Hello, with my old Volvo I had to repair the ignition, and at first I did not notice, when setting the ignition time, that there is still a fourth ignition angle marking on the engine block. The 0-degree marking is completely hidden and placed by the others. So I had held the 10 degree marking for the 0 degree marking. Now the car is feeling 1000x better than before, 50km/h in the village can now go for example playing with about 5mm gas old, but the ignition time is now estimated (I have to flash it off again without a vacuum hose) at approx. 7.5 degrees too early compared to the factory specifications. Can I leave this safely if I move the car as before almost exclusively in the lower speed range, or can this damage the engine already there? And how can I determine whether and when the engine starts ringing? Do you feel or hear that?