Today, while driving my 2007 Cooper S (automatic), I encountered a significant incline that stretched for around one mile. I was travelling at a speed of approximately 55-60 miles per hour. Approximately one-fourth into the ascent, I detect an anomaly, like a failed attempt by the gearbox to change gears. Subsequently, at around the midpoint of the incline, the engine began experiencing vibrations and decelerating.
I successfully ascended the hill and proceeded to go a few further kilometres till I reached a petrol station. The engine operated well until when I engaged 6th gear in manual mode, at which point it would resume shaking. Upon arriving at the petrol station and coming to a halt, the engine exhibited significant trembling.
Fortuitously, I had my diagnostic tool readily available in the rear compartment. Consequently, I connected it and retrieved the following error codes:
The following diagnostic trouble codes (DTCs) have been detected: - 2A56: Oxygen Sensor Heating After Catalyst (CAT) Function - 2777: Combustion Misfire in Cylinder 3 - 2D52: Digital Motor Electronics (DME) Super Knocking 2DCD - Fuel Shutoff Caused by Excessive Knocking in Cylinder 3 2781 - Multiple Cylinder Misfire During Combustion
2771 - Cylinder 1 experiencing combustion misfire. 2775 - Cylinder 3 experiencing combustion misfire. 277D - Cylinder 2 experiencing combustion misfire.
I reset the error codes, adjusted the scanner settings to display misfires for each individual cylinder, started the engine, and promptly saw misfiring, mostly occurring in cylinder 2, but cylinders 1 and 4 were also affected.
After a period of contemplation, I decided to transport it back to my residence by driving.
When I analysed the data using the scanner, I saw that there was no misfire occurring over 3,200 rpm. However, when the engine speed dropped below this threshold, cylinder 4 exhibited severe misfiring. Additionally, while the vehicle was moving at a very slow pace, all cylinders were experiencing a significant level of misfiring.
Upon arriving home, I reexamined the codes and found that they merely displayed the following:
2781 - Multiple cylinders experiencing combustion misfire.
Error code 2775 indicates a combustion misfire in cylinder 3.
The diagnostic trouble codes are as follows: 2771 - Cylinder 1 combustion misfire 277D - Cylinder 2 combustion misfire
I have not conducted any inquiry beyond examining the codes. I am completely clueless on where to begin. Possible causes might include timing issues, compression issues, valve issues, and so forth.
Any guidance would be much appreciated. Thank you!