Cylinder deactivation?
Member
Joined: Mar 2013
Posts: 61
Likes: 0
From: ABE area, Pa.
Not that this is your problem, but these are being recalled for a PCM flash update. Apparently the rocker arm inside the engine can fall off during certain conditions during 2 to 4 cylinder activation causing bad performance or stalling. Just so you're aware:
https://www.mazdas247.com/forum/show...5-and-6-models
https://www.mazdas247.com/forum/show...5-and-6-models
Senior Member
Joined: Oct 2017
Posts: 121
Likes: 0
From: United States
Update after 18 month ownership.
Can only deactivate with sport mode on which just changes the throttle sensitivity and moves the shift points to higher rpm. Driving around town at 3000 rpm is just stupid. However, ripping through the mountains is great - stays closer to the power band.
It also seems to deactivate above 80 kmh.
I still struggle driving through town with the deactivation and bitch about it each time I feel it. My dear wife doesn't feel the deactivation when she drives. But, she tends to stand on the accelerator.
I find a number of the electronic controls on the vehicle seem have been designed/coded by junior |IT people. It is like they only put in enough effort in so it works, but not very refined. Perhaps I'm being too sensitive - not manly enough. Honestly, I find it disappointing.
Overall, it is a good vehicle, but like any vehicle produced it has some limitations.
Can only deactivate with sport mode on which just changes the throttle sensitivity and moves the shift points to higher rpm. Driving around town at 3000 rpm is just stupid. However, ripping through the mountains is great - stays closer to the power band.
It also seems to deactivate above 80 kmh.
I still struggle driving through town with the deactivation and bitch about it each time I feel it. My dear wife doesn't feel the deactivation when she drives. But, she tends to stand on the accelerator.
I find a number of the electronic controls on the vehicle seem have been designed/coded by junior |IT people. It is like they only put in enough effort in so it works, but not very refined. Perhaps I'm being too sensitive - not manly enough. Honestly, I find it disappointing.
Overall, it is a good vehicle, but like any vehicle produced it has some limitations.
Senior Member
Joined: Jan 2018
Posts: 586
Likes: 0
From: United States
I am actually very happy with the city-driving performance of our non-turbo GT AWD and with the MPG value I get which is about 27-28 MPG with mixed city/highway driving. The acceleration from 0 mph to 40 mph is good enough for city traffic. But I agree that some planning is required because of the somewhat "slow" response going from 40 mph to 60 mph, for example when merging on a highway. On the other hand, I think I would still go with the non-turbo version because of the better MPG.
Senior Member
Joined: Oct 2017
Posts: 121
Likes: 0
From: United States
Not that this is your problem, but these are being recalled for a PCM flash update. Apparently the rocker arm inside the engine can fall off during certain conditions during 2 to 4 cylinder activation causing bad performance or stalling. Just so you're aware:
https://www.mazdas247.com/forum/show...5-and-6-models
https://www.mazdas247.com/forum/show...5-and-6-models
Senior Member
Joined: Jan 2018
Posts: 586
Likes: 0
From: United States
Why is Mazda NOT stating it in the CX-5 vehicle sticker? I received a recall notice on my 2019 CX-5 GT AWD (non-turbo)! I looked on the vehicle sticker and I don't see a thing about cylinder deactivation. I'd rather have a good naturally spirited engine than an engine that tries to save .5 mpg of gas by complicated cylinder de-activation. I heard that the 2019 CX-5 GT Reserve (turbo) does not have the cylinder de-activation - is this true?
Junior Member
Joined: Mar 2019
Posts: 12
Likes: 0
From: Ontario
Why is Mazda NOT stating it in the CX-5 vehicle sticker? I received a recall notice on my 2019 CX-5 GT AWD (non-turbo)! I looked on the vehicle sticker and I don't see a thing about cylinder deactivation. I'd rather have a good naturally spirited engine than an engine that tries to save .5 mpg of gas by complicated cylinder de-activation. I heard that the 2019 CX-5 GT Reserve (turbo) does not have the cylinder de-activation - is this true?
Wade
Last edited by Zig613; Aug 1, 2019 at 09:15 AM.
Senior Member
Joined: Oct 2017
Posts: 121
Likes: 0
From: United States
In Canada the vehicle sticker for the 2018 CX5 does state under "Engine/Mechanical Features" that the vehicle has "Cylinder Deactivation". I test drove the CX5 at two different dealerships and both salesman advised me of the feature. They used the feature as a selling point.
