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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #276  
Old 03-17-2012, 08:46 AM
MAJSabres MAJSabres is offline
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Mein Auto: 1993 325i
No other noises at all other than the sound of the entire car body shaking. I do feel vibration in stick shifter which I did not notice until last night. Can't tell if vibration is mid car or rear. Def not in the front
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  #277  
Old 03-17-2012, 10:50 AM
JayMac JayMac is offline
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Mein Auto: what ever starts
check you drive shaft brace and your flex disc
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  #278  
Old 03-18-2012, 11:58 AM
MAJSabres MAJSabres is offline
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JayMac

Thank you, I will check that today.
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  #279  
Old 03-18-2012, 03:38 PM
MAJSabres MAJSabres is offline
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Thank you JayMac; it looks like its the flex disc. Part ordered, pick up tomorrow, then attacking the job.
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  #280  
Old 03-18-2012, 03:51 PM
JayMac JayMac is offline
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Some recommend doing the brace at the same time since you will have it apart.
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  #281  
Old 03-19-2012, 12:05 AM
GeorgeBush234 GeorgeBush234 is offline
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Hey good luck don't have any missing bolts.
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  #282  
Old 03-20-2012, 07:32 PM
MAJSabres MAJSabres is offline
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Mein Auto: 1993 325i
THANK YOU!!!!!!!!!!!!!!!

Thank you JayMac for your assistance in helping me locate the issue. Flex cap job is complete; went a lot easier than I expected. My car is back running great.

And NO, had no extra bolts GeorgeBush. But I was a little surprised at the weight of that exhaust system.

I did however notice a slight leak off the trans while I was down there. Looks like my next project. Any recommendations on type of trans fluid? as I am a little low.
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  #283  
Old 03-20-2012, 07:35 PM
MAJSabres MAJSabres is offline
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JayMac,

Brace was in excellent condition. Marks on driveshaft also;leads me to believe that job may have been done to the car previously.
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  #284  
Old 03-20-2012, 08:27 PM
JayMac JayMac is offline
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Well you are driving a car that is almost 20 years old and it is a wear item. And for what it is worth you found it. We just throw stuff at the wall and see what sticks. As for oil, I am partial to Amsoil but that is because their distribution center is next to where I work. You can always stop by the dealer for oem goo.
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  #285  
Old 03-21-2012, 05:51 AM
stone128 stone128 is offline
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Hello all,
I have an e46 and just started hearing a buzzing noise only while accelerating from what seems to be the rear. I can only hear it with the windows down and it only occurs while depressing gas. If I coast or just rev engine in neutral the sound does not occur. My initial thoughts are differential, axle, or mounts that when put under torque react with the noise. Any help would be greatly appreciated. I will capture and post some sound later today.
Thanks
Chris
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  #286  
Old 03-21-2012, 06:50 AM
JayMac JayMac is offline
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Not sure if we have the same definitions of buzzing noise but it could be your fuel pump going bad. You can also hear the pump when your fuel gets extremely low.
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  #287  
Old 03-21-2012, 06:53 AM
stone128 stone128 is offline
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If it was the fuel pump wouldn't the noise occur while reving the engine in neutral? This noise only happens when in gear and moving. It's hard to describe the noise but its like a metallic grating sound that is constant while gas pedal is down and immediately goes away when letting off gas pedal.
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  #288  
Old 03-21-2012, 07:04 AM
JayMac JayMac is offline
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The load is what I was responding to. According to your description you say it happens when you load the engine. Your pump puts out more than your car can use, hence the return line. If you idle there is no load. Revving is not much load either. Under load you need more fuel. If the pump is going it will sound like it is straining to provide the car with fuel. I'm not saying it is the fuel pump I am just throwing things out there for you to consider. Does the sound change if you swerve back and forth? If it is the dif, you would think you would here it under coasting also. What happens when you brake hard?
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  #289  
Old 03-21-2012, 07:08 AM
stone128 stone128 is offline
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Ah I see, that could be. I will get a video that hopefully will capture the sound later today and post.
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  #290  
Old 03-21-2012, 07:10 AM
JayMac JayMac is offline
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Stone, gather as much info as you can. Does the noise occur if you accelerate downhill? Uphill? You can pull your rear seat out and drive to help you in locating the noise. Level, constant speed with the cruise on?
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  #291  
Old 03-21-2012, 07:20 AM
stone128 stone128 is offline
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When I hear it the most is when I'm at a complete stop in a parking lot. Then in first gear I give the car gas and begin moving. The more gas I give the louder the noise is and as I let off the gas the noise dissipates. When I shift into second the noise changes frequency but still exists as above. Once I get going any faster I cannot hear the noise anymore. I'm not sure if it goes away or the road noise just washes it out. All of the above is with the driver side window down and my head slightly outside the window listening to the rear of the car.
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  #292  
Old 03-21-2012, 07:37 AM
JayMac JayMac is offline
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Okay, well that's not the same as your first post. So if you hear the noise when the car is not moving chances are it is not in the rear end since nothing is moving. With the car in neutral, clutch in clutch out, any change in the noise?
If you still have the noise with the clutch in you have eliminated most of the rear end since it is now separated from the engine.

