Mazda CX9 Owners and Likers Thread

[Dr.Kamiya]

Two GR Corollas Burned Down. Toyota Won’t Honor the Warranties

Yup I've seen that.
In the dashcam video of one of the cars the driver was literally just crusing when it the engine went and the fire started. Seemed to be very new too he still had the plastic wrap on his back seats.

[dr. d]

Two GR Corollas Burned Down. Toyota Won’t Honor the Warranties

heh heh.
but i suppose,
if this gets out and is magnified by the media... and it begins to show in the sales charts...

[jojopad]

According to this forum thread, the likely culprit is the Ford designed defective Power Transfer Unit (PTU) in all CX-9 models from 2007-2015:

Basically the front transfer case (or Power Transfer Unit, PTU) is too close to the exhaust system and gets heated up more than usual. The gear lubricant inside gets deteriorated a lot faster and becomes sludge. In theory gear lubricant in front transfer case、rear differential、and manual transmission can be "life-time" lub under a suitable environment, hence Mazda and Ford don't specify any recommended maintenance interval for gear lubricant replacement and don't even bother to design a drain hole for it! But since the gear lub actually gets heat up so often, it causes problems and makes the front transfer case eventually failed due to sludge issue.

Taken from: Class-action lawsuit for CX-9 PTU? (Power Transfer Unit / Transfer Case) | Mazdas247

[jojopad]

Fireman POV of burning Mazda CX9 along Ortigas flyover

[hardwang]

According to this forum thread, the likely culprit is the Ford designed defective Power Transfer Unit (PTU) in all CX-9 models from 2007-2015:



Taken from: Class-action lawsuit for CX-9 PTU? (Power Transfer Unit / Transfer Case) | Mazdas247

Bruh, that's not even applicable for the same CX9 model that burned here.

[jojopad]

Bruh, that's not even applicable for the same CX9 model that burned here.

Curious, can you explain more why you don't think it's applicable for the CX9 model sold here at PH?

[Walter]

Ford-Mazda partnership ended in 2014-2015 ... agreeing with hardwang ... what does a 10 year old model have anything to with the current generation? ...

[Dr.Kamiya]

This one was caught in time. Fuel feed line ruptured daw.



Lots of ways for a car to burn down, especially turbos since stuff in the engine bay can get really hot especially the turbo itself and the manifolds. If one of the various oil or fuel lines ruptures you can be in for a bad time.

[Verbl Kint]

Fireman POV of burning Mazda CX9 along Ortigas flyover

Looking at the video, it seems the trunk and the engine bay of the CX-9 didn't get as cooked as the cockpit. This is in contrast to the image at the top of the page where the GR that caught fire had most of the fire damage in front of the car.

[hardwang]

Taken from carguide:
https://www.************/2018/04/rev...sport.html?m=1

"Apparently, the CX-9’s engine components are susceptible to heat soak, especially when driven at high speeds for an extended period of time (in this case, a steady 100-110 km/h for about 4 hours). Whether its due to the high ambient temperature or not, what matters is that the engine temperature rose steadily, resting at about three-quarters to red (110 degrees Celsius according to the gauge cluster)."

Could it be that its a just a matter of a shitty engine design? Guess I wouldn't be buying a Mazda with turbo now.

Edit: Crap the link won't work. Oh well. It's from carguide's CX9 review dated 2018.

[Motortrend]

Taken from carguide:
https://www.************/2018/04/rev...sport.html?m=1

"Apparently, the CX-9’s engine components are susceptible to heat soak, especially when driven at high speeds for an extended period of time (in this case, a steady 100-110 km/h for about 4 hours). Whether its due to the high ambient temperature or not, what matters is that the engine temperature rose steadily, resting at about three-quarters to red (110 degrees Celsius according to the gauge cluster)."

Could it be that its a just a matter of a shitty engine design? Guess I wouldn't be buying a Mazda with turbo now.

Edit: Crap the link won't work. Oh well. It's from carguide's CX9 review dated 2018.

I think it is because of carguide.

[jojopad]

Taken from carguide:
https://www.************/2018/04/rev...sport.html?m=1

"Apparently, the CX-9’s engine components are susceptible to heat soak, especially when driven at high speeds for an extended period of time (in this case, a steady 100-110 km/h for about 4 hours). Whether its due to the high ambient temperature or not, what matters is that the engine temperature rose steadily, resting at about three-quarters to red (110 degrees Celsius according to the gauge cluster)."

Could it be that its a just a matter of a shitty engine design? Guess I wouldn't be buying a Mazda with turbo now.

Edit: Crap the link won't work. Oh well. It's from carguide's CX9 review dated 2018.

I'll fix the link obfuscation for you:

https://www-carguide-ph/2018/04/revi...awd-sport.html

(copy the link, replace - from www-carguide-ph with .)

Let's quote the complete paragraph:

Having said that, not everything is rosy with Mazda’s first modern forced-induction motor. And for that, it’s time to go back to the opening paragraph. Apparently, the CX-9’s engine components are susceptible to heat soak, especially when driven at high speeds for an extended period of time (in this case, a steady 100-110 km/h for about 4 hours). Whether its due to the high ambient temperature or not, what matters is that the engine temperature rose steadily, resting at about three-quarters to red (110 degrees Celsius according to the gauge cluster). At this time, any jab of the throttle won’t produce any kick from the turbo. Instead, it’ll behave pretty much like a normally-aspirated engine lugging a 1,908-kilogram body. Additionally, fuel economy could be better. Despite all the hype surrounding this Dynamic Pressure Turbo, fuel economy in city traffic is stuck at 5.21 km/L improving to just 11.65 km/L during highway driving.

Looks like a specific issue with the CX9 only, not all Mazda Skyactiv engine models. And doesn't seem a likely culprit for an engine fire.

Could it be the CX9 Skyactiv model is still using the Ford PTU design? I can only speculate.

[hardwang]

I'll fix the link obfuscation for you:

https://www-carguide-ph/2018/04/revi...awd-sport.html

(copy the link, replace - from www-carguide-ph with .)

Let's quote the complete paragraph:



Looks like a specific issue with the CX9 only, not all Mazda Skyactiv engine models. And doesn't seem a likely culprit for an engine fire.

Could it be the CX9 Skyactiv model is still using the Ford PTU design? I can only speculate.

Same engine is used in the CX5 turbo and the phased out Mazda 6 Turbo. Dunno if there are reports of overheating in FB groups.

Highly doubt Ford is involved this time. They've long broken up. I believe the engineering from the ground up is pure Mazda.

[LOLZ]

Same engine is used in the CX5 turbo and the phased out Mazda 6 Turbo. Dunno if there are reports of overheating in FB groups.

Highly doubt Ford is involved this time. They've long broken up. I believe the engineering from the ground up is pure Mazda.

The drivetrain is shared with the CX-5 mostly as-is.
Mazda CX-9 - SAVAGEGEESE | TECHNICAL MISHAPS

I believe the CX-9 is the debut platform for the 2.5T and there were reports of cracking cylinder heads and coolant loss(also affected the 6 and CX-5) purportedly addressed in 2021 with a revised cylinder head.

2.5T Engine Coolant Leaking TSB | Mazdas247

There was also Oil consumption issues mostly with 2021 USA MY models due to defective valve stem seals.

Mazda 2.5 Turbo Valve Stem Seal information| Grassroots Motorsports forum |