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From what they told me, you are correct on the lowering of pressure to release the latch pin, but it still maintains some pressure on the lifter as to not totally drop out. If this pressure is too low, the lifter will fall too far and present a gap between itself and the rocker. This is just...

If you bought the grand touring reserve or signature model then you have the turbo and no cylinder deactivation. All other models do

Its good that they reflashed your PCM. But, I would bet a lot of money that your trouble is beyond that. You coded a misfire on cylinder 4. Exactly as mine did. This is due to a missing rocker arm and only one of two intake valve stroking. You car will run fine at lower rpms because it is...

Its sounds strange, but the rocker arm is not attached to anyrhing in this engine. It is *pinched* between the cam and the lifter at one end and the valve stem at the other. Any slop on either end allows for the cam lobe to peel the rocker arm off and throw it down.

This is exactly right. Now you understand what I am saying.

Please, if you have one of these vehicles 2018 cx-5 or Mazda 6, your car has cylinder deactivation and you need to take it in and have them remove the valve cover and visually inspect to make sure all is well. And demand they reflash your PCM! The 2019s also have cylinder dactivation unless you...

Exactly yugrus!

It during cylinder deactivation that the rocker arm falls off. So once that rocker arm is off you have a serious situation that you have no indiction of. A few days later you may be driving and need to pass a vehicle. At this point you accelerate and the RPMs hit about 5000 and all of a sudden...

Unfortunately we can*t on these vehicles. I asked them about that when they put the new engine in my car.

The rocker arm literally falls off. It was laying down by the valve port. The engine runs fine during idle and lower RPMs due to the fact that it has four valves per cylinder. The computer only senses a problem at higher revs. At this point it senses a lean situation on #4 cylinder (in my...

The rocker arm is dislodged by the cam lobe due to low oil pressure on the lifter. This low pressure allows for slop of the rocker arm. So, your assumption is correct about the oil pressure. My dealership showed me the pictures of the rocker arm out of its position.

My car was in the shop in November 2018. It was during one of my many trips to the dealership back then that the service manager showed me a technical bulletin that they had just received concerning this situation. I am sorry but I have no idea what the number of the bulletin is or was.

The rocker arm is dislodged by the cam lobe due to low oil pressure on the lifter. This low pressure allows for slop of the rocker arm. My dealership showed me the pictures of the rocker arm out of its position.

Take you car in ASAP if you have not done so already. This is a known problem. Chances are you have a rocker arm that has fallen off of Cylinder #4 caused by the cylinder deactivation system at some point. Read my post *dangerous cylinder deactivation problem on 2018 CX-5 and 6 models*. This...

This is a long read but hopefully it will get the attention of the right people and quite possibly save a life. My wife and I own a 2018 Mazda CX-5 Grand Touring. We purchased the vehicle to replace our 2014 Mazda 6 GT. Being the proud Grandparents of two beautiful little girls, we wanted a...