Annoying Vibration

[bmw325ise]

Hi Guys,

I have a 1992 325i sedan and my problem since i bought the car seems to be the exhaust system. The engine run's sweet as a nut and does not make any funny rattles or anything.

The annoying issue i've got is the fact that when you accelerate you can feel horrible vibrations through the accelerator relating to the revs and exhaust tone.

I have changed my muffler (for a genuine BMW) still the vibrations are there, i have changed my cat for another one, knowing to work. still the vibrations are there, really annoying, arround 1.5k to 2.5k you can feel them the worst.

Can it be my Manifold? or just a bad muffler (bought in august this year) or a bad cat? when the car is at idle you can feel the car shake and sputter but the revs remain solid , im utterly confused, oh yeah replaced the o2 sensor as well...

Please somebody must know what this might be. I used to have a 318 and it was considerably smoother than this car!

[atlantisvip]

Check all the exhaust system hangers.. I had the same issue.. Also, there is a bolt on the drivers side (under the car obviously) that holds something.. Cant remember what it is exactly but it gets loose and vibrates like crazy.. Seems to make the whole floor board resonate.

[4evrwyntr]

If you're sure it's not the engine...

Check the cat. If you've replaced the muffler... just keep going up the system. Sounds like there's a clog SOMEwhere.


EDIT: A thought just occured to me... are the revs that stable? Are you driving an auto or manual?

[bmw325ise]

It's a manual, the revs at idle are fine, the rev counter is solid on about 700 rpm.....

[4evrwyntr]

Okay, nm that then.

[bmw325ise]

BUMP

Guys, need some help here,it's just got worse , real bad vibrations now, could this be drivetraing????????? used: used: used:

[Hamfisted]

Is the vibration only there during accelerations ? Have you looked at the Guibo coupling there at the rear of the tranny? (the flex disc connecting the driveshaft to the tranny....) See if its cracking or broken already. They're about $60. You can find out approximately where the source of the vibration is with a bottle of drinking water placed at different spots along the floorboard of the car while you're driving in the vibration zone. The water will show vibration intensity and you move it fore and aft on the floorboard till its at it's biggest intensity, the cause of the vibration is likely to be along that line somewhere under the car.






Mike

[bmw325ise]

Thanks for the reply Mike.... I have already had the Flex Disc changed, the one was worn. This car is rapidly becomming my worst nitemare.

My local bmw dealer said the problem lied with the catalytic converter, they placed an estimate on my passenger seat totalling about £850.00 to fit and replace the cat.

So I changed the cat myself with a cat from the same year car that had less miles on it, now whether i've got a bad cat or not, i don't know, but how the hell can i tell, the emmissions are perfect!

Shall i just get the cat replaced or shall i buy a cheaper non oem cat??

I just wish the days were longer and shops were open later so i can get this thing checked out by a pro.

[Gkamysz]

I have a vibration that started recently. It's in a very narrow RPM range right now. 1800-1900RPM regardless of load or gear. Now that it's cold here, the vibration can't be felt until after the engine has warmed. This leads me to beilieve it's a mount of some sort. I'm leaning toward engine or transmission mounts. Too damn cold to check things now.

[StokeM3Rep]

i did go absolutly insain with a lil rattle under my car when i reved it was just a bracket

[93 325i]

was the clutch replaced recently? SOunds like a balancing issue with the flywheel

[bmw325ise]

No, the clutch hasn't been replaced.... the car feels really shite now, i actually hate the car at this moment in time!