Rattling noise "only over 60 mph" - Smart Car Forums
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 32 (permalink) Old 06-24-2009, 01:49 PM Thread Starter
OTD2 lifetime Member
SCOA Club
 
Monalis's Avatar
 
Join Date: May 2009
Location: Montgomery AL
Posts: 286
Thanks: 39
Thanked 77 Times in 41 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Garage
Rattling noise "only over 60 mph"

The other day Betty started making a racket, sounds like the radio console is loose or something is in the glove box rubbing against the plastic. (hope you know what I'm talking about)


Over the last couple of days I've tried to figure out what is causeing the noise and have yet to figure it out. So here are my observations in hopes someone has had the same problem, or something similar and can help me figure it out.
  • The noise starts exactly when I hit 60 mph and stops as soon as I dip below 60.
  • There seems to be nothing loose, at least pushing the differant "panels" doesn't cause the noise to stop.
  • Taking everything out of the glove box does not help
  • Turning off the AC doesn't help
  • Took all the CDs out of the player, didn't help.
  • It seems that at night the noise isn't there, but I'll have to pay closer attention tonight.
Betty is just over a month old, and has about 3,000 miles on her. It's been really hot durning the day, upper 90's to low 100's and a bit cooler at night, in the 80's.

So I wonder what part of my car could be making this noise only when it is really hot out and only when going above 60mph.

Please help, it is driving hubby crazy (when I let him drive)
Monalis is offline  
Sponsored Links
Advertisement
 
post #2 of 32 (permalink) Old 06-24-2009, 02:11 PM
 
John_H's Avatar
 
Join Date: Apr 2008
Location: Roanoke, VA
Posts: 3,558
Thanks: 0
Thanked 37 Times in 17 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
It's possible one of the balance weights on a wheel came off and what you hear is the resonance coming from part of the screwed-together assembly.

Since it's only a month old, if the weight came off there should still be evidence it ws there. Take a look at your tires to see if there's anything that looks like the footprint of a missing weight. You should have weights on the wheels - almost never is a wheel balanced with no adjustment.

It's a bit extreme to need your wheels balanced when it's only a month old, but perhaps your Smart Center would take care of that for you (if you ask nicely) if you're up that direction anyway. Maybe you need an excuse to purchase Smart branded goodies!
John_H is offline  
post #3 of 32 (permalink) Old 06-24-2009, 02:45 PM
JOIN SCOA YOU'LL BE GLAD
SCOA Club
 
jetfuel's Avatar
 
Join Date: Sep 2008
Location: padded room #1
Posts: 8,450
Thanks: 744
Thanked 1,881 Times in 918 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 67 Post(s)
...so..what happens after 60...louder?
...does your car bounces up/down at 60?
...does your car shimmy left/right at 60?
...is your "hood" properly engaged in the upper tracks of the body?
...what's for dinner?

jetfuel
jetfuel is offline  
post #4 of 32 (permalink) Old 06-24-2009, 04:09 PM
 
Join Date: Dec 2008
Location: Martinez
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My cabrio also "developed" a rattle. Turned out it was the passenger seat belt banging against the plastic. I just grab it and pull it out to place the metal portion on the seat and the rattle goes away.
slk230 is offline  
post #5 of 32 (permalink) Old 06-24-2009, 04:11 PM Thread Starter
OTD2 lifetime Member
SCOA Club
 
Monalis's Avatar
 
Join Date: May 2009
Location: Montgomery AL
Posts: 286
Thanks: 39
Thanked 77 Times in 41 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Garage
Quote:
Originally Posted by jetfuel View Post
...so..what happens after 60...louder?
...does your car bounces up/down at 60?
...does your car shimmy left/right at 60?
...is your "hood" properly engaged in the upper tracks of the body?
...what's for dinner?

jetfuel
It stays the same up to about 75, haven't gone over that yet, as soon as I go below 60 it stops, just to start again as I hit 60.

Car doesn't have any additional movement, no bounces or pulling to the left or right, that I can tell. I'll pay closer attention on my way home to check alignment on the road.

