humming noise on idle, little shaking too?
Thread Starter
Super Member
Joined: Feb 2006
Posts: 674
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From: USA
1999 C43
humming noise on idle, little shaking too?
Helle guys, been a long time. I just started to hear this small humming noise while at red light in gear... When I put the gear in P it goes away, engine wasn't as warm as it shoud be I guess....
I might just be extra **** about this, butI really do not remember this humming noise while stopped in traffic, or red light. Maybe my perception changed too. Maybe it is totally normal.
Anyone experienced a thing like this lately? It just started with cold weather, but again it might just be a coincidence. Should I get the muffler checked maybe?
Any help is sincerely appreciated.
Thank you
Buddy
I might just be extra **** about this, butI really do not remember this humming noise while stopped in traffic, or red light. Maybe my perception changed too. Maybe it is totally normal.
Anyone experienced a thing like this lately? It just started with cold weather, but again it might just be a coincidence. Should I get the muffler checked maybe?
Any help is sincerely appreciated.
Thank you
Buddy
Last edited by Vardar; Dec 2, 2008 at 01:03 PM.
MBWorld Fanatic!
Joined: Apr 2006
Posts: 1,101
Likes: 40
From: Bay Area, CA
98 C43, 15 Alfa 4C LE, 18 Tesla Model 3 DM Perf, 08 Duc S1000, 02 Duc 998, 98 Duc 748, 01 Miata
I get some vibration when I am in drive and sitting still as well. I believe that mine is motor mounts. I'm going to look over mine this weekend and I'm also planning to take it in for some other issues and have them diagnose the vibration as well. If that sounds similar to what you are seeing, that could be your cause.
Thread Starter
Super Member
Joined: Feb 2006
Posts: 674
Likes: 0
From: USA
1999 C43
Thank you for very fast response. Just talked to Staplegun on the ph, he will get back with me as well.
I hope you cen give me updates whenever you can, I will as well.
Thank you
Buddy
I hope you cen give me updates whenever you can, I will as well.
Thank you
Buddy
Thread Starter
Super Member
Joined: Feb 2006
Posts: 674
Likes: 0
From: USA
1999 C43
Loooong years ago, i was able to change the motor mounts on my Audi 4000 or 5000 or whatever 
I hope someone has done it with good directions, or photos. Hopefully it is an easy fix. I have no other problems at all with this C43.. Still loving it everyday
I hope someone has done it with good directions, or photos. Hopefully it is an easy fix. I have no other problems at all with this C43.. Still loving it everyday
I get some vibration when I am in drive and sitting still as well. I believe that mine is motor mounts. I'm going to look over mine this weekend and I'm also planning to take it in for some other issues and have them diagnose the vibration as well. If that sounds similar to what you are seeing, that could be your cause.
MBWorld Fanatic!
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1967 Morris Cooper "S", 1983 911SC, 1997 Toyota Tacoma, 1999 HD FXSTB, 1998 C43
Sounds likely....
From what you are describing it is most likely your engine mounts. I swapped mine out when my starter was giving me problems.
As usual, I purchased ALL my parts from autohausaz.com - ensure you buy the new bolts too, you may slightly strip them in the initial removal so it's nice to have brand new ones for the new mounts.
When you jack up the car and remove the plastic cover, I used a wide 6" by 6" piece of wood on top of the jack. You'll need to support that engine once all the mounts are all loose. Note: You'll be jacking it up on the bottom of the oil sump pan which is reinforced, but if you jack it up without a board to distribute the load you'll go right through it see asterisk location below (that is cast aluminum).
Again not a tough job but get everything first - you'll need the typically MB-used reverse torx type sockets so if you don't have 'em, go get them...
As usual, I purchased ALL my parts from autohausaz.com - ensure you buy the new bolts too, you may slightly strip them in the initial removal so it's nice to have brand new ones for the new mounts.
When you jack up the car and remove the plastic cover, I used a wide 6" by 6" piece of wood on top of the jack. You'll need to support that engine once all the mounts are all loose. Note: You'll be jacking it up on the bottom of the oil sump pan which is reinforced, but if you jack it up without a board to distribute the load you'll go right through it see asterisk location below (that is cast aluminum).
Again not a tough job but get everything first - you'll need the typically MB-used reverse torx type sockets so if you don't have 'em, go get them...
Junior Member
Joined: Oct 2006
Posts: 25
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'09 C350
I've noticed the same thing, mainly when it's colder outside and the drivetrain isn't fully warmed up. Smooths right out if I pop it in N. I figured it was just the cold transmission fluid putting a heavier load on the engine when idling. (that stuff turns to syrup when it's cold...) Once everything warms up it pretty much goes away.
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