Vibration at 30mph only when accelerating

[Dan Sherman]

Hi everyone, long time watcher of ETCG but new to forums.
I have come across an odd problem with my 1995 BMW 325i…
The car shakes between 26-30mph ONLY when accelerating.
The harder I am accelerating, the worse the vibration.

For example –
~5500rpm at WOT in 1st it sounds and feels like my car will never move again
~3000rpm at WOT in 2nd it sounds/feels pretty rough, but not as bad as first
~2200rpm at WOT in 3rd it is a fairly minor vibration.

If I stay constant at that speed, there is no vibration until I accelerate again.
It has become pretty troublesome because I accelerate through this point every time I stop at a stop sign or red light.

Thank you guys in advance! Stay dirty >:)

Topic

[college man]

Try rotating your tires to see if the problem gets better or same.
Also check tire pressure. More in this link.

https://www.ericthecarguy.com/faq/determining-the-causes-of-vehicle-vibrations

[Brandon Driskill]

could be inner cv joint (s) are worn and need replaced.

[Mike]

[quote=”bigbird1971″ post=169286]could be inner cv joint (s) are worn and need replaced.[/quote]

As far as I know, these are rear-wheel drive.

I would check wheel balancing and engine/transmission mounts to start with.

[Brandon Driskill]

[quote=”Evil-i” post=169337][quote=”bigbird1971″ post=169286]could be inner cv joint (s) are worn and need replaced.[/quote]

As far as I know, these are rear-wheel drive.

I would check wheel balancing and engine/transmission mounts to start with.[/quote]
definitely check what Evil-I said first, however the 325i has independent rear setup with cv joints.
http://www.pelicanparts.com/catalog/SuperCat/0214/BMW_0214_SUSAXL_pg1.htm#item0

[Dan Sherman]

Thanks guys.
I have rotated the wheels since noticing it and it has had no change – however I do have directional tires so I can technically only half-rotate them.

I have not had the wheels balanced, they are not factory wheels but I have service records saying the wheels were balanced quite a few times in the past 10000 miles or so.

About the CV joints, they seem to look original and horribly corroded into place (can’t wait…) but I have them in my trunk and I will report back if that fixes the problem. Thanks again for your suggestions guys.

[Author]

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