Update:
I was able to scope one of the intake valve with cylinder inspection scope, take a look.
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manifold itself is clean
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The intake valve has carbon build up on them, it is expected of course(direct injection). This is not that severe or anything.
Note: this was after i ran cleaner through the intake, but i mean its prob not that bad in the first place.
Misfire is still there of course so i pulled coil and plugs after work.
take a look
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Coil are in excellent condition, so i did not take any pictures, i inspected cyl#3 plug in detail, as you can see it has no cracks and the gaps is consistant on all plugs so i see nothing wrong with it.
With everything removed, i went ahead and performed compression test, again i tested the result twice to make sure it was correct so here it is.
cyl#3
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cyl #4
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As you can see, cyl #3 only has 110 psi,comparing to cyl #4 which had 150 psi. it is lacking 40 psi of compression and yes i did compression test on all cylinders to verified.
This indicates possible valve seal or piston ring failure, it is unknown why this happened and again the dealership refuses to do anything and told me to monitor it and wait for CEL(check engine light).
I sort of did their job, but do i really want to tell them? it is their job to do diag and not mine. I will contact Mazda Canada regarding to this issue and i made yet another appointment with the dealership becuase the check engine light did come back last night.
At this point Im looking to trade this vehicle in since it is a lease(thank god to that), I Initially planned on buying this vehicle out but i guess not, yes i will lose some money and pay more on the next cx5, but is it worth it? going back and fourth with this dealership? have them telling me to monitor when the problem is clearly there? and only if they just plug in the comp and take a look at the datalist? honestly its not worth my time. On my day offs i like to spend them with the family ans not at service center for hours only yo tell me no fault found please monitor.
This concludes the story and my cx5 for now, I will be picking up a 2020 possibily next week or so, i still need to take off the trailer hitch, mud guards and hitch harness.
here is some pic of this beautiful beast
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