97 540 vibration in floor, Help!

[uconn299]

My 97 540 has 73,000 miles on it. The car is vibrating in the floor near the pedals and also can feel it in the drivers seat at speeds around 75mph and higher. Strange thing is when I accelerate it sometimes goes away.

Also, if I have the car in park and push the gas in, once engine reaches 1,000 rpm I get the vibration in the floor near pedals and seat. The vibration starts soft and gets more violent as I get closer to 3,000 rpm's.

I am thinking this might be an exhaust problem since I can feel the vibration when it is stopped. Any ideas on what it might be and what fix could be done?

Front tires are new, also had alignment done around 60,000 miles.

[superdeadman]

it defintiely can be exhaust- check to make sure the exhaust has no play under the car. It can defintely vibrate violently.
That, however, doesn't go along with the fact that it goes away when you step on it...

so i dunno

[LOS]

Also check your Catalyc converters. If you hear rattle is time to replace them. This can cause what you're describing. How is your MPG?

LOS

[Teh Prof]

Tranny issues?

[LOS]

Originally Posted by M3UOND

Tranny issues?

I think not!
He says when in "park" and revs up the engine, he feels the vibration...

uconn299, do you get the vibration on the steering wheel as well?

LOS

[Teh Prof]

Originally Posted by LOS

I think not!
He says when in "park" and revs up the engine, he feels the vibration...

uconn299, do you get the vibration on the steering wheel as well?

LOS

He may have an automatic. Stuff still spins in an automatic tranny when it's in park.

[uconn299]

It is automatic. There seems to be some vibration in the wheel but not as much as the floor and pedal area.

If it is in park and I rev it to 1,000 rpm, the vibration will start and stop, start and stop, repeating.

Havn't checked under car yet for loose parts.

[LOS]

I also have a 97 540ia with 80k miles.

I though it could your drive shaft but since the car is not moving, that's out of the question. By the way, is not the tranny either. So, check for loose parts underneath and tap on the cat's and we'll go from there. I'll read my repair manual tonight and look for those symptoms. I'll let you know tomorrow.

Do you know what a misfire feels like? The reason why I ask is because I had a similar problem on a camaro. I could feel a misfire and replace the plugs along with the cables. Afterwards it was fine. Check your plugs & coil connections. it's very simple to do. Check the repair manual for an e34 on this forum. Your car has the M62 engine (4.4L). The one on the 95 540ia is the M60 (4.0L). So use it as reference when removing the cover, the plugs a nd coils. It's the almost the same engine.

LOS

[Teh Prof]

If a 2001 528 with racing dynamics software is misfiring in cylinder 5, are the plugs and wires likely culprits?

[LOS]

Maybe but also could be the fuel injector on that cylinder. You should be getting an error code in most cases though.

LOS

[Teh Prof]

Originally Posted by LOS

Maybe but also could be the fuel injector on that cylinder. You should be getting an error code in most cases though.

LOS

Thank you.

There is an error code, but apparently it just reports a misfire in cylinder five.

The problem usually happens after hard acceleration from 2nd gear, and usually corrects itself after turning the car off and on.

[LOS]

Don't quote me on this but if I had to bet any money, I'll say is a faulty fuel injector... Try putting premium gas and some redline fuel additive for now and hope for a dirty injector.

By the way, you didn't say anything about the mileage. My assumtion is under 100k.

LOS

[Teh Prof]

Originally Posted by LOS

By the way, you didn't say anything about the mileage. My assumtion is under 100k.

LOS

Correct. 67K.

[V_RocKs]

I had a similar issue with a fuel injector. Look around for a diagnostics terminal and check it out yourself. I did and saved a ton of money.