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I am still experiencing a misfire with my vehicle.

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Since purchasing the 2009 Mini Cooper non-turbo, I have been experiencing a misfire in cylinder 3.

I have altered.
Every every coil.
Every every spark plug.
Both variable valve timing (VVT) solenoids.
Both cam sensors were affected.
Two fuel injectors are needed for cylinders 2 and 3.
Sealing gasket for a valve cover.
Apologies, but I'm not sure what "Pcv." means. Could you please provide more context or clarify your message?
Thermostat and housing.
Comprehensive assistance
Currently, there is no gasoline filter in place.
Recently acquired AGM battery.

The chain was replaced 30,000 miles ago.
The compression test was conducted twice two weeks ago, and all results were within the acceptable ranges.

I always have my Veepeak OBD2 device plugged in, and I just acquired a Creator C501. When I connect the c501, it fails to scan any codes, unlike the veepeak which is able to do so. Am I making an error in my procedure?

Furthermore, it indicates the presence of a misfire in cylinder 3.
Based on my observations, there are air flow problems specifically in cylinder 3/4.

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Initial test to check the basic functionality of a system or software. The most probable cause of the issue is the leakage of valve seats, which is an often seen occurrence.

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Valve seats may get detached in naturally aspirated (NA) engines. This may be verified by doing a test, since it has a very distinctive attribute. Typically, the misfire becomes noticeable while the engine is running at its normal temperature and is not under load. When the camshaft sensor is removed, the ECU switches to safe mode, which disables the variable valve lift. This prevents the valves from making contact with the valve seats, ensuring a tight seal and preventing any leaks. However, if you continue to use it in that manner for an extended period of time, the seats will finally detach.

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Valve stem oil seals may experience leakage, leading to the accumulation of carbon deposits. The seats themselves should be satisfactory. However, it is necessary to remove the valves, clean them, and then reseat them.

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I have primarily observed this phenomenon in engines that have been overheated or are running very lean. In most cases of overheated cars, the seats in the cylinder head have dropped out. At this point, the decision arises whether to take the risk of installing new seats only to discover that the head is cracked. I have encountered this situation a couple of times, and the second time I concluded that it is more prudent to replace the head when overheating causes the seats to drop out, as it eliminates the risk and provides a better way forward.

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