2006 auto MCS. Just last night when I had my window down I noticed that when leaving from a dead stop, I can hear a quick chirp that never again occurs once the car is moving, no matter what the speed. It exclusively occurs when leaving from a stop. Is this a common occurence? Any thoughts?

 

Um, possibly your tires chirping on the pavement?

 

Are you talking about your clutch chirping? Because mine has been doing that too for the past couple of months and I have no idea what is causing it

Edit: I just saw that you said Auto.. sorry about that

 

I have that too, only sometimes. It's like a chirping/friction sound. Hard to explain. And no, it's not from me not knowing how to drive a standard lol. I need to get it looked at :(

 

Yeah, I need to check mine out to. I hope the clutch is not messing up

 

i get that same thing, i think the torque converter locks up quick and makes it chirp easy.

 

Is that a serious issue? or is it just something that happens sometimes?

 

Did you say "automatic"?

Never heard that an auto can have this same problem as manual.

 

Yes, 6-speed automatic. When I have it in manual mode, the tranny seems to downshift to 2nd. I'm going to assume this is normal operating conditions (leaves the line in 2nd in D or Sport mode too, unless I floor it).
It doesn't seem to be the tranny. Regardless if I am in 1st or 2nd gear leaving from a stop, it happens. I think it is suspension related. I'm pretty sure it's not the tires chirping, it's not that kind of chirp.

 

Thread revival. I think it's a motor mount, pitch stop, or possibly tranny mount. The chirp seems to be triggered by the engine shifting weight. Chirp seems to be coming from the front-end of the car or somewhere inside the engine bay. Coming to a stop, the engine naturally leans forward. Upon leaving from the stop, I hear the chirp. Today I have also heard it upon putting the transmission in Reverse from a dead stop. As soon as the gear engaged it chirped but it was a much more brief sound. *sigh*, I guess I gotta go huntin' for messed up bushings, inspect the mounts, etc. I'll try to rock the engine and see if I can replicate it and come back with results.
It is definitely NOT the tires, that much I know and I very much doubt it's a belt.
Just throwin' this out there to see if anyone else encountered this.

 

Could also be an exhaust heat shield, you'll need to look everything over carefully.

Does it sound like a piece of sheet metal rubbing something, or does it sound "heavier" that than?

I think you're on the right track on the motor mount, but it's usually just the right side that fails, if you don't see and telltale streaks from the fluid, it's probably OK.

Let us know what you find, OK?

 

It is a high-pitch sound, almost like a cricket, or imagine briefly scraping glass with a piece of metal.

 

Found the culprit. Loose axle nut, per what was suggested in this thread.
Torqued both (slightly overtorqued in fact), thread locker, hoping for the best. Phew! Dodged a bullet, I thought I would have to replace the half shaft, which is NOT cheap.
https://www.northamericanmotoring.co...tor-shaft.html

 

Thanks for the update!

 

NP, hope it helps someone else too. In fact both sides were loose, the left a LOT looser than the right, which was just beginning to chirp too.

 

Both sides! BMW must have been offering Jaegermeister as beverage during lunch breaks at the Oxford plant! :-)

 

You think?!?