As a freshly baked vintage car owner (Ford Y 6CV, Built 1934, 21 HP, in France built UK model, so 6Volt with PLUS on the body!) I was a few weeks really happy. Until 3 weeks ago the engine runs at once only on 2 or 3 cylinders. By pulling off the ignition cables cylinders 3 and 4 could be found as an evildoer. At downhill, partly one of the two, sometimes even both cylinders came back for a short time. The appearance of the problem was afterward too The problem was that the ignition lock had twisted and the voltage was not really switched on properly – problem is fixed. I don’t know if the one with the other can have something to do. Since then the engine also drips quite a lot of oil, which was not so before. Well, so we have all spark plugs renewed, new ignition cables installed, new V divider cap, distributor fingers changed, compression tested (all 4 cylinders at the same level). But, unfortunately without little success. So, carburetor (Solex 26 AC) opened: float leaks! After a long search a new (!) found, built in. Well, now 3 of 4 cylinders run. Then ignition coil is renewed, and a new carburetor from UK is worried (also new! “Zenith” or replica of it). Replaced – no significant change! So I and the nearby oldtimer workshop What’s more interesting: If you pull off the ignition cables now, then cylinder 1 is the culprit. Dubios is that if you push the spark plug only slightly (only touch the plug with the porcelain body, depending on the position) without contact with the candle contact, the cylinder seems to ignite (speed increases slightly). If you plug the plug completely onto the candle, the effect is gone again. This effect is reproducible. . Can it be a contact problem, mass problem (plus), creep current etc.? Otherwise ideas what else we could/should try? I am very grateful to you about helpful tips! Knut