I need assistance.

[n1mrod]

I believe you are not approaching this correctly. You must cease substituting components in the belief that it would resolve the issue. It is essential to revert to fundamental principles and begin troubleshooting.

The first step is to verify the compression. A basic static examination will suffice. Remove the spark plugs, insert the gauge, and record the readings. This is necessary because to the depletion of oil, and it is essential to verify that the rings are still adequately sealing for combustion. Insufficient compression will prevent it from operating. Conclusion of the narrative.

The subsequent topic is fuel. It is necessary to assess the pressure. Install a gauge into the gasoline rail and verify if it generates pressure. If pressure is increasing, it is not a fuel cutoff switch.

Verifying spark is rather straightforward.

Upon confirming the presence of spark, fuel, and compression, you may proceed to examine more components.

That is a first step. Although further tasks remain, this provides a robust foundation and will mitigate the financial depletion associated with the "parts cannon" approach.

A common misconception is that a cylinder misfire indicates ignition issues. The DME (i.e., engine control unit) determines "misfire" based on the data received from the crank position sensor (CKP).

In simple words, it operates as follows: The DME indicates a combustion event in cylinder #1. It demands gasoline and then ignites it at the set intervals, while monitoring the CKP sensor to see the crank's movement in reaction to the combustion event. If the CKP exhibits any unexpected behaviour (e.g., delayed triggering, insufficient strength, etc.), it will register a cylinder #1 misfire, since it perceives the combustion event as having not occurred as anticipated. It is unaware of the reasons; it only recognises that it did not perform as anticipated. Potential issues may include a coil, a plug, wiring, inadequate compression, defective valves, or insufficient fuel supply, among others. My 2009 model has misfires due to the exhaust port being obstructed by carbon deposits from oil combustion, resulting in inadequate exhaust and a diminished intake charge for the subsequent combustion cycle, which the DME detects as a misfire via the CKP sensor.

The misfire in cylinder "x" serves just as an indication of the underlying issue, rather than the definitive cause. To locate it, you must do troubleshooting.

Replacing a coil may eliminate the misfire, but this outcome might be coincidental, since the underlying issue may stem from other sources. If they reappear, it indicates a "hard fault" that requires attention.


Additionally, attempt to erase the codes in the DME and see whether they reappear upon the subsequent start attempt.