Shaking and vibes at 1500 RPM - Page 4 - Mazda3 Forums : The #1 Mazda 3 Forum
LinkBack Thread Tools
post #31 of 35 (permalink) Old 02-03-2019, 12:37 AM
Grand Am Series
rickkari's Avatar
Join Date: Feb 2018
Location: Spring Hill, TN
Posts: 297
Originally Posted by misfitbum View Post
My car does idle really good, but the vibration/shaking/shudder remains when I reach cruising speed on city streets (40-45 MPH). Not sure how to describe it any better. It's mainly occurring when my foot is keeping a steady and light pressure on the gas pedal. RPMS will be fine and constant, then they drop a bit and the car starts vibrating/shaking and kind of feels like its bogging down. If I let off the gas or goose the gas pedal, it goes away.
Sounds like you are describing a bad torque converter lock up shudder issue symptom that is due to a bad torque converter. Just diagnosed one on a 2012 Camry the other day. You described the exact symptoms that it had. I have no experience diagnosing Mazda lock up issues, but it sounds like it by your description.

Jesus Saves
rickkari is offline  
Sponsored Links
post #32 of 35 (permalink) Old 02-03-2019, 10:09 AM
Short Track Racer
Join Date: Jun 2015
Posts: 240
Originally Posted by misfitbum View Post
.... I'm thinking now that my best bet is to take it in somewhere and get the coils/plugs and injectors professionally tested. Maybe there's a way I get the fuel pump and fuel filter tested too?

Let me know if there is anything else to try! I just want my car to drive normal again!
IMO you should have been using an OBD realtime data stream reader quite a while ago in this process. There have been lean codes set, and getting some key values (such as fuel trims) might be really helpful in diagnosing what the issue is. In addition to realtime data stream, the freeze frame data, captured at the time the code is set, can be very helpful as well. One fairly inexpensive and very popular realtime OBD tool is Torque for Android, although there are other choices as well, including off-the-shelf units.

And one other thing you can try is to add a bottle of Techron complete fuel system cleaner to your next tank of gas. Not saying this will fix your vehicle's issue, only that it's never a bad thing to do (i.e. routine maintenance), and MIGHT result in some improvement.

And my final item is the link below on a known MAF wiring issue with Mazda 3. However, the symptom in this link is rich running, which is opposite of what yours has been getting. But even though it doesn't sound like a hit, I'd want to check it out, simply because it's a known problem that's in the same ballpark.

2011 3i 2.0 A/T 145K miles
m3iguy is offline  
post #33 of 35 (permalink) Old 02-15-2019, 10:20 AM Thread Starter
Go-Kart Driver
Join Date: Jan 2009
Posts: 93
Whatever improvement I had from replacing the throttle body and O2 sensors is gone now. My car is back to driving really horrible. Jumpy idle, vibrations at specific RPMs, jerky acceleration.

Seems like the car drives somewhat better after resetting the computer, but once everything is re-learned it goes back to the way it was driving before.

Not sure what else to try. So I think I will be taking it in to the Mazda Dealership and go from there.
misfitbum is offline  
Sponsored Links
post #34 of 35 (permalink) Old 03-04-2019, 10:54 AM Thread Starter
Go-Kart Driver
Join Date: Jan 2009
Posts: 93
I finally got this issue fixed. The local mazda dealership found out that the bracket that goes between the rear motor mount and the transmission was completely trashed. They put a new one on and my car drives like it's brand new now. Glad I got it figured out.

Attached is a picture of the part they replaced. Hope this helps anyone that has the same problem!
Attached Images
File Type: jpg mountbracket.JPG (32.6 KB, 18 views)
rickkari likes this.
misfitbum is offline  
post #35 of 35 (permalink) Old 03-05-2019, 06:27 PM
Grand Am Series
VWandDodge's Avatar
Join Date: Mar 2011
Location: Oklahoma
Posts: 449
Glad you posted a resolution. Broken brackets will do it every time.

2006 Mazda 3 2.3L Hatchback 5-speed Automatic - 180K miles
I never purchase Harbor Freight tools.
VWandDodge is offline  
Sponsored Links

  Mazda3 Forums : The #1 Mazda 3 Forum > Technical / Model / Performance > Powertrain 2004-2009 Mazda3

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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

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

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