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Two rocker arms operate two intake valves. One falls off the shaft. Another one operates its valve in idle and low-power operation. Everything is cool and dandy. But when you request full power, it is nowhere to be found, because the second intake valve is closed shut.

I don't think so. He was on the highway, following the rig. Steady high-speed, low RPM situation. Cylinder deactivation must have been on before the ordeal happened.

I wholeheartedly thank you for this effort. Looks like the proverbial "don't lose your face" Japanese attitude. Rocker arm falling off completely, eh... If Mazda has registered in automotive scale of things, this would have been a scandal...

You can, in GM and Chrysler vehicles. I did just that in my Tahoe, which will not see 4-cyl mode untill I decide to despose of the rig. I haven't heard about Mazda solution yet. But I'm sure it's coming.

I still wonder how the engine runs fine in idle with dislodged rocker arm... And how the arm is allowed to slip on the shaft. Perhaps, that lateral movement is by design to shut the cylinder off by missing the valve. And increased oil pressure is supposed to bring it back over the valve. Ok, I...

By the way, I can't find that TSB on any of the sources I have access to yet. Maybe too new and hot. Well, there is one, CHECK ENGINE LIGHT ON WITH DTC P0524. It deals with the PCM programming where its oil pressure ramp-up is too slow under certain conditions. It is dated Oct 18, 2018.

Well, at least they didn't follow GM debacle step-by-step then. Still beats me how would the rocker be allowed to slip laterally. How would the engine run normally, even in idle, with intake valve shut all the way... That's a sloppy design for sure.

Yo, I was actually the first one to start the whole ordeal!

I'm sorry for your troubles and thank you for a good job getting to the bottom of it. Here we go, to the previous discussion about cylinder de-activation. All this nonsense for what, like 0.5 mph gain at the right conditions? I don't really follow their explanation about the rocker falling off...

Keep in mind that the tensioner is a simple spring-loaded type, not hydraulic. Take it off, pull the grommet. You'll see a simple spring, lubricated by an ounce of fluid, no dampener. If the pulley's bearing is fine, add some hydraulic oil in there, clean the grommet and put it back. The grommet...

New gasket, right? These codes are pesky sometimes, being interlaced...

Do you know what has been involved in this carbon clean procedure?

It takes a while to get from Japan to North America on boat. Have you seen how cars are stacked up on the carrier? Some sea salt definitely gets up there to the metal. Even if the ship does not encounter overly rough seas, salt is all over cars on and above the deck. Cars arrive at the port of...

That's quite a list for a good plan. I'm not sure how you're going to plan for the expense 10 years+ down the road. Are you putting money away for that now? Unless you invest at average market return, that's waste thanks to inflation. As for underbody rust, take care of it right away, if you...

Put a charger on your battery for few hours. It has nowhere to get needed energy otherwise. Or use better booster.

Best way to know what you need at certain mileage is to check owner's manual. That's the bible, not whatever dealer preaches...

...on their own cars.

No, no machine is necessary, but the one that supplies constant measured flow of the new ATF would be beneficial. As long as it supplies the same amount of fluid that is being expelled.

https://www.mazdas247.com/forum/showthread.php?123865252-ATF-flush-adapter That's one way to handle that. Kedis has pointed me to this aftermarket adapter...

BTW, how is your ATF flush adapter project going? I've made it, there's a thread with pictures. I intend to do the fluid exchange sometime in June.