Vibration - what are the causes?

[rustytop]

Driving around 40 - 45mph in 4th gear the van vibrates slightly, (enough for the rear view mirror vision to become blured). What causes this? I always put it down to the engine being over-revved and coming out of balance at some point in its life. Someone else said it could be worn engine mounts?
Any ideas?

Rustytop

[CovKid]

Tyre balance? You sure its engine?

[billy739]

misfire?

lots of ideas.

i doubt even if you have a diesel nonturbo 40 in 4th is over reving!

[rustytop]

Sorry by over revving I mean that the engine has been over revved before and is now damaged slightly and somehow unbalanced? When I was a lot younger and used to drive my mum and dad's Ford Escort, I used to thrash it within an inch of its life regularly going over 6,000 rpm I suspect, (afterall it was a 1.3 so needed plenty of encouragement..). As a result however, the engine sounded rougher and rougher every time I used it. Vibrations also started to creep in.

Obviously I haven't thrashed the van, but the partner uses it sometimes and is...... well let's just say she is less mechanically sympathetic than me....

Rustytop

[horns]

If it happens at a specific speed, I'd say get the wheels balanced.

[dugcati]

CHECK YOUR TYRES FOR EGGS/DAMAGE ALSO!!

Tyre balance as mentioned can cause this but also tyre damage will do it too

[CovKid]

Wheel bearings, gearbox, CV joints all places you can get rumblings from. Get someone in the back to pinpoint where its coming from.