Wade
Wade
Junior Member
Joined: Mar 2019
Posts: 12
Likes: 0
From: Ontario
I have attached the snippet of the "Engine/Mechanical Features" from my 2019 Mazda CX-5 GT AWD (USA). As you can see, Mazda tried to hide the Cylinder Deactivation (CD) feature from the US version! Why? Anyway the dealer completed the re-programming of the PCM to prevent the rocker arm from falling. Is this a real fix? I am not optimistic about this so I'm trading it in with a 2019 CX-5 GT Reserve AWD. The reserve has a turbo engine and the tech said that Mazda turbo engine doesn't have the CD.
Wade
Senior Member
Joined: Jan 2018
Posts: 586
Likes: 0
From: United States
I have attached the snippet of the "Engine/Mechanical Features" from my 2019 Mazda CX-5 GT AWD (USA). As you can see, Mazda tried to hide the Cylinder Deactivation (CD) feature from the US version! Why? Anyway the dealer completed the re-programming of the PCM to prevent the rocker arm from falling. Is this a real fix? I am not optimistic about this so I'm trading it in with a 2019 CX-5 GT Reserve AWD. The reserve has a turbo engine and the tech said that Mazda turbo engine doesn't have the CD.
I also posted the content here:
ENGINE
Engine type SKYACTIV®-G1 2.5L DOHC 16-valve 4-cylinder with Cylinder Deactivation
Horsepower 187 hp @ 6,000 rpm
Torque 186 lb-ft @ 4,000 rpm
Redline 6,500 rpm
Displacement (cc) 2488
Bore x stroke (mm) 89 x 100
Compression ratio 13.0 : 1
Fuel system Advanced Direct Injection
Recommended fuel Regular unleaded
Valvetrain Chain-driven dual overhead cams, 4-valves per cylinder with variable valve timing (VVT)
Ignition system Direct coil-on-plug electronic ignition with platinum-tipped spark plugs
Engine block Aluminum alloy
Cylinder head Aluminum alloy
Emission control type (Fed/Cal) T3B30/SULEV30
SKYACTIV-VEHICLE DYNAMICS with G-Vectoring Control Plus
Senior Member
Joined: Oct 2017
Posts: 121
Likes: 0
From: United States
I would not say they tried to hide since they put it on the mazdausa website in the engine specifications: Look under Engine & Mechanical at https://www.mazdausa.com/vehicles/cx-5/specs
I also posted the content here:
ENGINE
Engine type SKYACTIV®-G1 2.5L DOHC 16-valve 4-cylinder with Cylinder Deactivation
Horsepower 187 hp @ 6,000 rpm
Torque 186 lb-ft @ 4,000 rpm
Redline 6,500 rpm
Displacement (cc) 2488
Bore x stroke (mm) 89 x 100
Compression ratio 13.0 : 1
Fuel system Advanced Direct Injection
Recommended fuel Regular unleaded
Valvetrain Chain-driven dual overhead cams, 4-valves per cylinder with variable valve timing (VVT)
Ignition system Direct coil-on-plug electronic ignition with platinum-tipped spark plugs
Engine block Aluminum alloy
Cylinder head Aluminum alloy
Emission control type (Fed/Cal) T3B30/SULEV30
SKYACTIV-VEHICLE DYNAMICS with G-Vectoring Control Plus
I also posted the content here:
ENGINE
Engine type SKYACTIV®-G1 2.5L DOHC 16-valve 4-cylinder with Cylinder Deactivation
Horsepower 187 hp @ 6,000 rpm
Torque 186 lb-ft @ 4,000 rpm
Redline 6,500 rpm
Displacement (cc) 2488
Bore x stroke (mm) 89 x 100
Compression ratio 13.0 : 1
Fuel system Advanced Direct Injection
Recommended fuel Regular unleaded
Valvetrain Chain-driven dual overhead cams, 4-valves per cylinder with variable valve timing (VVT)
Ignition system Direct coil-on-plug electronic ignition with platinum-tipped spark plugs
Engine block Aluminum alloy
Cylinder head Aluminum alloy
Emission control type (Fed/Cal) T3B30/SULEV30
SKYACTIV-VEHICLE DYNAMICS with G-Vectoring Control Plus
Has anyone noticed the increase in power on sudden acceleration from stop light or merging/passing on the expressway after the recall was completed? I feel it on my CX-5! So I have changed my mind on replacing this with a GT turbo.