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!
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.
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.
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.
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