Seat alhambra 1.9 tdi 90hp strange vibration


New member
Nov 19, 2020
Seat Alhambra 1.9 tdi 90hp, Volkswagen Sharan 1.9tdi 115hp
So i have this problem with my car, which i find quite strange. First of all i had a problem with reverse, it go hard to reverse and sometimes i think i got in reverse but it just grinds and i have to try again till i get in reverse, and so i was recently replacing my axles and noticed one engine bolt to the transmission was not put in, so i found a bolt that was the right diameter, i put the bolt in and bolted it down. Now i can get in reverse always easily, but i get a huge vibration at 3k rpm and smaller vibration at 2000-3000 rpm, and in 4000rpm its unbearable. But once i remove the bolt, the vibration goes away, engine works smoothly and reverse sometimes can be hard to find. Any suggestion on what to do ?