Rough idle and vibration when accelerating
 

Hey guy, new Audi owner, I've checked the search box, havent found to much information. Audi A4 1.8T is vibrating at idle, I belive I need to change my spark plugs/ignition coils, maybe it will change this, I was told possible motor mounts, but I don't think it's motor mounts because when I put it in neutral it stops, from 0-40mph it seems to be okay, when going up a hill and around 60mph it seems like it's having trouble and its vibrating bad, after I let off on gas its smooths out. I do need an allignment as well but doesn't explain the rough idle, I tightened the serpentine belt tensioner as well, I also notice that the the serpentine belt tensioner and the belt with the pullys is shaking a lot, but not sure if thats causing the rest of the engine to shake or if the engine is shaking the tensioner, and pullys. Thanks guys.

Hi

Had the same problem with my Audi a4, changed ignition coils, problem gone.

Hope it will helps and u will let us know

Thanks

Could be....
 

Hard to say from your description, but I thought I'd share: I had a similar issue with my A6 2.7T. Turns out it was just that the intake pipe was loose and leaking air under boost.

The reason it was rough was because at idle it was not getting the correct air flow to the MAF then again at higher RPMS.

Was a very easy fix I just need to tighten a clamp. -

It's a long shot, but maybe.



Good luck