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What spark plugs are you running?

Leak down test will give more information as to why the cylinder is losing compression. I do not think this step is necessary to diagnose why the miss-fire is happening yet, especially if this may cost more money for the OP. Based on the information provided as well as my experience, I am going...

What was the last thing you did on your car prior to this problem? From your log, my observations tell me your ECU is pulling a ton of fuel and your system is reporting extremely rich when you let off the gas. Your system is responding to it, but the readings are extreme for the conditions...

It could be, but wouldn't it be in the OPs interest to confirm that prior to diagnosing it as a completely failed engine? I understand that the engine is in a poor condition, but it doesn't necessarily indicate the engine will have a severe miss.

I am curious to understand why cylinder 2 is being reported as missing but the compression is lower on cylinder 3. Something doesn't sound right. Although its not ideal, I have seen these engines run well enough even with the low compression numbers in 1 cylinder. OP reported severe missfire...

Those orings look like they took a beating... I recommend you clean the bores of the injector holes on the fuel rail. Those bores do corrode and create a rough surface, specifically if the car is winter driven in Canada. In addition, I have a spare injector harness, assuming you live in GTA.

We will do what we can to help you, but without data it makes it difficult for us to get a sense of what is happening. An O2 sensor can definitely cause the issues you are experiencing, do you know what the code number was?

While I appreciate your concern for the data, this is a known condition for fuel economy purposes. Knock at light load is OK, and at times intentional.

It could be fuel trims causing this behaviour. Do you have any way to monitor live data? (i.e. Cobb Accessport, live scanner, etc.) Are there any codes/ engine light on?

What are your modifications, what are your compression numbers?

@OP, that damage is quite severe, and It looks like you have a handful of power mods and a tune. How long have you been on the latest tune? Were the injectors you replaced the originals on your engine? Did you monitor data after injector swap to make sure there wasn't knock?

Hey, busy time in my life, I go missing at times. That is the connector. I was referring to disconnecting it from inside the car. You need to remove the plastic trims inside to get to it, but some cars are not accessible. I have not removed these on a Mazda 3 in the recent past, so I cant...

I was referring to the harness connector, but I may have been thinking of a different vehicle haha. I actually think you should attempt to disconnect the connector from inside the car without removing the plastic housing from the metal car frame.

A leak down test will help you identify a damaged ringland. Did you monitor your engine logs after injector replacement? Do a leakdown test on the engine. I expect leakage in cyl 3.

I am wondering if during your injector replacement operation, there was debris that fell into the cylinder? For reference, in the Protege, there was a TSB for the copper screws holding the VTCS flaps on getting into the engine. This often resulted in bent electrode tips. Considering your...

If your piston could reach you plugs, it would also reach your head. The bent plug tip is far more likely due to something going through your engine, like a bolt or debris. Does the rattling get worse if you increase RPM? Did you replace the plug? Did you inspect inside the cylinders?

Should be a connector on the rubber grommet. The release levers are on the top and bottom, hard to feel. I could be referring to the rear doors here, so maybe start with the rear doors as they are easier to access. and if possible, start with the doors that experienced the accidents.

You can try by removing F57 in the passenger junction box (fusebox) which is labeled alarm, but it may disable other functions, including ignition in your car. The door latch mechanisms in the door may be shorting due to water ingress. Car is older and if something isnt sealing right, the...

Thanks for the replies guys! My leak down test revealed that cylinder 1 has about 50% leakage and it looks like it is through the PCV system. All other cylinder are near perfect health. My research and guess would be a broken, seized or collapsed compression ring and/or ringland crack. I will...

Seems like there are various symptoms that can cause this. First thing is look at your fuel pressure when you experience the problem. I am also experiencing a similar issue, but have found several factors that change the severity of the problem. Aftermarket ignition coils make the problem...