How to Diagnose Misfire Codes 274E, 2742, and 2743 in a 2002 BMW 318i?

Hello and welcome to ExpertHelp.com! My name is [REDACTED NAME] and I'm going to do everything in my power to answer your question to your full satisfaction! I’m available to chat now. Please let me know that you are ready by posting a response. I’ll leave my chat session open for the next 15 minutes or so and wait for your reply. If I don’t catch you this time, please respond with a few times (including your timezone) that work best for you and we can connect then. --- Please allow me a few minutes to try to narrow down the issue. --- Blue smoke is a clear sign telling your car engine is burning oil. What happens is that the piston rings or the valve guide seals or other components of the engine are worn or broken, causing oil leaking. The oil will flow into the combustion chamber, then it is being burnt together with the fuel, creating blue smoke. --- I'm sorry to hear about the problems you have with your 318i. Let's see if we can figure this out and get you back on the road quickly. Is the CEL (check engine light) constantly on or blinking? The smoke out of the tailpipe indicates that the engine burns engine oil. Some condensation from the tailpipe is ok as the car was staying for that long. --- Also if possible check if the spark plugs are full of oil at this point. --- Good Day [REDACTED NAME], CEL light blinks. There is oil on the spark plugs 1 and 2. --- Please allow me a few minutes to resolve this for you. --- Thanks for the update. As the CEL is "blinking" it tells us that there is a "hard misfire." Can you check with a "spark tester" if the ignition system is working on cylinder 1 & 2? I assume that we won't have spark, this also explains the oil on the plugs. Did you replace the coils with OEM or aftermarket parts? --- I will test the ignition system on coil 1 and 2. No, I did not replace with OEM but I switched coil 1 and 2 with the original coils which were in the car (OEM) but same result. The idea of checking for spark sounds good. --- Quickly looked up the wiring diagram for the ignition system. The power supply for all the coils is the same, so we can rule this out. If there is no spark, as I suspect at this point, and we can rule out the ignition coils it would leave the wiring and engine control computer itself. As a further step inspect the wiring for a possible open, short or resistance in between. If everything checks out we have to take a look at the engine control computer itself for a possible water intrusion/damage. I'm sorry that you have to deal with this, I know it can be frustrating. --- Is there anything else I can help you with? --- I've very much enjoyed helping you with your BMW question. If you are satisfied with my assistance, please click the Accept Answer button below and follow the instructions on the next screen. By accepting my answer, I'll get paid for helping you. Rest assured you have up to 30 days to communicate with me after you accept my answer in the event you have any follow-up questions on this issue or the problem resurfaces for some reason. Accept Answer. Thanks for allowing us to help you!