Hood is properly engaged and latched

And I think it's apple & sage grilled pork chops, around 9pm central.
Monalis is offline  
post #6 of 32 (permalink) Old 06-24-2009, 04:19 PM
JOIN SCOA YOU'LL BE GLAD
SCOA Club
 
jetfuel's Avatar
 
Join Date: Sep 2008
Location: padded room #1
Posts: 8,450
Thanks: 744
Thanked 1,881 Times in 918 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 67 Post(s)
...open the door and check the "flaps"(3ea) that secures the front fender to the inner body... see if they are loose....don't just trust your eyes...see if they can be moved with hand pressure...
....pasta primavera on this end...

jetfuel
jetfuel is offline  
post #7 of 32 (permalink) Old 06-24-2009, 04:34 PM Thread Starter
OTD2 lifetime Member
SCOA Club
 
Monalis's Avatar
 
Join Date: May 2009
Location: Montgomery AL
Posts: 286
Thanks: 39
Thanked 77 Times in 41 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Garage
Quote:
Originally Posted by John_H View Post
It's possible one of the balance weights on a wheel came off and what you hear is the resonance coming from part of the screwed-together assembly.
I never even thought about the weights. But since it doesn't drift, that I'm aware of, I don't think its that. But I'll keep it in mind and check for drift on my way home tonight.

Quote:
Originally Posted by slk230 View Post
My cabrio also "developed" a rattle. Turned out it was the passenger seat belt banging against the plastic. I just grab it and pull it out to place the metal portion on the seat and the rattle goes away.
I wish it was that easy, but since both hubby and myself were in the car this weekend and still heard it. I don't think its the seat belt. But I will keep that in mind since I usually do drive alone.

Quote:
Originally Posted by jetfuel View Post
...open the door and check the "flaps"(3ea) that secures the front fender to the inner body... see if they are loose....don't just trust your eyes...see if they can be moved with hand pressure...
....pasta primavera on this end...

jetfuel
I'll check those in a bit, when things slow down over here. I hope it's something simple.
.... mmmmm pasta
Monalis is offline  
post #8 of 32 (permalink) Old 06-24-2009, 04:43 PM
JOIN SCOA YOU'LL BE GLAD
SCOA Club
 
jetfuel's Avatar
 
Join Date: Sep 2008
Location: padded room #1
Posts: 8,450
Thanks: 744
Thanked 1,881 Times in 918 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 67 Post(s)
..one more ...open the hood...make hubby check the fan housing...big black round coffe can looking thing on the passanger side of the car...again..see if it will move when hand pressure is applied...high speed/frequency vibration noises will drive anybody up a wall....

jetfuel
jetfuel is offline  
post #9 of 32 (permalink) Old 06-24-2009, 04:45 PM
 
NeWave's Avatar
 
Join Date: Jun 2008
Location: St. Louis, MO
Posts: 1,069
Thanks: 4
Thanked 26 Times in 15 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've got a similar issue, but I'd call it more of a tapping for me. Anything above 45 and it starts tapping right near the drivers door.. somethings loose. Just don't know what... Good luck on figuring that out.
Grilled Cod with seasoned rice...
NeWave is offline  
post #10 of 32 (permalink) Old 06-24-2009, 04:54 PM
 
John_H's Avatar
 
Join Date: Apr 2008
Location: Roanoke, VA
Posts: 3,558
Thanks: 0
Thanked 37 Times in 17 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Quote:
Originally Posted by Monalis View Post
I never even thought about the weights. But since it doesn't drift, that I'm aware of, I don't think its that. But I'll keep it in mind and check for drift on my way home tonight.
A wheel balance problem typically results in vibration, not drifting. Alignment problems - a separate issue - are what cause the car to drift.

To make sure it has to do with tire speed rather than engine RPM between 60 and 75, try changing gears to 4th gear (which is still below redline at the electronically limited 92mph). You can even check 3rd gear at 60mph though I didn't like holding my car at 65mph in 3rd gear up those hot California mountains coming over from Oregon; it'll do it, though. Your engine will automatically upshift if it's at redline so you can't blow your engine by kicking it into 3rd. I just don't like the noise.
John_H is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Smart Car Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


331

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



  Similar Threads
Thread Thread Starter Forum Replies Last Post
Rattling noise under car eqwalker smart fortwo (451 - US vehicle) 23 09-17-2014 10:38 AM
Air Conditioner: Loud "thunk" noise? bradgarbus smart Operation and Maintenance 18 06-21-2010 11:41 AM
I have a rattling noise from the back yuckmoon smart General Discussion 17 01-04-2009 04:19 AM
Advertising? There was a check box for "wraps" and "stickers" randombilly New Members Area 3 08-31-2008 03:49 AM
Need additional "SCOA" placards "skyzdlimit59" 2442 California Chapter 1 03-30-2008 10:37 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On