5ltr Vibration on acceleration

[T-rex]

G'day guys
So I hadn't driven my car for a few days and it was fine before that, and when I started driving today it felt a bit funny but I thought it must have been cause I left it. I don't think thats the case now, from say about 1800rpm to I think 3000ish maybe more it dies off (I didnt really take much notice of when it died off far too angry). It does it worse though heavy acceleration, and also does it in neutral and I cant really hear anything out of the ordinary just vibration. I can feel it through the accelerator and gear stick. Now it could be something with fuel filter/shit fuel cause I went to a different station to normal when I filled up last week (at 3/4s, I don't let it go past 1/4) and I put in 95 I think, defo not standard unleaded (it was a premium though not e85 or something). But harmonic balancer comes to mind cause its way rusty-looking and dosent fit in with the look of the engine (looks older). Its not clutch cause I fanged it up a hill in 5th just to make sure. Sorry about the wall of text, but whats everyone's thoughts?

Thanks
Rex

[VrWagz1]

center bearing housing maybe on tail shaft

[accentstencil]

Could be a worn engine mount.

[T-rex]

Cheers, I got the mounts done bout 8 months ago but I'll check em anyway, I'll try have a look at the tail shaft when I can jack it up, also the vibration pulsates in about 2 second intevals when its doing it, it isn't really a constant. Also it may just be the vibration but the the gear box feels a bit funny while changing gears.

[VS 5.0]

I had a similar issue with mine last year....was usually happening between around 1600 rpm and 2000 rpm and would virtually disappear after that. Would do it weather in park/nuetral or driving along.

I ended up replacing the engine mounts & gear box mount, which were all split, along with the harmonic balancer. It certainly made a difference but from time to time I still get a slight vibration in the same rev range, again whether in park / neutral or driving along.

Given that it happened/happens in park/neutral I wouldn't have thought that it would be a tail shaft issue.

I might also add that it was/is less noticebale under more spirited accelleration as oppossed to normal accelleration if that makes sense...probably because it spends less time in that rev range I suppose.

[T-rex]

Thanks for the help guys, I found the cause, the air con tensioner pulley split in half and somehow caused the whole car to vibrate. Good story behind it, heard a grinding noise so I pulled over and opened the bonnet and it seemed to be coming from the PS pump, since I was a bit from home and on the highway I thought stuff it belts are cheap and I didn't want to wreck the pump cause the rack will need replacement soon anyway I cut the bastard cause I didn't have the stuff to remove it, started it again and the sound was still there, so I trundled round to the front of the car and there was the tensioner, so I cut that belt and went on my way to repco for a PS new belt.

[VS 5.0]

Ahh Ha...I'll have to check mine then.