Cylinder Deactivation Recall - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
User Tag List

 2Likes
Reply
 
LinkBack Thread Tools
post #1 of 22 (permalink) Old 06-29-2019, 02:18 AM Thread Starter
Registered User
 
Join Date: Jun 2014
Posts: 136
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 57 Post(s)
Thanks: 0
Thanked 19 Times in 16 Posts
Groans: 0
Groaned at 0 Times in 0 Posts
iTrader: 0 reviews
Cylinder Deactivation Recall

Wish they would just have a option to disable cylinder deactivation as I see zero MPG gains from the previous engine. Maybe they can fix the jerky low speed issue too.

Jun 27,2019
Manufacturer Recall Number 3719F
NHTSA Recall Number 19V-497
Recall Status Recall Incomplete, remedy not yet available

Summary

On certain subject vehicles, the powertrain control module (PCM) software controlling the hydraulic valve clearance adjuster may operate improperly when transitioning from cylinder deactivation to full cylinder activation modes while driving, due to inappropriate control logic of the PCM. As a result, an intake valve rocker arm may come out of position and make contact with internal engine parts, which may cause an engine misfire and loss of power and/or Malfunction Indicator Light (MIL) illumination.

Safety Risk

In the worst case, engine damage may occur, resulting in engine stall while driving without ability to be restarted, which may increase the risk of a crash.

Remedy

A Mazda dealer will reprogram the PCM with improved hydraulic valve adjustment control software, so that it may operate properly when transitioning from cylinder deactivation to full cylinder activation modes while driving.
guy989 is offline  
Sponsored Links
Advertisement
 
post #2 of 22 (permalink) Old 06-29-2019, 08:42 AM
Registered User
 
tickerguy's Avatar
 
Join Date: Nov 2013
Posts: 2,539
Mentioned: 99 Post(s)
Tagged: 0 Thread(s)
Quoted: 919 Post(s)
Thanks: 19
Thanked 527 Times in 403 Posts
Groans: 4
Groaned at 7 Times in 7 Posts
iTrader: 0 reviews
Ouch.

"Make contact"? Uh..... that would be called catastrophic engine damage.

One of the worst possible outcomes for a situation like this is valve/piston contact. That can and does, in many engines, lead to a valve dropping thousands of miles later on.

I hate to put this out there, as I love Mazda, but if I owned one of these vehicles I'd sell it NOW unless they are going to extend unlimited mileage warranty coverage against top-end failures including all consequential damage. IF you drop a valve like this it is highly likely to wipe out the engine entirely, and no, 60,000 miles is nowhere near enough coverage especially if you're halfway through the warranty period already -- which is likely for some of these vehicles.

Damn.
tickerguy is online now  
post #3 of 22 (permalink) Old 06-29-2019, 10:34 AM
Registered User
 
Cdn17Sport6MT's Avatar
 
Join Date: Apr 2017
Location: Vancouver, BC Canada
Posts: 469
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 148 Post(s)
Thanks: 2
Thanked 23 Times in 23 Posts
Groans: 2
Groaned at 0 Times in 0 Posts
Garage
iTrader: 0 reviews
I have not heard of a cylinder de-activation system out there, amongst all of the mfrs, that works trouble-free. I don't like them at all. Conceptually I don't like them. However good Mazda engineers are, when they came up with a de-activation system for a 4 cyl engine (the first such system) it REALLY gave me pause. I am not surprised. I hope for Mazda's sake this is not a mega-issue for them... (and for the owners, too, of course).

Cdn17Sport6MT
Vancouver, BC Canada
Cdn17Sport6MT is offline  
Sponsored Links
Advertisement
 
post #4 of 22 (permalink) Old 06-29-2019, 12:42 PM
GWL
Registered User
 
Join Date: Mar 2015
Posts: 255
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 85 Post(s)
Thanks: 8
Thanked 12 Times in 10 Posts
Groans: 1
Groaned at 1 Time in 1 Post
iTrader: 0 reviews
Cylinder deactivation didn't improve gas mileage significantly, what was it 1mpg improvement on the highway?


