Mazda3/Mazdaspeed3 Engine/Drivetrain Modification Discussions for the Mazda3 and MazdaSpeed3

rough idle

Old February-26th-2011, 03:17 PM
  #1  
Registered User
Thread Starter
 
Join Date: Feb 2011
Posts: 2
elvisfrodo is an unknown quantity at this point
rough idle

I am a first time poster here. I have on 06 mazda 3 2.3l with auto. The engine has a rough idle. Is has no check engine codes reading. My gas mileage and performance have not degraded at all. I changed plugs (they were pretty clean). I looked at the throttle body intake, it is clean. The car runs like a top except for the rough idle. Any suggestions?
elvisfrodo is offline  
Old March-1st-2011, 11:23 AM
  #2  
Registered User
 
Join Date: Mar 2007
Location: Newark,ny
Posts: 910
djs2571 is on a distinguished road
Has it been rough forever, or just started? I'll assume its been there all along and you have to sort of live with it.
Mine vibrated at idle, and has done it since day one... it improved a tiny bit after stiffening the engine mounts. I added silicone to keep the engine from moving as much since the manual i've got has a lot of movement when starting off.

If it's a new issue or very rough, it could be an engine sensor, bad gas, dirty fuel injectors or something like that. Fuel system cleaner is the easiest thing to try - it's really just mineral spirits mixed into the fuel as a solvent - look it up online for concentration information.
djs2571 is offline  
Old March-1st-2011, 08:32 PM
  #3  
Registered User
Thread Starter
 
Join Date: Feb 2011
Posts: 2
elvisfrodo is an unknown quantity at this point
nope, it was very smooth up till about 5000 miles ago. I used fuel injector cleaner, did nothing. If I put the car into neutral it smooths out completely. There in no other driveabily issues at all, it revs smooth all the way to 6500 RPM, and never hesitates. I use good gas the vast majority of the time.
elvisfrodo is offline  
Old March-2nd-2011, 05:12 AM
  #4  
Registered User
 
Join Date: Mar 2007
Location: Newark,ny
Posts: 910
djs2571 is on a distinguished road
Is it just the idle dropping when in gear or is the roughness more than just low idle? Did you do any work around 5k miles ago? If there's an air leak in the intake that could cause rough idle according to the manual.

This note is to correct idle drop when the A/C is cycling - could be related to the issue you're having if it hasn't been updated yet. See http://www.finishlineperformance.com...39-07-1842.pdf

You may have to wait and see if it gets worse and therefore turn on the check engine light. Or have it looked at by a shop, the dealer may have some information on a common cause of this kind of issue.
djs2571 is offline  
Old March-4th-2011, 01:48 PM
  #5  
Registered User
 
Join Date: Mar 2011
Posts: 1
dscukanec is an unknown quantity at this point
rough idle solution

I had rough idle on my 2005 2.0l 3. Found a service bulletin online describing symptoms as rough idle or even engine stall after stopping.

Basic solution is to remove the throttle body and fully clean it. the engine side of the throttle was covered with very hard carbon deposits. This interferes with the idle air flow when the tottle is closed.

After cleaning with cleaning spray it looked like I bought a new replacement throttle body. bolted it back on and car ran like new.

In my case the rough idle started slowly and got worse as I put more miles on the car until it died on me today. No CEL either.

Hope this helps
dscukanec is offline  
Old March-5th-2011, 06:44 AM
  #6  
Registered User
 
Join Date: Mar 2007
Location: Newark,ny
Posts: 910
djs2571 is on a distinguished road
Excelent, thanks for the info... i've cleaned my throttle body a few times when doing other maintenance so it never got plugged - good to know there is an easy fix for this.
djs2571 is offline  
Old March-18th-2019, 08:51 PM
  #7  
Registered User
 
Join Date: Mar 2019
Posts: 1
Bjmack22 is an unknown quantity at this point
Did u change or disconnect the battery try the throttle body relearn

Leave the car run in park for 20 mins dont touch anything after 20 mins turn ac on full blast for 20 mins this simple trick fixes the problem 90% of the time
Bjmack22 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
givntofly25
Mazda3/Mazdaspeed3
1
September-26th-2010 08:34 PM
mobomelter
Mazda3/Mazdaspeed3
4
September-19th-2006 03:00 PM
zmanpro63
3rd gen Engine/Drivetrain
13
March-22nd-2005 01:35 AM
bazooka joe
3rd gen Engine/Drivetrain
4
July-22nd-2003 09:44 PM
mtbfreak40
3rd gen Engine/Drivetrain
9
August-14th-2002 11:00 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: rough idle


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.