector cleaner etc did not help it either.. Mine is a 6 speed manual so It would miss under low rpm situations, starting out, or pulling in 3rd 4th gear low rpm situations.. once I revved the car I didnt notice any missing. I just assumed that was because with 12 cylinders and higher rpm you just couldnt tell it wasnt firing on all 12. Also, I never had a check engine light or any codes.. Engine temperature , season, day, night, short, long trip etc never changed it. Once the condition started it always missed but got continuously worse. I drove it that way for about a year but finally got frustrated and fixed it.
These v12's essentially have separate fuel delivery and ignition delivery for each side of the engine. You can easily determine which side of the engine is misfiring at idle. just advance the throttle a little at the throttle body by rotating the spring loaded throttle backwards slightly. it will increase the revs on that side of the engine only. it should rev smoothly. Remember you are just revving one side of the engine.. If it doesnt rev smoothly obviously thats the side that has the misfire. test the other side the same way and see how the engine sounds.. FYI TIP! on the v12 the driver side fuel rail feeds the passenger side intake port and vice versa. Seems obvious to some but believe me not knowing that created quite bit of frustration for me when I replaced the fuel pumps but that is another story for another day..haaaaaa
Based on my experience it seems more like a fuel issue to me. it is very inexpensive to replace fuel filters (they are located in the wheel well on the driver side). There are also micro filters in the tank swirl pot but I would not attempt that unless you are replacing the pumps which is a bear! If you can narrow it down to one side of the engine there are lots of clever ways to test your injectors and clean them. They pop out of the intake with some gentle persuasion but you will need both the upper and lower injector rubber o rings when you re-install. You can get those from Scuderia really cheap.
Changing the coil packs is expensive and time consuming but can be done with basic hand tools and lots of determination. I completed the entire project on both sides of the engine over a long weekend. It made one hell of a difference! Parts were around 3k but thats replacing gaskets , spark plugs, upper and lower o rings etc etc. and I used only correct aston martin stuff. Personally I would try the fuel related stuff before I went down that path, Just my opinion..
Hope that helps.. fell free to ping me back if necessary.. best of luck