[Domotron]

Hi All,
i wanted to run this by you guys to see if anyone experienced similar issue i'm having with my car before i start making it rain at BMW dealership... Recently my car started making squeaking noise (As weather started warming up) this noise only happens at low speed 0-20mph then noise goes away. Not sure what it is but here is what I've done so far to try remedy the issue:

1. I have everything related to front breaks replaced - sound still there
2. I replaced the Belt and belt tensioner, all pulleys were right, spun freely with out making any noise. (i even entertained the idea of different non-OE belts) - sound still there
3. Car does not make that noise in reverse

If anyone have any ideas please let me know here is a small clip of the sound on the outside.

[blumagic]

Does it make the noise under idle or only while moving?

OEM Belt and tensioner?

[Domotron]

Originally Posted by blumagic

Does it make the noise under idle or only while moving?

OEM Belt and tensioner?

No noise on free-rev or idle only makes that noise when driving between 0-20mph. Belt and tensioner have been replaced.

[blumagic]

Originally Posted by Domotron

No noise on free-rev or idle only makes that noise when driving between 0-20mph. Belt and tensioner have been replaced.

It is tough from the video to narrow down.

The reason I asked if the replacement parts are oem is because I have had many experiences where non-oem belts and tensioners make noise. More so non-oem belts.

It does kind of have a belt sound from the video. I’d start by turning on the AC at idle to see if the noise happens with that load on the belt.

I’d look for vibrations on all the pulleys, specifically the new tensioner.

loosen the tensioner and check the pulleys for play

Since the problem started when new parts were installed I would doubt it is coincidence so I’d be focused on those parts.

[Domotron]

Originally Posted by blumagic

It is tough from the video to narrow down.

The reason I asked if the replacement parts are oem is because I have had many experiences where non-oem belts and tensioners make noise. More so non-oem belts.

It does kind of have a belt sound from the video. I’d start by turning on the AC at idle to see if the noise happens with that load on the belt.

I’d look for vibrations on all the pulleys, specifically the new tensioner.

loosen the tensioner and check the pulleys for play

Since the problem started when new parts were installed I would doubt it is coincidence so I’d be focused on those parts.

i went ahead and got my original post cleaned i realized it was a bit confusing, everything that i have replaced so far was to try to address the issue and still not having any luck. It does make belt squeaking type of a noise which is the first thing i did was replace the belt and tensioner with bmw OE stuff which made sense since the car sitting at 80k miles. After i did that there was no change to the squeaking sound/noise. So i took everything off and double checked the pulleys and did the AC trick to put more load, still no change to the sound. Eventually i narrowed down the sound to only when the car is in motion at very low speed 0-20mph, at 20mph the sound/noise goes away. Also a weird thing that car does not make that sound in reverse .... knowing BMW there is some weird contraption in the front diff that is making that noise LOL

[blumagic]

I got ya, it was squealing before.

This vid for diagnosing is easier than me typing it out.
https://youtu.be/AEUe6uKxTv8

I’d start thinking either the bearing in the alternator or ac compressor though

[Domotron]

not sure if anyone cares but the issue was one of the oil pan bolts backed out and was hitting the driveshaft. So it was metal on metal contact, once you start accelerating engine mounts flex and metal on metal contact goes away until you slow down to lower speeds. Good thing nothing is coming out of pocket since BMW was last who touched the car when they replaced the motor.

[bryanlopez]

Originally Posted by Domotron

not sure if anyone cares but the issue was one of the oil pan bolts backed out and was hitting the driveshaft. So it was metal on metal contact, once you start accelerating engine mounts flex and metal on metal contact goes away until you slow down to lower speeds. Good thing nothing is coming out of pocket since BMW was last who touched the car when they replaced the motor.

Hey do you still have the Video of the noise? I'm experiencing something similar to what you describe