Many thanks for your advice, when i returned to canadian tire they took at list 30 minutes to say , we have find nothing wrong on your engine , every thing is fine , but it could have a relation ship with your battery charger , because i have put a charger because during the winter , i'm frequently working from home, so i worry for my battery, so they said it's related to this device, but every one knows , that there is nothing in between , this device wa here since the last year and every thing was fine , i wonder why only when i passed to canadian tire garage it becomes like that. the performances of my car on the road still the same. "to be continued".................