Hello NAM,

Finally picked up a MCS after being a lurker for a year. I got myself an '06 MCS with dealer installed Works pkg. Car has 35K miles on it and is in great condition. I'm loving the car.

There is a problem that I've discovered that I'm hoping some one could help me diagnose. So the problem is when on cold startup, I hear this rhythmic squeal/squeak that lasts about 30 seconds. The noise comes from the rear passenger wheel well. Based on some research I've done on NAM it sounds like it may be related to the leak detection pump.

When I took it to the dealer, they diagnosed it as a leaking passenger engine mount. However after replacing it, the noise is still there. Not very happy with them and don't have any faith in them fixing the problem.

I've recorded the noise and uploaded it to you YouTube. Here's the URL: http://www.youtube.com/watch?v=WbsWc9lzQGUAny thoughts/suggestions would be greatly appreciated. TIA.

 

Hope you were able to point out to the dealer that what the repair they did wasn't the cure and able to get it straighten out.

http://www.rockauto.com/catalog/moreinfo.php?pk=2416450

The above part was what came up from Rock Auto...when I typed in "leak detection pump"...aka fuel pressure regulator. It's a $66 part plus shipping, but check around for other places for pricing, assumes this is the problem and maybe there are better ones out there.

Youtube below on a ldp...

http://www.youtube.com/watch?v=95ZbPXQqoA8

Video details the operation and testing of the LDP. The LDP or leak detection pump is a very odd component, but widely used on all Dodge vehicles and some Europeans, such as BMW. This device pumps air into the EVAP system and detects possible peaks using a series of sensors and the ECM itself.

Looking at the video, if the noise does come from the ldp, maybe the up and down motion of certain part(s) is what is causing the squeaking noise?

Keep us posted on your findings if you go back to the dealer or indie shop.

 

Thanks for the info.

Anybody else have any thoughts on what might be causing the noise?

 

I know you mentioned you don't care for the dealer, but why not go back to them and tell them that you suspect it's the LDP and not the motor mounts and that they should at least compensate you for the labor cost if you pay for the part.

I'm guessing they probably need to keep the car overnight or let it cool way down so that the same sound comes back for them to hear it themselves.

At least you know you got good motor mounts now, but wasn't the problem.

 

Ya, I'll be bringing it back to the dealer. Just haven't had the time to bring it and allow them to keep it that long. Was also hoping to collect additional info on what the problem might be so that I'm better prepared this time.

 

Here's the price for a ldp (#02) from realoem.com and looks different from the Rock Auto part and a bit more $$$.

http://www.realoem.com/bmw/showparts...93&hg=16&fg=10

Keep us posted on what you find out from the dealer....for us approaching the high 70's to near 80's mileage mark, I'm incline to think some of us are going to have to replace it sooner or later.

 

Finally! I have had the exact same chirping problem on my 05 MCS.

Video here

Sounds like the LDP is it. If anyone has a DIY solution, let us know!

 

Good to see I'm not the only one with this problem. How long have you had the problem? Have you tried fixing it?

 

I've had the problem since I bought it used in Jan. 2010. No attempt to fix yet. I will have it inspected at the next oil change. It's an annoyance more than anything, so I can let it slide for now...

 

mine does it too. so far no issues though and its been doing it for 15k miles. i will order one and replace it though and ill let you know if tht stops it.

 

Sweet, thanks!! If you can take a few pics!!

G/L with the repair!!

 

Has anyone solved this issue yet? I have the exact same issue.