What a waste of effort.
GWL is offline  
post #5 of 22 (permalink) Old 06-29-2019, 03:05 PM
Registered User
 
tickerguy's Avatar
 
Join Date: Nov 2013
Posts: 2,539
Mentioned: 99 Post(s)
Tagged: 0 Thread(s)
Quoted: 919 Post(s)
Thanks: 19
Thanked 527 Times in 403 Posts
Groans: 4
Groaned at 7 Times in 7 Posts
iTrader: 0 reviews
It's not done for the window sticker number, it's done to satisfy the jackwads at the EPA and in Washington DC generally who keep insisting on more and more miles driven per gallon of fuel consumed.

You eventually run out of straight-line engineering ways to do that and have to resort to either tricks or deleting models since the "bin" is across your offerings; if you want to sell larger cars, which are of course heavier and have more frontal area (thus get lower fuel economy) you are forced into trickery of various sorts.

My view of the correct answer to this dilemma requires only about 3.5% of the American population to take the same decision, but it appears that what motivated people in 1776 here is long since dead, buried and forever gone.
tickerguy is online now  
post #6 of 22 (permalink) Old 06-29-2019, 11:28 PM
Rally Racer
 
DrFeelGood's Avatar
 
Join Date: Aug 2013
Location: Portland, OR
Posts: 1,546
Mentioned: 171 Post(s)
Tagged: 3 Thread(s)
Quoted: 442 Post(s)
Thanks: 123
Thanked 169 Times in 158 Posts
Groans: 1
Groaned at 0 Times in 0 Posts
Garage
iTrader: 0 reviews
First thing I did with my Honda VCM was to disable it. I will still cycle it periodically to keep the solenoids mobile but otherwise the hesitation and harmonics are quite annoying.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mozz-D
2004 6s Wagon 3.0, 5-speed ATX
DrFeelGood is offline  
post #7 of 22 (permalink) Old 06-30-2019, 12:51 AM
Registered User
 
oblivioncth's Avatar
 
Join Date: Dec 2018
Posts: 62
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Thanks: 9
Thanked 4 Times in 1 Post
Groans: 0
Groaned at 0 Times in 0 Posts
Garage
iTrader: 0 reviews
Man I can't find more info about this anywhere, those numbers return nothing on Google. To be fair though, it is only days old...
oblivioncth is offline  
post #8 of 22 (permalink) Old 06-30-2019, 02:30 AM
Registered User
 
Cdn17Sport6MT's Avatar
 
Join Date: Apr 2017
Location: Vancouver, BC Canada
Posts: 469
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 148 Post(s)
Thanks: 2
Thanked 23 Times in 23 Posts
Groans: 2
Groaned at 0 Times in 0 Posts
Garage
iTrader: 0 reviews
Of course cylinder deactivatiion is only on '18 and '19 2.5 non-turbo's with automatics...

Cdn17Sport6MT
Vancouver, BC Canada
Cdn17Sport6MT is offline  
post #9 of 22 (permalink) Old 06-30-2019, 09:01 AM
Registered User
 
idrive's Avatar
 
Join Date: Apr 2018
Location: St George Utah
Posts: 628
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 295 Post(s)
Thanks: 64
Thanked 57 Times in 53 Posts
Groans: 6
Groaned at 10 Times in 10 Posts
Garage
iTrader: 0 reviews
I don't care which mfg. we're talking, I would never own a car with cylinder deactivation.

Never

The suggestion, while I'd bet money will never happen to have Mazda extend the warranty is a good one and the only thing that would help me sleep better at night.




.

2018 Signature - White Pearl - Chestnut
Build Thread:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
idrive is offline  
post #10 of 22 (permalink) Old 06-30-2019, 11:40 AM
GWL
Registered User
 
Join Date: Mar 2015
Posts: 255
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 85 Post(s)
Thanks: 8
Thanked 12 Times in 10 Posts
Groans: 1
Groaned at 1 Time in 1 Post
iTrader: 0 reviews
Quote:
Originally Posted by oblivioncth View Post
Man I can't find more info about this anywhere, those numbers return nothing on Google. To be fair though, it is only days old...

GWL is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza 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













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