You describe that the noise is louder as you give it gas, in the higher gear is the pitch of the noise higher or lower? Faster, slower? Unless you have a different sound with the clutch in or out I still like the fuel pump. Since you say it happens when not moving you should be able to secure the car and get out while it is running. SAFETY FIRST! or get someone to start your car for you while you are outside of it and listen to see if you can hear where it is coming from.

Think it through, take it slow. All we are doing here is what a shop would do but they would get to see the car.

Good luck!
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  #293  
Old 03-21-2012, 07:41 AM
stone128 stone128 is offline
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Ah I'm sorry, my last post gave the wrong context. I do not hear the noise when stopped. I'll rephrase, "I hear the sound most when I start from a standstill and start to accelerate, but I do not hear the noise before giving the car gas in first and starting to move forward."
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  #294  
Old 03-21-2012, 08:03 AM
JayMac JayMac is offline
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Okay, got it. You still have lots of tests to do as stated. So:
No noise when not under load but engine running? Yes/ No
Noise when running at low speed but you depress clutch? Yes/no
Lowest speed you can hear noise at?
Higher gear means higher pitch? yes/ no
Higher gear means higher frequency? Yes no
I still like fuel pump
Could be other items but I would start there. Pop up your rear seat and listen.
Last question and don't be offended, do you know what your fuel pump sound like? If not there are some vids on youtube. Take a listen to get a reference point.

Last test to try is under acceleration drag your brakes and see if noise changes.
Report back and we will have another whack at this.
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  #295  
Old 03-21-2012, 08:05 AM
stone128 stone128 is offline
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Great, I will report back later tonight after doing more analysis. Thanks for all your help!
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  #296  
Old 03-21-2012, 08:09 AM
JayMac JayMac is offline
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Don't forget the swerve test side to side. I would have a list of all the things you want to do so you don't forget. Don't forget to turn off the radio! lol
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  #297  
Old 03-21-2012, 12:34 PM
stone128 stone128 is offline
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I haven't gotten around to performing all tests but I think I have a simple answer. I just spent some time in a parking lot and I think it is just my snow tires making the noise under load. This is the first week its been warm enough to put down the windows and all of a sudden I have this noise, but I think the noise existed all while I had the snow tires on I just didn't hear it till now. I'm going to put on my summer tires tonight and verify. BTW the snow tires are Nokian Hakkapelita R's and have "teeth" that could definitley be making this noise.
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  #298  
Old 03-21-2012, 12:52 PM
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veteran011 veteran011 is offline
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by "teeth" do you mean "metal studs"?
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  #299  
Old 03-21-2012, 01:27 PM
stone128 stone128 is offline
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No they are not studded
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  #300  
Old 03-21-2012, 09:14 PM
JayMac JayMac is offline
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Occam's razor.

That is good news!
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