Good morning, My beloved Volvo is worried…… Days ago I noticed at the front left (direction) a funny clacking/grinding noise. A car master listened to that, first gave a warning about valves etc. Then I sporadically noticed a very slight jerking during the ride. Suddenly in the morning, he jumped after felt hundreds of attempts, even with a lot of blue out of the exhaust. On the way to the “workshop” (garage) I had to refuel. After that he ran only with strong power loss. This cracking was quite penetrating. Anyway, I felt that. Still something to the timing belt, he had some time, but had decided to change it. I was also told by the car master that this noise did not come from there. I also have to mention that the control light engine electric lights. That she did sporadically also, after my feeling was especially fond of humid weather. I would be grateful for how I can start the error search. I don’t have a diagnostic device available. Thank you and greeting.