Hello, my Sephia has a failure that appears intermittently, every now and then. When starting to drive at first gears, every time I accelerate, the car vibrates. As I release the accelerator, the vibration stops. And even more, the harder I accelerate, the stronger the vibration is. But as I set higher gears, the car vibrates less every time and, at 5th gear, it is not felt any more. I've already changed bearings, spark plugs wires and spark plugs, but the problem persists. Does anyone know anything about it?
It is easy: check the front bearings, which must be distorted and need to be replaced. This happened to me and, after changing them, it is now working properly.
I suspect problems with rotating parts- discs, shafts, inner and outer cvs, wheels, rims etc. Check them all out and by elimination you will find the culprit.