Front end rhythmic clunk, need help diagnosing - Mazda3 Forums : The #1 Mazda 3 Forum
 
LinkBack Thread Tools
post #1 of 2 (permalink) Old 10-24-2019, 10:29 AM Thread Starter
Moped Rider
 
Join Date: Jun 2008
Posts: 15
Front end rhythmic clunk, need help diagnosing

Hey all,
2008 Mazda 3 S GT Hatchback, Manual tranny.

The other day I noticed a clunk clunk clunk noise coming from what seems to be the front end, possibly drivers side but can't exactly tell.
Drove it to work and on the way home, it became considerably louder.
It is a pretty loud clunk clunk clunk, as opposed to a tick or higher pitched noise.
It is NOT a grinding or whurring noise.

Here's how it reacts:

Noise is NOT present under acceleration (on the gas).
Noise comes immediately back very present when letting off the gas. Any speed. Popping out of gear and putting in neutral the noise still remains the same.
The noise (clunk clunk clunk clunk) appears to get faster and slower with speed.
If I hit the brakes, the noise stops.
If I turn left or right, at any speed, the noise mostly stops.

Drivers CV joint was replaced by dealer this May (due to torn boot and age). I'm assuming that's not the issue, unless something went wrong there, but it's been fine all summer.

Put the car up on jacks, I tried to grab and move anything I could, but nothing really seems loose..
Endlinks are NEW and tight.

What I did notice, is the bigger bushing for the Control arm (rear bushing near the steering rack) is pretty dry rotted and alot of the rubber is chipped out, and it has quite a bit of play in it..
I'm thinking this would be the cause of my steering vibration over the past year or so, but could this actually cause the noise I'm getting?

Would something in the steering rack cause this?
Other thing I noticed, Car on the ground, steering wheel unlocked but car not running, if you move the steering wheel left and right, there's a single knock when moving to the right.. so if you kept moving the steering wheel to the right, it's would be knock, knock, knock.
I could of swore it's always done that from when I remember in the past and I thought that was normal, but maybe it's not?
latham83 is offline  
Sponsored Links
Advertisement
 
post #2 of 2 (permalink) Old 10-28-2019, 08:51 PM
Moped Rider
 
Join Date: Apr 2019
Location: San Diego, CA
Posts: 34
I'm leaning toward the CV joint.

IMO, if the noise is speed-dependent (not temperature, idle, RPM dependent) then it can only be rotational= tire, rim, brake rotor, CV joint

What makes me think it's the CV joint is that the noise goes away at both accel and decel, so when there is torsional force on the axle, the bearings inside the joint are pressed and there is no freeplay. But once you start cruising or put it in neutral, the internals can clunk. I assume it only makes the noise when the car is moving.. so possibly the passenger side is the culprit (esp if only the driver's side was replaced due to age)
Birchtree is offline  
Sponsored Links
Advertisement
 
Reply

  Mazda3 Forums : The #1 Mazda 3 Forum > Technical / Model / Performance > Suspension / Brakes

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mazda3 Forums : The #1 Mazda 3 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not 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

 
For the best viewing experience please update your browser to Google Chrome
8