Join Date: Aug 2009
Location: Minneapolis, MN
Thanks to everyone for their insight and advice. I agree that the rather sudden and short hesitation at higher rpms makes an electrical system the most likely source, so I will focus my diagnosis on the electrical system. I changed the coil about 4 years ago, which doesn't seem all that long for a coil to become faulty. But I guess age doesn't always correlate with equipment failures. The high test leads were new about 9 years ago; I'll double check the rubber boot positions and all connections for the distributor to the spark plugs, grounding wires, etc. I like the idea of checking for sparks to ground in the dark, something I can look for tonight. I always run with my headlights turned on for safety.
Everyone's comments about the cold start jets were also quite helpful. I will look into changing over to 50F11 or similar sometime soon. I was always curious as to why I need the hotter BP5ES plugs to keep from fouling; the richer mix due to the idle jet setup seems like a plausible explanation. I'm driving my Spider to the AROC Convention next week, so any carburetor changes may have to wait (I hope!) until my return to Minneapolis.
'67 Duetto (white w/red)
'02 BMW 330 ci (silver w/black)
Last edited by AlfaEmitter; 07-09-2019 at 09:52 AM.
Reason: headlights on comment